From patchwork Sat Oct 24 10:51:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 11854789 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 837156A2 for ; Sat, 24 Oct 2020 10:51:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CB5224650 for ; Sat, 24 Oct 2020 10:51:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rrZ3j3y1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761074AbgJXKvW (ORCPT ); Sat, 24 Oct 2020 06:51:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761072AbgJXKvV (ORCPT ); Sat, 24 Oct 2020 06:51:21 -0400 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C710EC0613D2; Sat, 24 Oct 2020 03:51:20 -0700 (PDT) Received: by mail-wr1-x431.google.com with SMTP id y12so5401286wrp.6; Sat, 24 Oct 2020 03:51:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=M7Vqgqp5RCTym5rMfv9j6RqUwYhfreT6N/fOFNGIusQ=; b=rrZ3j3y190qnewJxPY2kJ+oCMGra/jto2aa+jOaGvrcU6L+UrykEAiNhv5flz2HIC5 /tuiI0L0OYa3x5W6O6oMCRIzasXMlUDqGEztkjjUKkPnQqIVFmphswT5llVZhVbffDFj 8h9QrrsZPBjK5Y/xGs5LiWzm+3UQvem1M48pJTusnYhH0COQJ5nQuklC6aDgF+3utJVu FfRdIFc3REClhUok4c347ZfGPAjofbVFV1UBWz7XiX8FUN1tqr/yx94cOS3q5yiCsgsp 9/TtDL6/hS5JX0hxWk7x2zJTiqxXnKgjM+M8qF3LDS0+wMkXeWU1SCDhyVn1p46zXEZI OCZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=M7Vqgqp5RCTym5rMfv9j6RqUwYhfreT6N/fOFNGIusQ=; b=P3BJ7NsC2d416+o5HjHIhWTByZryTmMl0/Vs/wTzSRQCPHu+kYTl17cuvVstr14kpA Gx/GQb30Lczm6CPPiLy+FaUlJ1ODZe1oA/6P5+VrRVzQR5zzf107zS6mNKlGhKocU7/v 4qWgdSQCeNxzaXH+TOx1qaiC7a/dzkvz+5xWA1LnQRCFmWNxcm/KKl6n6rSR/KWLtqgn BBe1EokWy2NQl8uyYyvDbbiVqlJl6cJnOXwZZcgSQxpIQ3zFVENeRKKRLFCGKoeYULTW c2fGjvZ46pLyhS8iM+OISzZpCUlUZqMVOk37yk7Ses+3Y99PkM2OQcazkrE+OuQfG/I8 5Zgw== X-Gm-Message-State: AOAM530VdaeXtc9HSc51e4Xaz6Q7avDtvmetXQd2R9i4ft46KjZeMvw8 v0X2adjs8Oaao2BBSSARHlg= X-Google-Smtp-Source: ABdhPJz71qU7Nz31JlLFaaQZDQJ95/cdp2uH9/LmsIFUT+dTNzfXB3bB1Qbjes2Qp5XQC5hyk7mjIw== X-Received: by 2002:adf:fd09:: with SMTP id e9mr7232776wrr.241.1603536678930; Sat, 24 Oct 2020 03:51:18 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu ([2.237.20.237]) by smtp.gmail.com with ESMTPSA id 3sm8792632wmd.19.2020.10.24.03.51.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Oct 2020 03:51:18 -0700 (PDT) From: kholk11@gmail.com To: dmitry.torokhov@gmail.com Cc: robh+dt@kernel.org, rydberg@bitmath.org, priv.luk@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, kholk11@gmail.com, marijns95@gmail.com, konradybcio@gmail.com, martin.botka1@gmail.com, phone-devel@vger.kernel.org, devicetree@vger.kernel.org, krzk@kernel.org, andy.shevchenko@gmail.com, Rob Herring Subject: [PATCH v7 1/3] dt-bindings: Add vendor prefix for Novatek Microelectronics Corp. Date: Sat, 24 Oct 2020 12:51:09 +0200 Message-Id: <20201024105111.15829-2-kholk11@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201024105111.15829-1-kholk11@gmail.com> References: <20201024105111.15829-1-kholk11@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: AngeloGioacchino Del Regno Add prefix for Novatek Microelectronics Corp. Signed-off-by: AngeloGioacchino Del Regno Acked-by: Rob Herring --- Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml index 66e45112a8d7..f98ea0af487d 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml @@ -740,6 +740,8 @@ patternProperties: description: Nokia "^nordic,.*": description: Nordic Semiconductor + "^novatek,.*": + description: Novatek Microelectronics Corp. "^novtech,.*": description: NovTech, Inc. "^nutsboard,.