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Message-ID: <B256D81BAE5131468A838E5D7A243641D63F9777@penmbx01>
Date: Tue, 26 Jan 2016 01:46:57 +0000
From: "Yang, Wenyou" <Wenyou.Yang@...el.com>
To: Lee Jones <lee.jones@...aro.org>
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>,
"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v7 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD
driver
Hi Lee,
Thank you for your review.
> -----Original Message-----
> From: Lee Jones [mailto:lee.jones@...aro.org]
> Sent: 2016年1月25日 20:50
> To: Yang, Wenyou <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>; Ferre,
> Nicolas <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.
Yes, -regulator is better.
>
> 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?
Yes, used in both drivers.
The regmap is got through dev_get_regmap(pdev->dev.parent, NULL).
>
> > + 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 Follow Linaro: Facebook | Twitter | Blog
Best Regards,
Wenyou Yang
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