From patchwork Mon May 17 14:35:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: cy_huang X-Patchwork-Id: 440364 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19F78C4361B for ; Mon, 17 May 2021 15:46:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED04561108 for ; Mon, 17 May 2021 15:46:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244931AbhEQPrV (ORCPT ); Mon, 17 May 2021 11:47:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344252AbhEQPnv (ORCPT ); Mon, 17 May 2021 11:43:51 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 449F9C043146; Mon, 17 May 2021 07:36:15 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id x188so5078750pfd.7; Mon, 17 May 2021 07:36:15 -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; bh=VhyK59CMD+e1FlyVP/nz0DNHuduzhFeXUXxioP1NDGA=; b=LEtm0i1UJmElWlbaGeyGj/T7zh0Aml76Cw6NS6nKogLlMxcRq9Cq6GETRajWTsxTP+ VVv301JduFCdnj4JtrbZ0VerknaEf3zDBF2wM4TApiUuJhkUZGwsNdhG/h58j61Vy2Ze aiIq1XpUJBtyGMmieGrHBdzwLfAERvKsfVs2ozdet7nwJ2A7T+aZaxd4JfFDf2sokRyG BY5gd+dS/I8GbBr/3m5jUS1N4lcVKr483BtRKqSwVOZ9DGzqgcgH3agkFharct29K/io asDKHA088YiaAt6gajqgbt2jOZlyiMBI0GN7vIDVqVYnFTjzaIRrYqUZKwRlgQValgWS deCA== 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=VhyK59CMD+e1FlyVP/nz0DNHuduzhFeXUXxioP1NDGA=; b=ST1XKeGu6MBCwG4zZqDgTuMArl9fTWNZvfoqEMerOd8MN2CZVrwl3zmVtQuzHstxDf Xc+6zsBjiOzfL5jMUCZQjqVZjqVBqjQ/JpN3au3onbEbkLXhuzwFEQJyiLUT2zXgl/dH BAj6ecxg71Lb2CYyyVxnNduwhSRVxgj25mCT4Y+iuNko5Dxi7IfI3SfBkBKqg14v6u4i DIsk6hCe4YITBYBfQ6qsM7fkNi4Mp8FHIApqtpScq3YSqcyceHMfa/6wH3ERPQRpLkU0 vTt185GfRyjBVT13wxMYpv75lQrcYZ58s/izkyEsNrg5arbEysAhCvIUUrP95TsEnl45 DeRQ== X-Gm-Message-State: AOAM5301pr4eO45tf5/LXUkfHeP8Bi7z4Qs2xm15U2CrlCe9LRNoL7SK JwczO+SQTX701NxoFjVThC4= X-Google-Smtp-Source: ABdhPJy57qCjD4MslISDYuYUUV/yX+09S4Su2cOeQW0N+6g1KyEts3dYkBgTA14+9XlP4Oy6nKCTfQ== X-Received: by 2002:a65:468d:: with SMTP id h13mr60199280pgr.373.1621262174608; Mon, 17 May 2021 07:36:14 -0700 (PDT) Received: from localhost.localdomain (1-171-3-209.dynamic-ip.hinet.net. [1.171.3.209]) by smtp.gmail.com with ESMTPSA id f5sm13880259pjp.37.2021.05.17.07.36.10 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 May 2021 07:36:13 -0700 (PDT) From: cy_huang To: lee.jones@linaro.org, lgirdwood@gmail.com, broonie@kernel.org, daniel.thompson@linaro.org, jingoohan1@gmail.com, b.zolnierkie@samsung.com, pavel@ucw.cz, robh+dt@kernel.org Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, cy_huang@richtek.com Subject: [PATCH v7 1/4] mfd: rt4831: Adds support for Richtek RT4831 Date: Mon, 17 May 2021 22:35:58 +0800 Message-Id: <1621262161-9972-1-git-send-email-u0084500@gmail.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org From: ChiYuan Huang This adds support Richtek RT4831 core. It includes four channel WLED driver and Display Bias Voltage outputs. Signed-off-by: ChiYuan Huang --- - Send the patch series for the wrong mail subject. The RT4831 regulator patches are already on main stream, and can be referred to 9351ab8b0cb6 regulator: rt4831: Adds support for Richtek RT4831 DSV regulator 934b05e81862 regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator since v6 - Respin the date from 2020 to 2021. - Rmove the shutdown routine. - Change the macro OF_MFD_CELL to MFD_CELL_OF. since v5 - Rename file name from rt4831-core.c to rt4831.c - Change RICHTEK_VID to RICHTEK_VENDOR_ID. - Change gpio_desc nameing from 'enable' to 'enable_gpio' in probe. - Change variable 'val' to the meaningful name 'chip_id'. - Refine the error log when vendor id is not matched. - Remove of_match_ptr. since v2 - Refine Kconfig descriptions. - Add copyright. - Refine error logs in probe. - Refine comment lines in remove and shutdown. --- drivers/mfd/Kconfig | 10 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/rt4831.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 drivers/mfd/rt4831.