linux-kernel - Re: [PATCH 3/8] drivers/mfd: Add lookup table for Panel Control as GPIO signal

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Message-ID: <20150429142743.GU9169@x1>
Date:	Wed, 29 Apr 2015 15:27:43 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Shobhit Kumar <shobhit.kumar@...el.com>
Cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-gpio <linux-gpio@...r.kernel.org>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	David Airlie <airlied@...ux.ie>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Povilas Staniulis <wdmonster@...il.com>,
	Chih-Wei Huang <cwhuang@...roid-x86.org>
Subject: Re: [PATCH 3/8] drivers/mfd: Add lookup table for Panel Control as
 GPIO signal

On Wed, 29 Apr 2015, Shobhit Kumar wrote:

> On some Intel SoC platforms, the panel enable/disable signals are
> controlled by CRC PMIC. Add those control as a new GPIO in a lookup
> table for gpio-crystalcove chip during CRC driver load
> 
> v2: Make the lookup table static (Thierry)
>     Remove the lookup table during driver remove (Thierry)
> 
> CC: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Alexandre Courbot <gnurou@...il.com>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@...el.com>
> ---
>  drivers/mfd/intel_soc_pmic_core.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)

I have no idea what this stuff is, but it looks plausible.

For my own reference:
  Acked-by: Lee Jones <lee.jones@...aro.org>

> diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c
> index 7b50b6b..f3d918e 100644
> --- a/drivers/mfd/intel_soc_pmic_core.c
> +++ b/drivers/mfd/intel_soc_pmic_core.c
> @@ -24,8 +24,19 @@
>  #include <linux/acpi.h>
>  #include <linux/regmap.h>
>  #include <linux/mfd/intel_soc_pmic.h>
> +#include <linux/gpio/machine.h>
>  #include "intel_soc_pmic_core.h"
>  
> +/* Lookup table for the Panel Enable/Disable line as GPIO signals */
> +static struct gpiod_lookup_table panel_gpio_table = {
> +	/* Intel GFX is consumer */
> +	.dev_id = "0000:00:02.0",
> +	.table = {
> +		/* Panel EN/DISABLE */
> +		GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
> +	},
> +};
> +
>  static int intel_soc_pmic_find_gpio_irq(struct device *dev)
>  {
>  	struct gpio_desc *desc;
> @@ -85,6 +96,9 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
>  	if (ret)
>  		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
>  
> +	/* Add lookup table binding for Panel Control to the GPIO Chip */
> +	gpiod_add_lookup_table(&panel_gpio_table);
> +
>  	ret = mfd_add_devices(dev, -1, config->cell_dev,
>  			      config->n_cell_devs, NULL, 0,
>  			      regmap_irq_get_domain(pmic->irq_chip_data));
> @@ -104,6 +118,9 @@ static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
>  
>  	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
>  
> +	/* Remove lookup table for Panel Control from the GPIO Chip */
> +	gpiod_remove_lookup_table(&panel_gpio_table);
> +
>  	mfd_remove_devices(&i2c->dev);
>  
>  	return 0;

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