*": From patchwork Sat Oct 24 10:51:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 11854791 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 30AF0157C for ; Sat, 24 Oct 2020 10:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06A302463D for ; Sat, 24 Oct 2020 10:51:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="o1LDKt1P" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761086AbgJXKv0 (ORCPT ); Sat, 24 Oct 2020 06:51:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761080AbgJXKvW (ORCPT ); Sat, 24 Oct 2020 06:51:22 -0400 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FE1FC0613D2; Sat, 24 Oct 2020 03:51:22 -0700 (PDT) Received: by mail-wm1-x342.google.com with SMTP id k21so2695825wmi.1; Sat, 24 Oct 2020 03:51:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=0BerrGz1UCkt3jfZZl1gh/v8mx5F5YH0VfpQoA2pAEs=; b=o1LDKt1PweckDCVjrO0OAvP5YASijtK+moPAJhao+hoE1AYT1eSOnGz0J3d/dVieXG r96K/vcI/Q5uaJ6nFPN8s8gZCMe6jQPVevHpqm7pOUcdLGQRnnpkPdSNAJG1eBYNCB9S oxFBnGT8mm8KN2K6AJL1oZF4RR/H0SVbSTWIPfHa4f+VJsqnUjLieAKCj/wqh7ZA2VXg yw0eYdhiiwVmE/IzS/UYNuDTlp6kVh9y9XXR2pdUYng6qCYTmKjjIsSqepGgr+769RCx zcFGizUqs6dpo8+16iytHk4csnppNhtdMCYMRmGAmyVjtaXg486FZjUJxpGnoEKHQETE n0Gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=0BerrGz1UCkt3jfZZl1gh/v8mx5F5YH0VfpQoA2pAEs=; b=AqoiLWrfP6wDeI9PHq7CRRSWO6q6weenVDR947Q1kZq62lVa5nPVhq6DChbmk9bM4U FudNTAj8SiqUodxq0v9gsJvMPzETvTerusyXwT1yUxsH85c7Sh669s7kUY8UGIxeGXaa GfQdc37PL3uYuZ5WccJWDkm5ETCiBGJyrjD+rqcAM9Gdmp/o49UzhyoNEU1iLiY8AlLE FiTWwEePdZWiwz/sJksKSOnjuMNe84yU3/pif+jIhz3CfnOE/Vj3uFXEesZ9tfEvwUDx VGAssowWd1yiOONMhEdDUb9yQSgF+9cVbX19sq7TuEf2MMUIrG2nbIcZm4H+mB30CypC 5m3A== X-Gm-Message-State: AOAM530V0UsNEr+ySXzE896n0RS91s+fg4WZsRqK98DY4h9HtcsZAx5b PQmq99+hA1/LqZvoNRyWIBE= X-Google-Smtp-Source: ABdhPJxqvGNmC60vHIu229iNJQ0ZzyEP/K2Z8OMBiJ+9mC4fxWff5KQIa0qZen+SSRCfJ0mz4ngMbg== X-Received: by 2002:a1c:e1d7:: with SMTP id y206mr6375440wmg.48.1603536680626; Sat, 24 Oct 2020 03:51:20 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu ([2.237.20.237]) by smtp.gmail.com with ESMTPSA id 3sm8792632wmd.19.2020.10.24.03.51.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Oct 2020 03:51:20 -0700 (PDT) From: kholk11@gmail.com To: dmitry.torokhov@gmail.com Cc: robh+dt@kernel.org, rydberg@bitmath.org, priv.luk@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, kholk11@gmail.com, marijns95@gmail.com, konradybcio@gmail.com, martin.botka1@gmail.com, phone-devel@vger.kernel.org, devicetree@vger.kernel.org, krzk@kernel.org, andy.shevchenko@gmail.com Subject: [PATCH v7 2/3] Input: Add Novatek NT36xxx touchscreen driver Date: Sat, 24 Oct 2020 12:51:10 +0200 Message-Id: <20201024105111.15829-3-kholk11@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201024105111.15829-1-kholk11@gmail.com> References: <20201024105111.15829-1-kholk11@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: AngeloGioacchino Del Regno This is a driver for the Novatek in-cell touch controller and supports various chips from the NT36xxx family, currently including NT36525, NT36672A, NT36676F, NT36772 and NT36870. Functionality like wake gestures and firmware flashing is not included: I am not aware of any of these DrIC+Touch combo chips not including a non-volatile memory and it should be highly unlikely to find one, since the touch firmware is embedded into the DriverIC one, which is obviously necessary to drive the display unit. However, the necessary address for the firmware update procedure was included into the address table in this driver so, in the event that someone finds the need to implement it for a reason or another, it will be pretty straightforward to. This driver is lightly based on the downstream implementation [1]. [1] https://github.com/Rasenkai/caf-tsoft-Novatek-nt36xxx Signed-off-by: AngeloGioacchino Del Regno --- drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/nt36xxx.c | 895 ++++++++++++++++++++++++++++ 3 files changed, 908 insertions(+) create mode 100644 drivers/input/touchscreen/nt36xxx.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 35c867b2d9a7..6d118b967021 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -605,6 +605,18 @@ config TOUCHSCREEN_MTOUCH To compile this driver as a module, choose M here: the module will be called mtouch. +config TOUCHSCREEN_NT36XXX + tristate "Novatek NT36XXX In-Cell I2C touchscreen controller" + depends on I2C + help + Say Y here if you have a Novatek NT36xxx series In-Cell + touchscreen connected to your system over I2C. