linux-kernel - Re: [PATCH v2 3/8] mfd: da9055: Add DT support for PMIC

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Message-ID: <20140207110320.GM14727@lee--X1>
Date:	Fri, 7 Feb 2014 11:03:20 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:	Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v2 3/8] mfd: da9055: Add DT support for PMIC

> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> ---
>  Documentation/devicetree/bindings/mfd/da9055.txt |   73 ++++++++++++++++++++++
>  drivers/mfd/da9055-i2c.c                         |    8 +++

Can you break this up please.

Bindings should be separate to the binding document.

>  2 files changed, 81 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/da9055.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/da9055.txt b/Documentation/devicetree/bindings/mfd/da9055.txt
> new file mode 100644
> index 0000000..f903c3f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/da9055.txt
> @@ -0,0 +1,73 @@
> +* Dialog DA9055 Power Management Integrated Circuit (PMIC)
> +
> +DA9055 consists of a large and varied group of sub-devices (I2C Only):
> +
> +Device			 Supply Names	 Description
> +------			 ------------	 -----------
> +da9055-gpio		:		: GPIOs
> +da9055-regulator	:		: Regulators
> +da9055-onkey		:		: On key
> +da9055-rtc		:		: RTC
> +da9055-hwmon		:		: ADC
> +da9055-watchdog		:		: Watchdog
> +
> +The CODEC device in DA9055 has a separate, configurable I2C address and so
> +is instantiated separately from the PMIC.
> +
> +For details on accompanying CODEC I2C device, see the following:
> +Documentation/devicetree/bindings/sound/da9055.txt
> +
> +======
> +
> +Required properties:
> +- compatible : Should be "dlg,da9055-pmic"
> +- reg: Specifies the I2C slave address (defaults to 0x5a but can be modified)
> +- interrupt-parent: Specifies the phandle of the interrupt controller to which
> +  the IRQs from da9055 are delivered to.
> +- interrupts: IRQ line info for da9055 chip.
> +- interrupt-controller: da9055 has internal IRQs (has own IRQ domain).
> +- #interrupt-cells: Should be 1, is the local IRQ number for da9055.
> +
> +Sub-nodes:
> +- regulators : Contain the regulator nodes. The DA9055 regulators are
> +  bound using their names as listed below:
> +
> +    buck1     : regulator BUCK1
> +    buck2     : regulator BUCK2
> +    ldo1      : regulator LDO1
> +    ldo2      : regulator LDO2
> +    ldo3      : regulator LDO3
> +    ldo4      : regulator LDO4
> +    ldo5      : regulator LDO5
> +    ldo6      : regulator LDO6
> +
> +  The bindings details of individual regulator device can be found in:
> +  Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +
> +Example:
> +
> +	pmic: da9055-pmic@5a {
> +		compatible = "dlg,da9055-pmic";
> +		reg = <0x5a>;
> +		interrupt-parent = <&intc>;
> +		interrupts = <5 0x8>;
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +
> +		regulators {
> +			buck1: BUCK1 {
> +				regulator-min-microvolt = <725000>;
> +				regulator-max-microvolt = <2075000>;
> +			};
> +
> +			buck2: BUCK2 {
> +				regulator-min-microvolt = <925000>;
> +				regulator-max-microvolt = <2500000>;
> +			};
> +			ldo1: LDO1 {
> +				regulator-min-microvolt = <900000>;
> +				regulator-max-microvolt = <3300000>;
> +			};
> +		};
> +	};
> diff --git a/drivers/mfd/da9055-i2c.c b/drivers/mfd/da9055-i2c.c
> index 8103e43..366a3e2 100644
> --- a/drivers/mfd/da9055-i2c.c
> +++ b/drivers/mfd/da9055-i2c.c
> @@ -15,6 +15,8 @@
>  #include <linux/device.h>
>  #include <linux/i2c.h>
>  #include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> 
>  #include <linux/mfd/da9055/core.h>
> 
> @@ -66,6 +68,11 @@ static struct i2c_device_id da9055_i2c_id[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, da9055_i2c_id);
> 
> +static const struct of_device_id da9055_of_match[] = {
> +	{ .compatible = "dlg,da9055-pmic", .data = (void *)&da9055_i2c_id[0] },

Entangling the i2c_device_id table with the of_device_id table sounds
a bit too wacky for my liking. Where do you even use it?

> +	{ }
> +};
> +
>  static struct i2c_driver da9055_i2c_driver = {
>  	.probe = da9055_i2c_probe,
>  	.remove = da9055_i2c_remove,
> @@ -73,6 +80,7 @@ static struct i2c_driver da9055_i2c_driver = {
>  	.driver = {
>  		.name = "da9055-pmic",
>  		.owner = THIS_MODULE,
> +		.of_match_table = of_match_ptr(da9055_of_match),
>  	},
>  };
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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