From mboxrd@z Thu Jan 1 00:00:00 1970 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 09BECC433E0 for ; Wed, 13 Jan 2021 12:22:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7F0422A83 for ; Wed, 13 Jan 2021 12:22:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727440AbhAMMWR (ORCPT ); Wed, 13 Jan 2021 07:22:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726878AbhAMMWR (ORCPT ); Wed, 13 Jan 2021 07:22:17 -0500 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1B99C061786 for ; Wed, 13 Jan 2021 04:21:36 -0800 (PST) Received: by mail-wr1-x42d.google.com with SMTP id a12so1885031wrv.8 for ; Wed, 13 Jan 2021 04:21:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=8cweqr2u1jR2S4d8aPK1BgoPHFtAzieEjaISmB5R/+w=; b=uIL+BhRPYiZV6kElq1U6y2b/gFj4HPtngXhB5I4pSjkfAsQmSh9ztksWnRCVrtDTDJ BMK8/HPOQXE7ks2Bmqjo0rhjkTsqIaYolAFbDtU2BgZNLZXDm9rc3A/eOtlRdRu/k2r6 G3ZrYgJ8WirhF7wUupkOG07L/tdGsXko6Ks2oD+8X6MZKwn4F6IFjFP6i6QfJbK9pzZC wx2xcv1lPzHwwxFsvdlUc+SSCWwYqxkKEpXFj4NvAmG/knPCPyugkP5fOdpfzJA4osgP FJqZomg+nne1PmW2d0BZKTMKqnjXO0JOXbd5uUYqJaDShv9kdHMBDWYAmiygEvYp5ctR sLxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=8cweqr2u1jR2S4d8aPK1BgoPHFtAzieEjaISmB5R/+w=; b=UJAziuiWcib1dIcNQAY760s3aHcdchsvJFMHz3LrypNoahgvYyNjG/Vt46xdz+4wRA v1919jasrpQBJtwIdxYM1Fzunf+a9B7lQHLt4roPiasF5WdTr5gxFDavOvUkrf6ZaK9B zhMRBBHZXh/BGC8uOhgdrSGw0E7oV+y64heDNfT+yrx26sxyHmSXOrY8S2dnZP5dcVHg R2XEG8uRKGK5efz9+Ys9+nQkRm8T3RHMEXj3A/wmoNYdzbMOlhksqUWJcvdebvW4iYhy JGiaZgp4tRfGovC8JTY3d5VXswPzAkRD8ND8oBzJ6EWQrbcCvQlFiJRul1IUsRkDHHLf 5mdg== X-Gm-Message-State: AOAM532B1/A/K9gj3LbO+ZgDuuNZB48abooOodXMWLYg3Xf3hdWKtZGb VUuR+SVRAUftcrCDqB2NcMdaNw== X-Google-Smtp-Source: ABdhPJwI3ljFeHcNJZXE3Sc+lkxm+uIGbNtwwFbeOSf0wbDaK1pBaMREYnuzG85HUfzOCOZpkL/pKg== X-Received: by 2002:a5d:6a88:: with SMTP id s8mr2412998wru.118.1610540495627; Wed, 13 Jan 2021 04:21:35 -0800 (PST) Received: from dell ([91.110.221.229]) by smtp.gmail.com with ESMTPSA id b7sm2755408wru.33.2021.01.13.04.21.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Jan 2021 04:21:34 -0800 (PST) Date: Wed, 13 Jan 2021 12:21:33 +0000 From: Lee Jones To: cy_huang Cc: lgirdwood@gmail.com, broonie@kernel.org, daniel.thompson@linaro.org, jingoohan1@gmail.com, b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, ChiYuan Huang Subject: Re: [PATCH v5 1/6] mfd: rt4831: Adds support for Richtek RT4831 core Message-ID: <20210113122133.GC3975472@dell> References: <1608217244-314-1-git-send-email-u0084500@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1608217244-314-1-git-send-email-u0084500@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On Thu, 17 Dec 2020, cy_huang wrote: > 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 > --- > 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 | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 135 insertions(+) > create mode 100644 drivers/mfd/rt4831.c > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 8b99a13..dfb2640 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1088,6 +1088,16 @@ 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 1780019..28d247b 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -235,6 +235,7 @@ 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..2bf8364 > --- /dev/null > +++ b/drivers/mfd/rt4831.c > @@ -0,0 +1,124 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (c) 2020 Richtek Technology Corp. Nit: If you respin this, please bump the date. > + * 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[] = { > + OF_MFD_CELL("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 void rt4831_shutdown(struct i2c_client *client) > +{ > + struct regmap *regmap = dev_get_regmap(&client->dev, NULL); > + > + /* Disable WLED and DSV outputs */ > + regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK); > +} What is your reason for providing a .shutdown() routine? > +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, > + .shutdown = rt4831_shutdown, > +}; > +module_i2c_driver(rt4831_driver); > + > +MODULE_AUTHOR("ChiYuan Huang "); > +MODULE_LICENSE("GPL v2"); -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, 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b7sm2755408wru.33.2021.01.13.04.21.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Jan 2021 04:21:34 -0800 (PST) Date: Wed, 13 Jan 2021 12:21:33 +0000 From: Lee Jones To: cy_huang Subject: Re: [PATCH v5 1/6] mfd: rt4831: Adds support for Richtek RT4831 core Message-ID: <20210113122133.GC3975472@dell> References: <1608217244-314-1-git-send-email-u0084500@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1608217244-314-1-git-send-email-u0084500@gmail.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: daniel.thompson@linaro.org, b.zolnierkie@samsung.com, jingoohan1@gmail.com, lgirdwood@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, ChiYuan Huang , broonie@kernel.org, linux-fbdev@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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