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called nt36xxx. + config TOUCHSCREEN_IMX6UL_TSC tristate "Freescale i.MX6UL touchscreen controller" depends on (OF && GPIOLIB) || COMPILE_TEST diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 30d1e1b42492..424a555e03d5 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o obj-$(CONFIG_TOUCHSCREEN_MMS114) += mms114.o obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o +obj-$(CONFIG_TOUCHSCREEN_NT36XXX) += nt36xxx.o obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO) += ipaq-micro-ts.o diff --git a/drivers/input/touchscreen/nt36xxx.c b/drivers/input/touchscreen/nt36xxx.c new file mode 100644 index 000000000000..cd37b1ab1cf5 --- /dev/null +++ b/drivers/input/touchscreen/nt36xxx.c @@ -0,0 +1,895 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Novatek NT36xxx series touchscreens + * + * Copyright (C) 2010 - 2017 Novatek, Inc. + * Copyright (C) 2020 AngeloGioacchino Del Regno + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* FW Param address */ +#define NT36XXX_FW_ADDR 0x01 + +/* Number of bytes for chip identification */ +#define NT36XXX_ID_LEN_MAX 6 + +/* Touch info */ +#define TOUCH_DEFAULT_MAX_WIDTH 1080 +#define TOUCH_DEFAULT_MAX_HEIGHT 2246 +#define TOUCH_MAX_FINGER_NUM 10 +#define TOUCH_MAX_PRESSURE 1000 + +/* Point data length */ +#define POINT_DATA_LEN 65 + +/* Global pages */ +#define NT36XXX_PAGE_CHIP_INFO 0x0001f64e +#define NT36XXX_PAGE_CRC 0x0003f135 + +/* Misc */ +#define NT36XXX_NUM_SUPPLIES 2 +#define NT36XXX_MAX_RETRIES 5 +#define NT36XXX_MAX_FW_RST_RETRY 50 + +struct nt36xxx_abs_object { + u16 x; + u16 y; + u16 z; + u8 tm; +}; + +struct nt36xxx_fw_info { + u8 fw_ver; + u8 x_num; + u8 y_num; + u8 max_buttons; + u16 abs_x_max; + u16 abs_y_max; + u16 nvt_pid; +}; + +struct nt36xxx_mem_map { + u32 evtbuf_addr; + u32 pipe0_addr; + u32 pipe1_addr; + u32 flash_csum_addr; + u32 flash_data_addr; +}; + +struct nt36xxx_i2c { + struct i2c_client *hw_client; + struct i2c_client *fw_client; + struct regmap *regmap; + struct regmap *fw_regmap; + struct input_dev *input; + struct regulator_bulk_data *supplies; + struct gpio_desc *reset_gpio; + + struct mutex lock; + + struct touchscreen_properties prop; + struct nt36xxx_fw_info fw_info; + struct nt36xxx_abs_object abs_obj; + + const struct nt36xxx_mem_map *mmap; +}; + +enum nt36xxx_chips { + NT36525_IC = 0, + NT36672A_IC, + NT36676F_IC, + NT36772_IC, + NT36870_IC, + NTMAX_IC, +}; + +struct nt36xxx_trim_table { + u8 id[NT36XXX_ID_LEN_MAX]; + u8 mask[NT36XXX_ID_LEN_MAX]; + enum nt36xxx_chips mapid; +}; + +enum nt36xxx_cmds { + NT36XXX_CMD_ENTER_SLEEP = 0x11, + NT36XXX_CMD_ENTER_WKUP_GESTURE = 0x13, + NT36XXX_CMD_UNLOCK = 0x35, + NT36XXX_CMD_BOOTLOADER_RESET = 0x69, + NT36XXX_CMD_SW_RESET = 0xa5, + NT36XXX_CMD_SET_PAGE = 0xff, +}; + +/** + * enum nt36xxx_fw_state - Firmware state + * @NT36XXX_STATE_INIT: IC Reset + * @NT36XXX_STATE_REK: ReK baseline + * @NT36XXX_STATE_REK_FINISH: Baseline is ready + * @NT36XXX_STATE_NORMAL_RUN: Firmware is running + */ +enum nt36xxx_fw_state { + NT36XXX_STATE_INIT = 0xa0, + NT36XXX_STATE_REK, + NT36XXX_STATE_REK_FINISH, + NT36XXX_STATE_NORMAL_RUN, + NT36XXX_STATE_MAX = 0xaf +}; + +enum nt36xxx_i2c_events { + NT36XXX_EVT_REPORT = 0x00, + NT36XXX_EVT_CRC = 0x35, + NT36XXX_EVT_CHIPID = 0x4e, + NT36XXX_EVT_HOST_CMD = 0x50, + NT36XXX_EVT_HS_OR_SUBCMD = 0x51, /* Handshake or subcommand byte */ + NT36XXX_EVT_RESET_COMPLETE = 0x60, + NT36XXX_EVT_FWINFO = 0x78, + NT36XXX_EVT_PROJECTID = 0x9a, +}; + +static const struct nt36xxx_mem_map nt36xxx_memory_maps[] = { + [NT36525_IC] = { 0x11a00, 0x10000, 0x12000, 0x14000, 0x14002 }, + [NT36672A_IC] = { 0x21c00, 0x20000, 0x23000, 0x24000, 0x24002 }, + [NT36676F_IC] = { 0x11a00, 0x10000, 0x12000, 0x14000, 0x14002 }, + [NT36772_IC] = { 0x11e00, 0x10000, 0x12000, 0x14000, 0x14002 }, + [NT36870_IC] = { 0x25000, 0x20000, 0x23000, 0x24000, 0x24002 }, +}; + +static const struct nt36xxx_trim_table trim_id_table[] = { + { + .id = { 0x0A, 0xFF, 0xFF, 0x72, 0x66, 0x03 }, + .mask = { 1, 0, 0, 1, 1, 1 }, + .mapid = NT36672A_IC, + }, + { + .id = { 0x55, 0x00, 0xFF, 0x00, 0x00, 0x00 }, + .mask = { 1, 1, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0x55, 0x72, 0xFF, 0x00, 0x00, 0x00 }, + .mask = { 1, 1, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xAA, 0x00, 0xFF, 0x00, 0x00, 0x00 }, + .mask = { 1, 1, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xAA, 0x72, 0xFF, 0x00, 0x00, 0x00 }, + .mask = { 1, 1, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x72, 0x67, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x70, 0x66, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x70, 0x67, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x72, 0x66, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x25, 0x65, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x70, 0x68, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36772_IC, + }, + { + .id = { 0xFF, 0xFF, 0xFF, 0x76, 0x66, 0x03 }, + .mask = { 0, 0, 0, 1, 1, 1 }, + .mapid = NT36676F_IC, + }, +}; + +/** + * nt36xxx_set_page - Set page number for read/write + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_set_page(struct nt36xxx_i2c *ts, u32 pageaddr) +{ + u32 data = cpu_to_be32(pageaddr) >> 8; + int ret; + + ret = regmap_noinc_write(ts->fw_regmap, NT36XXX_CMD_SET_PAGE, + &data, sizeof(data)); + if (ret) + return ret; + + usleep_range(100, 200); + return ret; +} + +/** + * nt36xxx_sw_reset_idle - Warm restart the firmware + * @ts: Main driver structure + * + * This function restarts the running firmware without rebooting to + * the bootloader (warm restart) + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_sw_reset_idle(struct nt36xxx_i2c *ts) +{ + int ret; + + ret = regmap_write(ts->regmap, ts->hw_client->addr, + NT36XXX_CMD_SW_RESET); + if (ret) + return ret; + + /* Wait until the MCU resets the fw state */ + usleep_range(15000, 16000); + return ret; +} + +/** + * nt36xxx_bootloader_reset - Reset MCU to bootloader + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_bootloader_reset(struct nt36xxx_i2c *ts) +{ + int ret; + + ret = regmap_write(ts->regmap, ts->hw_client->addr, + NT36XXX_CMD_BOOTLOADER_RESET); + if (ret) + return ret; + + /* MCU has to reboot from bootloader: this is the typical boot time */ + msleep(35); + return ret; +} + +/** + * nt36xxx_check_reset_state - Check the boot state during reset + * @ts: Main driver structure + * @fw_state: Enumeration containing firmware states + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_check_reset_state(struct nt36xxx_i2c *ts, + enum nt36xxx_fw_state fw_state) +{ + u8 buf[2] = { 0 }; + int ret, retry = NT36XXX_MAX_FW_RST_RETRY; + + do { + ret = regmap_noinc_read(ts->fw_regmap, + NT36XXX_EVT_RESET_COMPLETE, + buf, sizeof(buf)); + if (likely(ret == 0) && + (buf[0] >= fw_state) && + (buf[0] <= NT36XXX_STATE_MAX)) { + ret = 0; + break; + } + usleep_range(10000, 11000); + } while (--retry); + + if (!retry) { + dev_err(&ts->hw_client->dev, "Firmware reset failed.\n"); + ret = -EBUSY; + } + + return ret; +} + +/** + * nt36xxx_read_pid - Read Novatek Project ID + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_read_pid(struct nt36xxx_i2c *ts) +{ + __be16 pid; + int ret; + + ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr); + if (ret) + return ret; + + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_PROJECTID, + &pid, sizeof(pid)); + if (ret < 0) + return ret; + + ts->fw_info.nvt_pid = be16_to_cpu(pid); + return 0; +} + +/** + * __nt36xxx_get_fw_info - Get working params from firmware + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static int __nt36xxx_get_fw_info(struct nt36xxx_i2c *ts) +{ + struct nt36xxx_fw_info *fwi = &ts->fw_info; + u8 buf[11] = { 0 }; + int ret = 0; + + ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr); + if (ret) + return ret; + + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_FWINFO, + buf, sizeof(buf)); + if (ret) + return ret; + + fwi->fw_ver = buf[0]; + fwi->x_num = buf[2]; + fwi->y_num = buf[3]; + fwi->abs_x_max = get_unaligned_be16(&buf[4]); + fwi->abs_y_max = get_unaligned_be16(&buf[6]); + fwi->max_buttons = buf[10]; + + /* Check fw info integrity and clear x_num, y_num if broken */ + if ((buf[0] + buf[1]) != 0xFF) { + dev_err(&ts->hw_client->dev, + "FW info is broken! fw_ver=0x%02X, ~fw_ver=0x%02X\n", + buf[0], buf[1]); + fwi->fw_ver = 0; + fwi->x_num = 18; + fwi->y_num = 32; + fwi->abs_x_max = TOUCH_DEFAULT_MAX_WIDTH; + fwi->abs_y_max = TOUCH_DEFAULT_MAX_HEIGHT; + fwi->max_buttons = 0; + return -EINVAL; + } + + /* Get Novatek ProjectID */ + return nt36xxx_read_pid(ts); +} + +static int nt36xxx_get_fw_info(struct nt36xxx_i2c *ts) +{ + struct nt36xxx_fw_info *fwi = &ts->fw_info; + int i, ret = 0; + + for (i = 0; i < NT36XXX_MAX_RETRIES; i++) { + ret = __nt36xxx_get_fw_info(ts); + if (ret == 0) + break; + } + + dev_dbg(&ts->hw_client->dev, + "FW Info: PID=0x%x, ver=0x%x res=%ux%u max=%ux%u buttons=%u", + fwi->nvt_pid, fwi->fw_ver, fwi->x_num, fwi->y_num, + fwi->abs_x_max, fwi->abs_y_max, fwi->max_buttons); + + return ret; +} + +/** + * nt36xxx_report - Report touch events + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static void nt36xxx_report(struct nt36xxx_i2c *ts) +{ + struct nt36xxx_abs_object *obj = &ts->abs_obj; + struct input_dev *input = ts->input; + u8 input_id = 0; + u8 point[POINT_DATA_LEN + 1] = { 0 }; + unsigned int ppos = 0; + int i, ret, finger_cnt = 0; + + mutex_lock(&ts->lock); + + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_REPORT, + point, sizeof(point)); + if (ret < 0) { + dev_err(&ts->hw_client->dev, + "Cannot read touch point data: %d\n", ret); + goto xfer_error; + } + + for (i = 0; i < TOUCH_MAX_FINGER_NUM; i++) { + ppos = 6 * i; + input_id = point[ppos + 0] >> 3; + if ((input_id == 0) || (input_id > TOUCH_MAX_FINGER_NUM)) + continue; + + if (((point[ppos] & 0x07) == 0x01) || + ((point[ppos] & 0x07) == 0x02)) { + obj->x = (point[ppos + 1] << 4) + + (point[ppos + 3] >> 4); + obj->y = (point[ppos + 2] << 4) + + (point[ppos + 3] & 0xf); + if ((obj->x > ts->prop.max_x) || + (obj->y > ts->prop.max_y)) + continue; + + obj->tm = point[ppos + 4]; + if (obj->tm == 0) + obj->tm = 1; + + obj->z = point[ppos + 5]; + if (i < 2) { + obj->z += point[i + 63] << 8; + if (obj->z > TOUCH_MAX_PRESSURE) + obj->z = TOUCH_MAX_PRESSURE; + } + + if (obj->z == 0) + obj->z = 1; + + input_mt_slot(input, input_id - 1); + input_mt_report_slot_state(input, + MT_TOOL_FINGER, true); + touchscreen_report_pos(input, &ts->prop, obj->x, + obj->y, true); + + input_report_abs(input, ABS_MT_TOUCH_MAJOR, obj->tm); + input_report_abs(input, ABS_MT_PRESSURE, obj->z); + + finger_cnt++; + } + } + input_mt_sync_frame(input); + input_sync(input); + +xfer_error: + enable_irq(ts->hw_client->irq); + + mutex_unlock(&ts->lock); +} + +static irqreturn_t nt36xxx_i2c_irq_handler(int irq, void *dev_id) +{ + struct nt36xxx_i2c *ts = dev_id; + + disable_irq_nosync(ts->hw_client->irq); + nt36xxx_report(ts); + + return IRQ_HANDLED; +} + +static bool nt36xxx_in_crc_reboot_loop(u8 *buf) +{ + return ((buf[0] == 0xFC) && (buf[1] == 0xFC) && (buf[2] == 0xFC)) || + ((buf[0] == 0xFF) && (buf[1] == 0xFF) && (buf[2] == 0xFF)); +} + +/** + * nt36xxx_stop_crc_reboot - Stop CRC reboot loop and warm-reboot the firmware + * @ts: Main driver structure + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_stop_crc_reboot(struct nt36xxx_i2c *ts) +{ + u8 buf[3] = { 0 }; + u8 val; + int ret, retry = NT36XXX_MAX_RETRIES; + + /* Read dummy buffer to check CRC fail reboot is happening or not */ + + /* Change I2C index to prevent getting 0xFF, but not 0xFC */ + ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO); + if (ret) { + dev_dbg(&ts->hw_client->dev, + "CRC reset failed: Cannot select page.