[3/8] drivers/mfd: Add lookup table for Panel Control as GPIO signal
diff mbox

Message ID 1430316005-16480-4-git-send-email-shobhit.kumar@intel.com
State New
Headers show

Commit Message

Shobhit Kumar April 29, 2015, 2 p.m. UTC
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@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/mfd/intel_soc_pmic_core.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Comments

Lee Jones April 29, 2015, 2:27 p.m. UTC | #1
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@linux.intel.com>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Alexandre Courbot <gnurou@gmail.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.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@linaro.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 April 29, 2015, 2:29 p.m. UTC | #2
By the way, your subject lines are messed up.

They should adhere to the conventions laid down by the Maintainers.

`git log --oneline -- drivers/<subsystem>`

> 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@linux.intel.com>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Alexandre Courbot <gnurou@gmail.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
> ---
>  drivers/mfd/intel_soc_pmic_core.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> 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;
Shobhit Kumar April 30, 2015, 7:17 a.m. UTC | #3
On 04/29/2015 07:57 PM, Lee Jones wrote:
> 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@linux.intel.com>
>> Cc: Linus Walleij <linus.walleij@linaro.org>
>> Cc: Alexandre Courbot <gnurou@gmail.com>
>> Cc: Thierry Reding <thierry.reding@gmail.com>
>> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.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.

The CRC PMIC controls the panel enable/disable signal using one of GPIO
like lines. It was agreed by Linus Walleij to go this way. The matching
crystalcove gpio changes are already merged in Linux next as -
http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=e189ca56d91bbf1d3fe2f88ab6858bf919d42adf

This just adds a consumer lookup table for the gpio. Since we do not
have a DT or board files, and since this was part of CRC driver, just
added the lookup table during CRC driver load itself. Same is done for
PWM in a later patch.

Regards
Shobhit

> 
> For my own reference:
>   Acked-by: Lee Jones <lee.jones@linaro.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;
> 
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Linus Walleij May 6, 2015, 2:51 p.m. UTC | #4
On Wed, Apr 29, 2015 at 4:00 PM, Shobhit Kumar <shobhit.kumar@intel.com> 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@linux.intel.com>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Alexandre Courbot <gnurou@gmail.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
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Patch
diff mbox

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;