Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo <gyungoh@gmail.com>]

Hello,

Can somebody please review if the code has anything to improve?

Thanks. 

On Fri, Aug 08, 2014 at 06:08:19PM +0900, Gyungoh Yoo wrote:
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
>  Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  drivers/mfd/Kconfig                                |  12 +++
>  drivers/mfd/Makefile                               |   1 +
>  drivers/mfd/sky81452.c                             | 113 +++++++++++++++++++++
>  include/linux/mfd/sky81452.h                       |  32 ++++++
>  6 files changed, 183 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h
> 
> diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
> new file mode 100644
> index 0000000..5fb0b4f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> @@ -0,0 +1,24 @@
> +SKY81452 bindings
> +
> +Required properties:
> +- compatible	: Must be "skyworks,sky81452"
> +
> +Required child nodes:
> +- backlight	: container node for backlight following the binding
> +		in video/backlight/sky81452-backlight.txt
> +- regulator	: container node for regulators following the binding
> +		in regulator/sky81452-regulator.txt
> +
> +Example:
> +
> +	sky81452@2C {
> +		compatible = "skyworks,sky81452";
> +
> +		backlight {
> +			...
> +		};
> +
> +		regulator {
> +			...
> +		};
> +	};
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index d415b38..ce76e10 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -122,6 +122,7 @@ silabs	Silicon Laboratories
>  simtek
>  sii	Seiko Instruments, Inc.
>  sirf	SiRF Technology, Inc.
> +skyworks	Skyworks Solutions, Inc.
>  smsc	Standard Microsystems Corporation
>  snps 	Synopsys, Inc.
>  spansion	Spansion Inc.
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..acfb2e5 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C=y
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..191c656 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..566912f
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,113 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.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, 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
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_register_devices(struct device *dev,
> +		const struct sky81452_platform_data *pdata)
> +{
> +	struct mfd_cell cells[] = {
> +		{
> +			.name = "sky81452-bl",
> +			.platform_data = pdata->bl_pdata,
> +			.pdata_size = sizeof(*pdata->bl_pdata),
> +		},
> +		{
> +			.name = "sky81452-regulator",
> +			.platform_data = pdata->regulator_init_data,
> +			.pdata_size = sizeof(*pdata->regulator_init_data),
> +		},
> +	};
> +
> +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> +			NULL, 0, NULL);
> +}
> +
> +static int sky81452_probe(struct i2c_client *client,
> +		const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct regmap *map;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	map = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(map))
> +		return PTR_ERR(map);
> +
> +	i2c_set_clientdata(client, map);
> +
> +	return sky81452_register_devices(dev, pdata);
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1.0");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..8d8ed35
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 backlight driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.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, 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
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include "linux/sky81452-backlight.h"
> +#include "linux/regulator/machine.h"
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif
> -- 
> 1.9.1
>