From patchwork Tue Dec 20 16:10:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geoff Lansberry X-Patchwork-Id: 9481775 X-Patchwork-Delegate: sameo@linux.intel.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 39EFE606DB for ; Tue, 20 Dec 2016 16:15:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 289A2223A6 for ; Tue, 20 Dec 2016 16:15:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1C2E728410; Tue, 20 Dec 2016 16:15:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9EB95223A6 for ; Tue, 20 Dec 2016 16:15:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761882AbcLTQLN (ORCPT ); Tue, 20 Dec 2016 11:11:13 -0500 Received: from mail-qt0-f182.google.com ([209.85.216.182]:33776 "EHLO mail-qt0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762936AbcLTQLJ (ORCPT ); Tue, 20 Dec 2016 11:11:09 -0500 Received: by mail-qt0-f182.google.com with SMTP id p16so178623880qta.0 for ; Tue, 20 Dec 2016 08:11:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kuvee-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id; bh=7TefIh6w1w/QP9NcJs0TUggk3dmSJTF2XrG5x65Frn8=; b=v11/tVo+caZF1fyTPMnrYiWPm39V81gu/exrDSrsyiQ6T1yZJo6AbQ9a7tk+jLolu1 y1PTFw3p7nmuoQK0MLy6i5LVDmPUtHXftny8H5yv4PROO/I0OJS1HqNt0Kz15lfZlKMP F1ZR/EsVFbLI5UDfYWk7l/gMStClZm1kIhaAFySHgWMlbFEDkgZ+sE78CvvOECt6lkxm KRaWnfueYjGYFpi5AaGk0D9bTXcIEJQfV4adx+AWvSyfW8SkXO/CbUN59Ri1vDvLOzSm 8ayAw14iKYbGFK+Gcto7Esh74iWAe4raZtttldzQr4/xjmUEJAxLSDieKbwcLEpHXxFh PXiA== 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; bh=7TefIh6w1w/QP9NcJs0TUggk3dmSJTF2XrG5x65Frn8=; b=NPvgMM5tZ1UgPLHlGd0iDQvgen0+7A2NYh0kwc2aQoS+iM+NlQw5sklLtUCzcCOSV1 OcSYfSdTf3ySX/KlFxDKTKmk9l58wahzaUwLDE3Rkl/HBSbBayKwCkgcKZW+FxXtlt9U WymBPnQxBDLXVhtZ98tZdOh0U4ITNJWX3SXcGrl5CT4SoBiafFRlGWVaDIJGVr4mvWLW +3ccgtA27i7OVwjq8yZrOYq5mwSu0EOEqStZQrHlqS/aVO/vpSFNAhwG8yhbxUPCpSX8 jAwYpv4BIYRvjZVOOu1d/30sSKBhQ+sDBkun0iMXhn4on7Uc8vAcxrOX1z2+LidcAMXx e6fw== X-Gm-Message-State: AIkVDXKZiPEM2tCESs/OY4790r2eyGC/e8stm+fXLh2MmONfOVFy2sLiYDbt5cQsMYmeVw== X-Received: by 10.200.37.7 with SMTP id 7mr121061qtm.102.1482250267751; Tue, 20 Dec 2016 08:11:07 -0800 (PST) Received: from localhost.localdomain (c-73-119-141-105.hsd1.ma.comcast.net. [73.119.141.105]) by smtp.googlemail.com with ESMTPSA id u7sm13370785qkh.2.2016.12.20.08.11.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 20 Dec 2016 08:11:06 -0800 (PST) From: Geoff Lansberry X-Google-Original-From: Geoff Lansberry To: linux-wireless@vger.kernel.org Cc: lauro.venancio@openbossa.org, aloisio.almeida@openbossa.org, sameo@linux.intel.com, robh+dt@kernel.org, mark.rutland@arm.com, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mgreer@animalcreek.com, justin@kuvee.com, Geoff Lansberry Subject: [PATCH 1/3] NFC: trf7970a: add device tree option for 27MHz clock Date: Tue, 20 Dec 2016 11:10:44 -0500 Message-Id: <1482250250-4192-1-git-send-email-glansberry@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Geoff Lansberry The TRF7970A has configuration options to support hardware designs which use a 27.12MHz clock. This commit adds a device tree option 'clock-frequency' to support configuring the this chip for default 13.56MHz clock or the optional 27.12MHz clock. --- .../devicetree/bindings/net/nfc/trf7970a.txt | 4 ++ drivers/nfc/trf7970a.c | 50 +++++++++++++++++----- 2 files changed, 43 insertions(+), 11 deletions(-) diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt index 32b35a0..e262ac1 100644 --- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt +++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt @@ -21,6 +21,8 @@ Optional SoC Specific Properties: - t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum where an extra byte is returned by Read Multiple Block commands issued to Type 5 tags. +- clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz + Example (for ARM-based BeagleBone with TRF7970A on SPI1): @@ -43,6 +45,8 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): irq-status-read-quirk; en2-rf-quirk; t5t-rmb-extra-byte-quirk; + vdd_io_1v8; + clock-frequency = <27120000>; status = "okay"; }; }; diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index 26c9dbb..4e051e9 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -124,6 +124,9 @@ NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ +#define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 +#define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 + #define TRF7970A_RX_SKB_ALLOC_SIZE 256 @@ -1056,12 +1059,11 @@ static int trf7970a_init(struct trf7970a *trf) trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; - ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 0); + ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, + trf->modulator_sys_clk_ctrl); if (ret) goto err_out; - trf->modulator_sys_clk_ctrl = 0; - ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); @@ -1181,27 +1183,37 @@ static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) switch (tech) { case NFC_DIGITAL_RF_TECH_106A: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_OOK; trf->guard_time = TRF7970A_GUARD_TIME_NFCA; break; case NFC_DIGITAL_RF_TECH_106B: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_ASK10; trf->guard_time = TRF7970A_GUARD_TIME_NFCB; break; case NFC_DIGITAL_RF_TECH_212F: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_ASK10; trf->guard_time = TRF7970A_GUARD_TIME_NFCF; break; case NFC_DIGITAL_RF_TECH_424F: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_ASK10; trf->guard_time = TRF7970A_GUARD_TIME_NFCF; break; case NFC_DIGITAL_RF_TECH_ISO15693: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_OOK; trf->guard_time = TRF7970A_GUARD_TIME_15693; break; default: @@ -1571,17 +1583,23 @@ static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_OOK; break; case NFC_DIGITAL_RF_TECH_212F: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | TRF7970A_ISO_CTRL_NFC_NFCF_212; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_ASK10; break; case NFC_DIGITAL_RF_TECH_424F: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | TRF7970A_ISO_CTRL_NFC_NFCF_424; - trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; + trf->modulator_sys_clk_ctrl = + (trf->modulator_sys_clk_ctrl & 0xF8) | + TRF7970A_MODULATOR_DEPTH_ASK10; break; default: dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); @@ -1987,6 +2005,7 @@ static int trf7970a_probe(struct spi_device *spi) struct device_node *np = spi->dev.of_node; struct trf7970a *trf; int uvolts, autosuspend_delay, ret; + u32 clk_freq = 13560000; if (!np) { dev_err(&spi->dev, "No Device Tree entry\n"); @@ -2043,6 +2062,15 @@ static int trf7970a_probe(struct spi_device *spi) return ret; } + of_property_read_u32(np, "clock-frequency", &clk_freq); + if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) || + (clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY)) { + dev_err(trf->dev, + "clock-frequency (%u Hz) unsupported\n", + clk_freq); + return -EINVAL; + } + if (of_property_read_bool(np, "en2-rf-quirk")) trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;