\n"); + return ret; + } + + /* If ChipID command returns 0xFC or 0xFF, the MCU is in CRC reboot */ + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CHIPID, + buf, sizeof(buf)); + if (ret) + return ret; + + if (!nt36xxx_in_crc_reboot_loop(buf)) + return 0; + + /* IC is in CRC fail reboot loop, needs to be stopped! */ + do { + /* Special reset-idle sequence for CRC failure */ + ret = regmap_write(ts->regmap, ts->hw_client->addr, + NT36XXX_CMD_SW_RESET); + if (ret) + dev_dbg(&ts->hw_client->dev, + "SW Reset 1 failed: may not recover\n"); + + ret = regmap_write(ts->regmap, ts->hw_client->addr, + NT36XXX_CMD_SW_RESET); + if (ret) + dev_dbg(&ts->hw_client->dev, + "SW Reset 2 failed: may not recover\n"); + usleep_range(1000, 1100); + + /* Clear CRC_ERR_FLAG */ + ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC); + if (ret) + continue; + + val = 0xA5; + ret = regmap_raw_write(ts->fw_regmap, NT36XXX_EVT_CRC, + &val, sizeof(val)); + if (ret) + continue; + + /* Check CRC_ERR_FLAG */ + ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC); + if (ret) + continue; + + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CRC, + &buf, sizeof(buf)); + if (ret) + continue; + + if (buf[0] == 0xA5) + break; + } while (--retry); + + if (retry == 0) { + dev_err(&ts->hw_client->dev, + "CRC reset failed: buf=0x%2ph\n", buf); + } + + return ret; +} + +/** + * nt36xxx_i2c_chip_version_init - Detect Novatek NT36xxx family IC + * @ts: Main driver structure + * + * This function reads the ChipID from the IC and sets the right + * memory map for the detected chip. + * + * Return: Always zero for success, negative number for error + */ +static int nt36xxx_i2c_chip_version_init(struct nt36xxx_i2c *ts) +{ + u8 buf[7] = { 0 }; + int retry = NT36XXX_MAX_RETRIES; + int sz = sizeof(trim_id_table) / sizeof(struct nt36xxx_trim_table); + int i, list, mapid, ret; + + ret = nt36xxx_bootloader_reset(ts); + if (ret) { + dev_err(&ts->hw_client->dev, "Can't reset the nvt IC\n"); + return ret; + } + + do { + ret = nt36xxx_sw_reset_idle(ts); + if (ret) + continue; + + ret = regmap_write(ts->regmap, ts->hw_client->addr, NT36XXX_CMD_UNLOCK); + if (ret) + continue; + usleep_range(10000, 11000); + + ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO); + if (ret) + continue; + + memset(buf, 0, ARRAY_SIZE(buf)); + ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CHIPID, + buf, sizeof(buf)); + if (ret) + continue; + + /* Compare read chip id with trim list */ + for (list = 0; list < sz; list++) { + /* Compare each not masked byte */ + for (i = 0; i < NT36XXX_ID_LEN_MAX; i++) { + if (trim_id_table[list].mask[i] && + buf[i] != trim_id_table[list].id[i]) + break; + } + + if (i == NT36XXX_ID_LEN_MAX) { + mapid = trim_id_table[list].mapid; + ts->mmap = &nt36xxx_memory_maps[mapid]; + return 0; + } + + ts->mmap = NULL; + ret = -ENOENT; + } + + /* Stop CRC check to prevent IC auto reboot */ + if (nt36xxx_in_crc_reboot_loop(buf)) { + ret = nt36xxx_stop_crc_reboot(ts); + if (ret) + continue; + } + + usleep_range(10000, 11000); + } while (--retry); + + return ret; +} + +static const struct regmap_config nt36xxx_i2c_regmap_hw_config = { + .name = "nt36xxx_i2c_hw", + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_NONE, +}; + +static const struct regmap_config nt36xxx_i2c_regmap_fw_config = { + .name = "nt36xxx_i2c_fw", + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_NONE, +}; + +static void nt36xxx_disable_regulators(void *data) +{ + struct nt36xxx_i2c *ts = data; + + regulator_bulk_disable(NT36XXX_NUM_SUPPLIES, ts->supplies); +} + +static int nt36xxx_i2c_probe(struct i2c_client *hw_client, + const struct i2c_device_id *id) +{ + struct nt36xxx_i2c *ts; + struct input_dev *input; + int ret; + + if (!i2c_check_functionality(hw_client->adapter, I2C_FUNC_I2C)) { + dev_err(&hw_client->dev, "i2c_check_functionality error\n"); + return -EIO; + } + + if (!hw_client->irq) { + dev_err(&hw_client->dev, "No irq specified\n"); + return -EINVAL; + } + + ts = devm_kzalloc(&hw_client->dev, sizeof(struct nt36xxx_i2c), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + ts->supplies = devm_kcalloc(&hw_client->dev, + NT36XXX_NUM_SUPPLIES, + sizeof(struct regulator_bulk_data), + GFP_KERNEL); + if (!ts->supplies) + return -ENOMEM; + + input = devm_input_allocate_device(&hw_client->dev); + if (!input) + return -ENOMEM; + + ts->fw_client = i2c_new_dummy_device(hw_client->adapter, + NT36XXX_FW_ADDR); + if (IS_ERR(ts->fw_client)) { + dev_err(&hw_client->dev, "Cannot add FW I2C device\n"); + return PTR_ERR(ts->fw_client); + } + + ts->hw_client = hw_client; + ts->input = input; + i2c_set_clientdata(ts->hw_client, ts); + i2c_set_clientdata(ts->fw_client, ts); + + ts->reset_gpio = devm_gpiod_get_optional(&hw_client->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(ts->reset_gpio)) + return PTR_ERR(ts->reset_gpio); + gpiod_set_consumer_name(ts->reset_gpio, "nt36xxx reset"); + + /* These supplies are optional */ + ts->supplies[0].supply = "vdd"; + ts->supplies[1].supply = "vio"; + ret = devm_regulator_bulk_get(&hw_client->dev, + NT36XXX_NUM_SUPPLIES, + ts->supplies); + if (ret != 0) { + if (ret != -EPROBE_DEFER) + dev_err(&hw_client->dev, + "Cannot get supplies: %d\n", ret); + return ret; + } + + ts->regmap = devm_regmap_init_i2c(ts->hw_client, + &nt36xxx_i2c_regmap_hw_config); + if (IS_ERR(ts->regmap)) { + dev_err(&hw_client->dev, "regmap (hw-addr) init failed\n"); + return PTR_ERR(ts->regmap); + } + + ts->fw_regmap = devm_regmap_init_i2c(ts->fw_client, + &nt36xxx_i2c_regmap_fw_config); + if (IS_ERR(ts->fw_regmap)) { + dev_err(&hw_client->dev, "regmap (fw-addr) init failed\n"); + return PTR_ERR(ts->fw_regmap); + } + + ret = regulator_bulk_enable(NT36XXX_NUM_SUPPLIES, ts->supplies); + if (ret) + return ret; + + usleep_range(10000, 11000); + + ret = devm_add_action_or_reset(&hw_client->dev, + nt36xxx_disable_regulators, ts); + if (ret) + return ret; + + mutex_init(&ts->lock); + + /* Set memory maps for the specific chip version */ + ret = nt36xxx_i2c_chip_version_init(ts); + if (ret) { + dev_err(&hw_client->dev, "Failed to check chip version\n"); + return ret; + } + + /* Reset the MCU */ + ret = nt36xxx_bootloader_reset(ts); + if (ret < 0) + return ret; + + /* Check and eventually wait until the MCU goes in reset state */ + ret = nt36xxx_check_reset_state(ts, NT36XXX_STATE_INIT); + if (ret < 0) + return ret; + + /* Get informations from the TS firmware */ + ret = nt36xxx_get_fw_info(ts); + if (ret < 0) + return ret; + + input->phys = devm_kasprintf(&hw_client->dev, GFP_KERNEL, + "%s/input0", dev_name(&hw_client->dev)); + + input->name = "Novatek NT36XXX Touchscreen"; + input->id.bustype = BUS_I2C; + input->dev.parent = &hw_client->dev; + + __set_bit(EV_KEY, input->evbit); + __set_bit(EV_ABS, input->evbit); + input_set_capability(input, EV_KEY, BTN_TOUCH); + + ret = input_mt_init_slots(input, TOUCH_MAX_FINGER_NUM, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); + if (ret) { + dev_err(&hw_client->dev, "Cannot init MT slots (%d)\n", ret); + return ret; + } + + input_set_abs_params(input, ABS_MT_PRESSURE, 0, + TOUCH_MAX_PRESSURE, 0, 0); + input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); + + input_set_abs_params(input, ABS_MT_POSITION_X, 0, + ts->fw_info.abs_x_max - 1, 0, 0); + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, + ts->fw_info.abs_y_max - 1, 0, 0); + + /* Override the firmware defaults, if needed */ + touchscreen_parse_properties(input, true, &ts->prop); + + input_set_drvdata(input, ts); + + ret = input_register_device(ts->input); + if (ret) { + dev_err(&hw_client->dev, "Failed to register input device: %d\n", + ret); + return ret; + } + + ret = devm_request_threaded_irq(&hw_client->dev, hw_client->irq, NULL, + nt36xxx_i2c_irq_handler, IRQF_ONESHOT, + hw_client->name, ts); + if (ret) { + dev_err(&hw_client->dev, "request irq failed: %d\n", ret); + return ret; + } + + return 0; +} + +static int __maybe_unused nt36xxx_i2c_suspend(struct device *dev) +{ + struct nt36xxx_i2c *ts = i2c_get_clientdata(to_i2c_client(dev)); + int ret; + + disable_irq(ts->hw_client->irq); + + ret = regmap_write(ts->fw_regmap, NT36XXX_EVT_HOST_CMD, + NT36XXX_CMD_ENTER_SLEEP); + if (ret) { + dev_err(&ts->hw_client->dev, "Cannot enter suspend!!