[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   44 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   12 ++++++++
 2 files changed, 56 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..4f5e0f9 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,50 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	at91_set_A_periph(AT91_PIN_PC0, 0);
+	at91_set_A_periph(AT91_PIN_PC1, 0);
+	at91_set_A_periph(AT91_PIN_PC2, 0);
+	at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..fd373c3 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,16 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels = 4,
+	.adc_clock = 5000000,
+	.startup_time = 10,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +399,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Alexander Stein]

On Wednesday 19 October 2011 18:18:54 Maxime Ripard wrote:
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c
> b/arch/arm/mach-at91/at91sam9260_devices.c index 39f81f4..4f5e0f9 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> [...]
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	at91_set_A_periph(AT91_PIN_PC0, 0);
> +	at91_set_A_periph(AT91_PIN_PC1, 0);
> +	at91_set_A_periph(AT91_PIN_PC2, 0);
> +	at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +
> +

This assumes that all 4 channels are used every time.  How about only using an 
AD channel on PC2 or all but the one on PC1?

Regards,
Alexander

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Thomas Petazzoni]

Le Wed, 19 Oct 2011 18:18:54 +0200,
Maxime Ripard <maxime.ripard@free-electrons.com> a ?crit :

> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	at91_set_A_periph(AT91_PIN_PC0, 0);
> +	at91_set_A_periph(AT91_PIN_PC1, 0);
> +	at91_set_A_periph(AT91_PIN_PC2, 0);
> +	at91_set_A_periph(AT91_PIN_PC3, 0);

As suggested, the decision of which ADC channels are used and therefore
which pins should be muxed to function A is a board-specific decision
and should not be enforced by SoC code.

> +static struct at91_adc_data ek_adc_data = {
> +	.channels = 4,
> +	.adc_clock = 5000000,
> +	.startup_time = 10,
> +};

And on the opposite, those informations are specific to a SoC, not to a
board. So to avoid duplication in all board files, they should be moved
to the corresponding SoC file.

Maybe something like:

#define AT91_ADC_MAX_CHANNELS 8

struct at91_adc_data {
    unsigned int adc_clock;
    u8 channels_used[AT91_ADC_MAX_CHANNELS];
    u8 startup_time;
    u8 channels;
};

at91_add_device_adc() {
	if (data->channels_used[0])
		at91_set_A_periph(AT91_PIN_PC0, 0);
	if (data->channels_used[1])
		at91_set_A_periph(AT91_PIN_PC1, 0);
	if (data->channels_used[2])
		at91_set_A_periph(AT91_PIN_PC2, 0);
	if (data->channels_used[3])
		at91_set_A_periph(AT91_PIN_PC3, 0);
	data->startup_time = ...
	data->channels = ...
	data->adc_clock = ...
}

and the board file would do:

struct at91_adc_data ek_adc_data = {
	.channels_used = { 1, 0, 1, 1 },;
};

Or maybe others have different suggestions ?

Regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Hi,

On 20/10/2011 08:28, Alexander Stein wrote:
> On Wednesday 19 October 2011 18:18:54 Maxime Ripard wrote:
>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c
>> b/arch/arm/mach-at91/at91sam9260_devices.c index 39f81f4..4f5e0f9 100644
>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>> [...]
>> +static struct platform_device at91_adc_device = {
>> +	.name		= "at91adc",
>> +	.id		= -1,
>> +	.dev		= {
>> +				.platform_data		= &adc_data,
>> +	},
>> +	.resource	= adc_resources,
>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>> +};
>> +
>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>> +{
>> +	if (!data)
>> +		return;
>> +
>> +	at91_set_A_periph(AT91_PIN_PC0, 0);
>> +	at91_set_A_periph(AT91_PIN_PC1, 0);
>> +	at91_set_A_periph(AT91_PIN_PC2, 0);
>> +	at91_set_A_periph(AT91_PIN_PC3, 0);
>> +
>> +	adc_data = *data;
>> +	platform_device_register(&at91_adc_device);
>> +}
>> +
>> +
> 
> This assumes that all 4 channels are used every time.  How about only using an 
> AD channel on PC2 or all but the one on PC1?

You're right. I've implemented Thomas suggestion to define the channels
in use in a board specific manner. I need to test my changes and will
submit a new version by monday.

Thanks,

-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   12 +++++++
 2 files changed, 64 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..bfc50ac 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if(data->channels_used[0])
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if(data->channels_used[1])
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if(data->channels_used[2])
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if(data->channels_used[3])
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..6f2542fb 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,16 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = { 1, 1, 1, 1} ,
+	.num_channels_used = 4,
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +399,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Jonathan Cameron]

Forgot to put some general comments in the previous patch reviews.

Please run checkpatch.pl over all patches as it will clean up quite a few
issues.

Mostly looking good.  At the moment it's simple enough that we can
rapidly move this one out of staging once the core has gone.

Then we can build up more interesting stuff as support goes into
the non staging core.

Thanks,

Jonathan

On 11/03/2011 10:11 AM, Maxime Ripard wrote:
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   12 +++++++
>  2 files changed, 64 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..bfc50ac 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */
> +
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if(data->channels_used[0])
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if(data->channels_used[1])
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if(data->channels_used[2])
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if(data->channels_used[3])
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
formatting issues so another one for checkpatch.

Also define AT91_PIN_PC(n) then make this another
for_each_bit_set call.  That should get you down from
8 lines to about 3.
> +
> +	data->adc_clock = 5000000;
> +	data->num_channels = 4;
> +	data->startup_time = 10;
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..6f2542fb 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -314,6 +314,16 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = { 1, 1, 1, 1} ,
> +	.num_channels_used = 4,
> +	.vref = 3300,
> +};
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +399,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Hi Jonathan,

Thanks for your review, I'm working on it and will submit a new version
asap.

