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Message-ID: <20160125124938.GL3368@x1>
Date: Mon, 25 Jan 2016 12:49:38 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Wenyou Yang <wenyou.yang@...el.com>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Javier Martinez Canillas <javier@...hile0.org>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Peter Korsgaard <jacmet@...il.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v7 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD
driver
On Fri, 22 Jan 2016, Wenyou Yang wrote:
> This patch adds support for the Active-semi ACT8945A PMIC.
> It is a Multi Function Device with the following subdevices:
> - Regulator
> - Charger
>
> It is interfaced to the host controller using I2C interface,
> ACT8945A is a child device of the I2C.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
>
> Changes in v7:
> - remove struct act8945a_dev to .c file.
> - remove unused .h file.
>
> Changes in v6:
> - change MFD_ACT8945A type from bool to tristate.
> - revert depends on to 'I2C'.
>
> Changes in v5:
> - change depends on to 'I2C=y'.
>
> Changes in v4:
> - add a space before .compatible.
> - collect Reviewed-by from Krzysztof Kozlowski.
>
> Changes in v3: None
> Changes in v2:
> - add more help information in Kconfig.
> - update the file header with short version license and author line.
> - remove unused structure members (dev, i2c_client) of stuct act8945a_dev.
> - use define "PLATFORM_DEVID_NONE" for mfd_add_devices(), instead of '-1'.
> - use more explicit info to indicate the failure to add sub devices.
> - remove the unnecessary print out.
> - substitute MODULE_LICENSE("GPL") for MODULE_LICENSE("GPL v2").
>
> drivers/mfd/Kconfig | 11 +++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/act8945a.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 124 insertions(+)
> create mode 100644 drivers/mfd/act8945a.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9ca66de..5038e78 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -18,6 +18,17 @@ config MFD_CS5535
> This is the core driver for CS5535/CS5536 MFD functions. This is
> necessary for using the board's GPIO and MFGPT functionality.
>
> +config MFD_ACT8945A
> + tristate "Active-semi ACT8945A"
> + select MFD_CORE
> + select REGMAP_I2C
> + depends on I2C && OF
> + help
> + Support for the ACT8945A PMIC from Active-semi. This device
> + features three step-down DC/DC converters and four low-dropout
> + linear regulators, along with a complete ActivePath battery
> + charger.
> +
> config MFD_AS3711
> bool "AMS AS3711"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 0f230a6..2f1ca82 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -6,6 +6,7 @@
> obj-$(CONFIG_MFD_88PM860X) += 88pm860x.o
> obj-$(CONFIG_MFD_88PM800) += 88pm800.o 88pm80x.o
> obj-$(CONFIG_MFD_88PM805) += 88pm805.o 88pm80x.o
> +obj-$(CONFIG_MFD_ACT8945A) += act8945a.o
> obj-$(CONFIG_MFD_SM501) += sm501.o
> obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o
> obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o
> diff --git a/drivers/mfd/act8945a.c b/drivers/mfd/act8945a.c
> new file mode 100644
> index 0000000..d2e01941
> --- /dev/null
> +++ b/drivers/mfd/act8945a.c
> @@ -0,0 +1,112 @@
> +/*
> + * MFD driver for Active-semi ACT8945a PMIC
> + *
> + * Copyright (C) 2015 Atmel Corporation.
> + *
> + * Author: Wenyou Yang <wenyou.yang@...el.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +
> +struct act8945a_dev {
> + struct regmap *regmap;
> +};
> +
> +static const struct mfd_cell act8945a_devs[] = {
> + {
> + .name = "act8945a-pmic",
I think this should be -regulator, rather than -pmic.
I believe *this* is the PMIC driver.
> + .of_compatible = "active-semi,act8945a-regulator",
> + },
> + {
> + .name = "act8945a-charger",
> + .of_compatible = "active-semi,act8945a-charger",
> + },
> +};
> +
> +static const struct regmap_config act8945a_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static int act8945a_i2c_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct act8945a_dev *act8945a;
> + int ret;
> +
> + act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a), GFP_KERNEL);
> + if (!act8945a)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, act8945a);
> +
> + act8945a->regmap = devm_regmap_init_i2c(i2c, &act8945a_regmap_config);
> + if (IS_ERR(act8945a->regmap)) {
> + ret = PTR_ERR(act8945a->regmap);
> + dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
> + return ret;
> + }
Is the Regmap used in both the charger AND regulator drivers?
> + ret = mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, act8945a_devs,
> + ARRAY_SIZE(act8945a_devs), NULL, 0, NULL);
> + if (ret) {
> + dev_err(&i2c->dev, "Failed to add sub devices\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int act8945a_i2c_remove(struct i2c_client *i2c)
> +{
> + mfd_remove_devices(&i2c->dev);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id act8945a_i2c_id[] = {
> + { "act8945a", 0 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, act8945a_i2c_id);
> +
> +static const struct of_device_id act8945a_of_match[] = {
> + { .compatible = "active-semi,act8945a", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, act8945a_of_match);
> +
> +static struct i2c_driver act8945a_i2c_driver = {
> + .driver = {
> + .name = "act8945a",
> + .of_match_table = of_match_ptr(act8945a_of_match),
> + },
> + .probe = act8945a_i2c_probe,
> + .remove = act8945a_i2c_remove,
> + .id_table = act8945a_i2c_id,
> +};
> +
> +static int __init act8945a_i2c_init(void)
> +{
> + return i2c_add_driver(&act8945a_i2c_driver);
> +}
> +subsys_initcall(act8945a_i2c_init);
> +
> +static void __exit act8945a_i2c_exit(void)
> +{
> + i2c_del_driver(&act8945a_i2c_driver);
> +}
> +module_exit(act8945a_i2c_exit);
> +
> +MODULE_DESCRIPTION("ACT8945A PMIC multi-function driver");
> +MODULE_AUTHOR("Wenyou Yang <wenyou.yang@...el.com>");
> +MODULE_LICENSE("GPL");
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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