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 5c7f2b1..49e57c9 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1076,6 +1076,16 @@ config MFD_RDC321X southbridge which provides access to GPIOs and Watchdog using the southbridge PCI device configuration space. +config MFD_RT4831 + tristate "Richtek RT4831 four channel WLED and Display Bias Voltage" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + This enables support for the Richtek RT4831 that includes 4 channel + WLED driving and Display Bias Voltage. It's commonly used to provide + power to the LCD display and LCD backlight. + config MFD_RT5033 tristate "Richtek RT5033 Power Management IC" depends on I2C diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 4f6d2b8..eb42bd4 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -234,6 +234,7 @@ obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o obj-$(CONFIG_MFD_DLN2) += dln2.o +obj-$(CONFIG_MFD_RT4831) += rt4831.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o diff --git a/drivers/mfd/rt4831.c b/drivers/mfd/rt4831.c new file mode 100644 index 00000000..b169781 --- /dev/null +++ b/drivers/mfd/rt4831.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2021 Richtek Technology Corp. + * + * Author: ChiYuan Huang + */ + +#include +#include +#include +#include +#include +#include + +#define RT4831_REG_REVISION 0x01 +#define RT4831_REG_ENABLE 0x08 +#define RT4831_REG_I2CPROT 0x15 + +#define RICHTEK_VENDOR_ID 0x03 +#define RT4831_VID_MASK GENMASK(1, 0) +#define RT4831_RESET_MASK BIT(7) +#define RT4831_I2CSAFETMR_MASK BIT(0) + +static const struct mfd_cell rt4831_subdevs[] = { + MFD_CELL_OF("rt4831-backlight", NULL, NULL, 0, 0, "richtek,rt4831-backlight"), + MFD_CELL_NAME("rt4831-regulator") +}; + +static bool rt4831_is_accessible_reg(struct device *dev, unsigned int reg) +{ + if (reg >= RT4831_REG_REVISION && reg <= RT4831_REG_I2CPROT) + return true; + return false; +} + +static const struct regmap_config rt4831_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT4831_REG_I2CPROT, + + .readable_reg = rt4831_is_accessible_reg, + .writeable_reg = rt4831_is_accessible_reg, +}; + +static int rt4831_probe(struct i2c_client *client) +{ + struct gpio_desc *enable_gpio; + struct regmap *regmap; + unsigned int chip_id; + int ret; + + enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(enable_gpio)) { + dev_err(&client->dev, "Failed to get 'enable' GPIO\n"); + return PTR_ERR(enable_gpio); + } + + regmap = devm_regmap_init_i2c(client, &rt4831_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return PTR_ERR(regmap); + } + + ret = regmap_read(regmap, RT4831_REG_REVISION, &chip_id); + if (ret) { + dev_err(&client->dev, "Failed to get H/W revision\n"); + return ret; + } + + if ((chip_id & RT4831_VID_MASK) != RICHTEK_VENDOR_ID) { + dev_err(&client->dev, "Chip vendor ID 0x%02x not matched\n", chip_id); + return -ENODEV; + } + + /* + * Used to prevent the abnormal shutdown. + * If SCL/SDA both keep low for one second to reset HW. + */ + ret = regmap_update_bits(regmap, RT4831_REG_I2CPROT, RT4831_I2CSAFETMR_MASK, + RT4831_I2CSAFETMR_MASK); + if (ret) { + dev_err(&client->dev, "Failed to enable I2C safety timer\n"); + return ret; + } + + return devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, rt4831_subdevs, + ARRAY_SIZE(rt4831_subdevs), NULL, 0, NULL); +} + +static int rt4831_remove(struct i2c_client *client) +{ + struct regmap *regmap = dev_get_regmap(&client->dev, NULL); + + /* Disable WLED and DSV outputs */ + return regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK); +} + +static const struct of_device_id __maybe_unused rt4831_of_match[] = { + { .compatible = "richtek,rt4831", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt4831_of_match); + +static struct i2c_driver rt4831_driver = { + .driver = { + .name = "rt4831", + .of_match_table = rt4831_of_match, + }, + .probe_new = rt4831_probe, + .remove = rt4831_remove, +}; +module_i2c_driver(rt4831_driver); + +MODULE_AUTHOR("ChiYuan Huang "); +MODULE_LICENSE("GPL v2");