\n"); + return ret; + } + + gpiod_set_value(ts->reset_gpio, 1); + + return 0; +} + +static int __maybe_unused nt36xxx_i2c_resume(struct device *dev) +{ + struct nt36xxx_i2c *ts = i2c_get_clientdata(to_i2c_client(dev)); + int ret; + + mutex_lock(&ts->lock); + + gpiod_set_value(ts->reset_gpio, 0); + + /* Reboot the MCU (also recalibrates the TS) */ + ret = nt36xxx_bootloader_reset(ts); + if (ret < 0) + goto end; + + ret = nt36xxx_check_reset_state(ts, NT36XXX_STATE_REK); + if (ret < 0) + goto end; + + enable_irq(ts->hw_client->irq); +end: + mutex_unlock(&ts->lock); + return ret; +} + +static SIMPLE_DEV_PM_OPS(nt36xxx_i2c_pm, + nt36xxx_i2c_suspend, nt36xxx_i2c_resume); + +static const struct of_device_id nt36xxx_of_match[] = { + { .compatible = "novatek,nt36525" }, + { } +}; +MODULE_DEVICE_TABLE(of, nt36xxx_of_match); + +static const struct i2c_device_id nt36xxx_i2c_ts_id[] = { + { "NVT-ts", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, nt36xxx_i2c_ts_id); + +static struct i2c_driver nt36xxx_i2c_ts_driver = { + .driver = { + .name = "nt36xxx_ts", + .pm = &nt36xxx_i2c_pm, + .of_match_table = nt36xxx_of_match, + }, + .id_table = nt36xxx_i2c_ts_id, + .probe = nt36xxx_i2c_probe, +}; +module_i2c_driver(nt36xxx_i2c_ts_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Novatek NT36XXX Touchscreen Driver"); +MODULE_AUTHOR("AngeloGioacchino Del Regno "); From patchwork Sat Oct 24 10:51:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 11854795 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E98776A2 for ; Sat, 24 Oct 2020 10:51:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF5F924650 for ; 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Sat, 24 Oct 2020 03:51:22 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu ([2.237.20.237]) by smtp.gmail.com with ESMTPSA id 3sm8792632wmd.19.2020.10.24.03.51.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Oct 2020 03:51:21 -0700 (PDT) From: kholk11@gmail.com To: dmitry.torokhov@gmail.com Cc: robh+dt@kernel.org, rydberg@bitmath.org, priv.luk@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, kholk11@gmail.com, marijns95@gmail.com, konradybcio@gmail.com, martin.botka1@gmail.com, phone-devel@vger.kernel.org, devicetree@vger.kernel.org, krzk@kernel.org, andy.shevchenko@gmail.com Subject: [PATCH v7 3/3] dt-bindings: touchscreen: Add binding for Novatek NT36xxx series driver Date: Sat, 24 Oct 2020 12:51:11 +0200 Message-Id: <20201024105111.15829-4-kholk11@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201024105111.15829-1-kholk11@gmail.com> References: <20201024105111.15829-1-kholk11@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: AngeloGioacchino Del Regno Add binding for the Novatek NT36xxx series touchscreen driver. Signed-off-by: AngeloGioacchino Del Regno --- .../bindings/input/touchscreen/nt36xxx.yaml | 59 +++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml diff --git a/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml b/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml new file mode 100644 index 000000000000..1486b20d6c49 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml @@ -0,0 +1,59 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/touchscreen/nt36xxx.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Novatek NT36xxx series touchscreen controller Bindings + +maintainers: + - AngeloGioacchino Del Regno + +allOf: + - $ref: touchscreen.yaml# + +properties: + compatible: + const: novatek,nt36525 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + reset-gpios: + maxItems: 1 + + vdd-supply: + description: Power supply regulator for VDD pin + + vio-supply: + description: Power supply regulator on VDD-IO pin + +unevaluatedProperties: false + +required: + - compatible + - reg + - interrupts + +examples: + - | + #include + #include + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + touchscreen@62 { + compatible = "novatek,nt36525"; + reg = <0x62>; + interrupt-parent = <&tlmm>; + interrupts = <45 IRQ_TYPE_EDGE_RISING>; + reset-gpio = <&tlmm 102 GPIO_ACTIVE_HIGH>; + }; + }; + +...