linux-kernel - Re: [PATCH v1 4/8] mfd: intel_quark_i2c_gpio: support devices behind i2c bus

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Message-ID: <20150922222500.GD9317@x1>
Date:	Tue, 22 Sep 2015 23:25:00 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-gpio@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mika Westerberg <mika.westerberg@...el.com>,
	"Puustinen, Ismo" <ismo.puustinen@...el.com>,
	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/8] mfd: intel_quark_i2c_gpio: support devices behind
 i2c bus

On Tue, 22 Sep 2015, Andy Shevchenko wrote:

> On Intel Galileo Gen2 the GPIO expanders are connected to the i2c bus. For
> those devices the ACPI table has specific parameters that refer to an actual
> i2c host controller. Since MFD now copes with that specific configuration we
> have to provide a necessary information how to distinguish devices in ACPI
> namespace. Here the _ADR values are provided.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/intel_quark_i2c_gpio.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Acked-by: Lee Jones <lee.jones@...aro.org>

> diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c
> index 89bd4bf..e9fd33b 100644
> --- a/drivers/mfd/intel_quark_i2c_gpio.c
> +++ b/drivers/mfd/intel_quark_i2c_gpio.c
> @@ -31,6 +31,10 @@
>  #define MFD_I2C_BAR		0
>  #define MFD_GPIO_BAR		1
>  
> +/* ACPI _ADR value to match the child node */
> +#define MFD_ACPI_MATCH_GPIO	0ULL
> +#define MFD_ACPI_MATCH_I2C	1ULL
> +
>  /* The base GPIO number under GPIOLIB framework */
>  #define INTEL_QUARK_MFD_GPIO_BASE	8
>  
> @@ -82,9 +86,14 @@ static struct resource intel_quark_i2c_res[] = {
>  	},
>  };
>  
> +static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
> +	.adr = MFD_ACPI_MATCH_I2C,
> +};
> +
>  static struct mfd_cell intel_quark_mfd_i2c_cell = {
>  	.id = MFD_I2C_BAR,
>  	.name = "i2c_designware",
> +	.acpi_match = &intel_quark_acpi_match_i2c,
>  	.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
>  	.resources = intel_quark_i2c_res,
>  	.ignore_resource_conflicts = true,
> @@ -96,9 +105,14 @@ static struct resource intel_quark_gpio_res[] = {
>  	},
>  };
>  
> +static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
> +	.adr = MFD_ACPI_MATCH_GPIO,
> +};
> +
>  static struct mfd_cell intel_quark_mfd_gpio_cell = {
>  	.id = MFD_GPIO_BAR,
>  	.name = "gpio-dwapb",
> +	.acpi_match = &intel_quark_acpi_match_gpio,
>  	.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
>  	.resources = intel_quark_gpio_res,
>  	.ignore_resource_conflicts = true,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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