From patchwork Sun Jul 23 10:27:41 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Icenowy Zheng X-Patchwork-Id: 9858383 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 54522600F5 for ; Sun, 23 Jul 2017 10:30:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 44FA428474 for ; Sun, 23 Jul 2017 10:30:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 399F328500; Sun, 23 Jul 2017 10:30:46 +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,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 462C92847A for ; Sun, 23 Jul 2017 10:30:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755265AbdGWK2Z (ORCPT ); Sun, 23 Jul 2017 06:28:25 -0400 Received: from hermes.aosc.io ([199.195.250.187]:59273 "EHLO hermes.aosc.io" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752133AbdGWK2W (ORCPT ); Sun, 23 Jul 2017 06:28:22 -0400 Received: from localhost (localhost [127.0.0.1]) (Authenticated sender: icenowy@aosc.io) by hermes.aosc.io (Postfix) with ESMTPSA id 02D5C545C7; Sun, 23 Jul 2017 10:28:16 +0000 (UTC) From: Icenowy Zheng To: Liam Girdwood , Mark Brown , Maxime Ripard , Chen-Yu Tsai Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-pm@vger.kernel.org, linux-sunxi@googlegroups.com, Ondrej Jirman , Icenowy Zheng Subject: [PATCH 02/10] regulator: add support for SY8106A regulator Date: Sun, 23 Jul 2017 18:27:41 +0800 Message-Id: <20170723102749.17323-3-icenowy@aosc.io> In-Reply-To: <20170723102749.17323-1-icenowy@aosc.io> References: <20170723102749.17323-1-icenowy@aosc.io> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ondrej Jirman SY8106A is an I2C attached single output regulator made by Silergy Corp, which is used on several Allwinner H3/H5 SBCs to control the power supply of the ARM cores. Add a driver for it. Signed-off-by: Ondrej Jirman [Icenowy: Change commit message] Signed-off-by: Icenowy Zheng --- drivers/regulator/Kconfig | 8 +- drivers/regulator/Makefile | 2 +- drivers/regulator/sy8106a-regulator.c | 163 ++++++++++++++++++++++++++++++++++ 3 files changed, 171 insertions(+), 2 deletions(-) create mode 100644 drivers/regulator/sy8106a-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 99b9362331b5..1efa73e18d07 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -764,6 +764,13 @@ config REGULATOR_STW481X_VMMC This driver supports the internal VMMC regulator in the STw481x PMIC chips. +config REGULATOR_SY8106A + tristate "Silergy SY8106A regulator" + depends on I2C && (OF || COMPILE_TEST) + select REGMAP_I2C + help + This driver supports SY8106A single output regulator. + config REGULATOR_TPS51632 tristate "TI TPS51632 Power Regulator" depends on I2C @@ -938,4 +945,3 @@ config REGULATOR_WM8994 WM8994 CODEC. endif - diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 95b1e86ae692..f5120252f86a 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -95,6 +95,7 @@ obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o +obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o @@ -120,5 +121,4 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o - ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG diff --git a/drivers/regulator/sy8106a-regulator.c b/drivers/regulator/sy8106a-regulator.c new file mode 100644 index 000000000000..1df889f68b3d --- /dev/null +++ b/drivers/regulator/sy8106a-regulator.c @@ -0,0 +1,163 @@ +/* + * sy8106a-regulator.c - Regulator device driver for SY8106A + * + * Copyright (C) 2016 Ondřej Jirman + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include + +#define SY8106A_REG_VOUT1_SEL 0x01 +#define SY8106A_REG_VOUT_COM 0x02 +#define SY8106A_REG_VOUT1_SEL_MASK 0x7f +#define SY8106A_DISABLE_REG BIT(0) +#define SY8106A_GO_BIT BIT(7) + +struct sy8106a { + struct regulator_dev *rdev; + struct regmap *regmap; +}; + +static const struct regmap_config sy8106a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int sy8106a_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) +{ + /* We use our set_voltage_sel in order to avoid unnecessary I2C + * chatter, because the regulator_get_voltage_sel_regmap using + * apply_bit would perform 4 unnecessary transfers instead of one, + * increasing the chance of error. + */ + return regmap_write(rdev->regmap, rdev->desc->vsel_reg, + sel | SY8106A_GO_BIT); +} + +static const struct regulator_ops sy8106a_ops = { + .is_enabled = regulator_is_enabled_regmap, + .set_voltage_sel = sy8106a_set_voltage_sel, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, +}; + +/* Default limits measured in millivolts and milliamps */ +#define SY8106A_MIN_MV 680 +#define SY8106A_MAX_MV 1950 +#define SY8106A_STEP_MV 10 + +static const struct regulator_desc sy8106a_reg = { + .name = "SY8106A", + .id = 0, + .ops = &sy8106a_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1, + .min_uV = (SY8106A_MIN_MV * 1000), + .uV_step = (SY8106A_STEP_MV * 1000), + .vsel_reg = SY8106A_REG_VOUT1_SEL, + .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK, + .enable_reg = SY8106A_REG_VOUT_COM, + .enable_mask = SY8106A_DISABLE_REG, + .disable_val = SY8106A_DISABLE_REG, + .enable_is_inverted = 1, + .owner = THIS_MODULE, +}; + +/* + * I2C driver interface functions + */ +static int sy8106a_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct sy8106a *chip; + struct device *dev = &i2c->dev; + struct regulator_dev *rdev = NULL; + struct regulator_config config = { }; + unsigned int selector; + int error; + + chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config); + if (IS_ERR(chip->regmap)) { + error = PTR_ERR(chip->regmap); + dev_err(&i2c->dev, "Failed to allocate register map: %d\n", + error); + return error; + } + + config.dev = &i2c->dev; + config.regmap = chip->regmap; + config.driver_data = chip; + + config.of_node = dev->of_node; + config.init_data = of_get_regulator_init_data(dev, dev->of_node, + &sy8106a_reg); + + if (!config.init_data) + return -ENOMEM; + + /* Probe regulator */ + error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, &selector); + if (error) { + dev_err(&i2c->dev, "Failed to read voltage at probe time: %d\n", error); + return error; + } + + rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config); + if (IS_ERR(rdev)) { + error = PTR_ERR(rdev); + dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error); + return error; + } + + chip->rdev = rdev; + + i2c_set_clientdata(i2c, chip); + + return 0; +} + +static const struct of_device_id sy8106a_i2c_of_match[] = { + { .compatible = "silergy,sy8106a" }, + { }, +}; +MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match); + +static const struct i2c_device_id sy8106a_i2c_id[] = { + { "sy8106a", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id); + +static struct i2c_driver sy8106a_regulator_driver = { + .driver = { + .name = "sy8106a", + .of_match_table = of_match_ptr(sy8106a_i2c_of_match), + }, + .probe = sy8106a_i2c_probe, + .id_table = sy8106a_i2c_id, +}; + +module_i2c_driver(sy8106a_regulator_driver); + +MODULE_AUTHOR("Ondřej Jirman "); +MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); +MODULE_LICENSE("GPL v2");