On 04/11/2011 11:33, Jonathan Cameron wrote:
> Please run checkpatch.pl over all patches as it will clean up quite a few
> issues.

Yep, I forgot to run it, my bad.

> Mostly looking good.  At the moment it's simple enough that we can
> rapidly move this one out of staging once the core has gone.

Ok. Rebasing on your outofstaging branch for the next version would be a
good idea ?

Or do you want the driver to still go through the staging step ?

Linus, I guess that if we put the driver directly into the main tree you
are ok with the changes made to boards files (code reviews apart) ?

Thanks,
Maxime

> On 11/03/2011 10:11 AM, Maxime Ripard wrote:
>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>> ---
>>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>>  arch/arm/mach-at91/board-sam9g20ek.c     |   12 +++++++
>>  2 files changed, 64 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
>> index 39f81f4..bfc50ac 100644
>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>>  #endif
>>  
>> +/* --------------------------------------------------------------------
>> + *  ADCs
>> + * -------------------------------------------------------------------- */
>> +
>> +static struct at91_adc_data adc_data;
>> +
>> +static struct resource adc_resources[] = {
>> +	[0] = {
>> +		.start	= AT91SAM9260_BASE_ADC,
>> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
>> +		.flags	= IORESOURCE_MEM,
>> +	},
>> +	[1] = {
>> +		.start	= AT91SAM9260_ID_ADC,
>> +		.end	= AT91SAM9260_ID_ADC,
>> +		.flags	= IORESOURCE_IRQ,
>> +	},
>> +};
>> +
>> +static struct platform_device at91_adc_device = {
>> +	.name		= "at91adc",
>> +	.id		= -1,
>> +	.dev		= {
>> +				.platform_data		= &adc_data,
>> +	},
>> +	.resource	= adc_resources,
>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>> +};
>> +
>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>> +{
>> +	if (!data)
>> +		return;
>> +
>> +	if(data->channels_used[0])
>> +		at91_set_A_periph(AT91_PIN_PC0, 0);
>> +	if(data->channels_used[1])
>> +		at91_set_A_periph(AT91_PIN_PC1, 0);
>> +	if(data->channels_used[2])
>> +		at91_set_A_periph(AT91_PIN_PC2, 0);
>> +	if(data->channels_used[3])
>> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> formatting issues so another one for checkpatch.
> 
> Also define AT91_PIN_PC(n) then make this another
> for_each_bit_set call.  That should get you down from
> 8 lines to about 3.
>> +
>> +	data->adc_clock = 5000000;
>> +	data->num_channels = 4;
>> +	data->startup_time = 10;
>> +
>> +	adc_data = *data;
>> +	platform_device_register(&at91_adc_device);
>> +}
>> +
>> +
>>  /* -------------------------------------------------------------------- */
>>  /*
>>   * These devices are always present and don't need any board-specific
>> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
>> index 817f59d..6f2542fb 100644
>> --- a/arch/arm/mach-at91/board-sam9g20ek.c
>> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
>> @@ -314,6 +314,16 @@ static void __init ek_add_device_buttons(void)
>>  static void __init ek_add_device_buttons(void) {}
>>  #endif
>>  
>> +/*
>> + * ADCs
>> + */
>> +
>> +static struct at91_adc_data ek_adc_data = {
>> +	.channels_used = { 1, 1, 1, 1} ,
>> +	.num_channels_used = 4,
>> +	.vref = 3300,
>> +};
>> +
>>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
>> @@ -389,6 +399,8 @@ static void __init ek_board_init(void)
>>  	ek_add_device_gpio_leds();
>>  	/* Push Buttons */
>>  	ek_add_device_buttons();
>> +	/* ADCs */
>> +	at91_add_device_adc(&ek_adc_data);
>>  	/* PCK0 provides MCLK to the WM8731 */
>>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>>  	/* SSC (for WM8731) */
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Linus Walleij]

On Fri, Nov 4, 2011 at 12:25 PM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:

> Ok. Rebasing on your outofstaging branch for the next version would be a
> good idea ?
>
> Or do you want the driver to still go through the staging step ?
>
> Linus, I guess that if we put the driver directly into the main tree you
> are ok with the changes made to boards files (code reviews apart) ?

Yes that's fine.

Linus Walleij

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Jonathan Cameron]

On 11/04/2011 11:25 AM, Maxime Ripard wrote:
> Hi Jonathan,
> 
> Thanks for your review, I'm working on it and will submit a new version
> asap.
> 
> On 04/11/2011 11:33, Jonathan Cameron wrote:
>> Please run checkpatch.pl over all patches as it will clean up quite a few
>> issues.
> 
> Yep, I forgot to run it, my bad.
> 
>> Mostly looking good.  At the moment it's simple enough that we can
>> rapidly move this one out of staging once the core has gone.
> 
> Ok. Rebasing on your outofstaging branch for the next version would be a
> good idea ?
> 
> Or do you want the driver to still go through the staging step ?
I don't really mind.  I doubt Greg would send it on in this merge window
anyway.  Going from one to the other is trivial change of about 4
function names anyway for a simple driver like this.  It probably mostly
depends on whether you want to mess around with the more complex bits
that are going to stay in staging for sometime yet (buffering, in kernel
push interface, events).

> 
> Linus, I guess that if we put the driver directly into the main tree you
> are ok with the changes made to boards files (code reviews apart) ?
> 
> Thanks,
> Maxime
> 
>> On 11/03/2011 10:11 AM, Maxime Ripard wrote:
>>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>>> ---
>>>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>>>  arch/arm/mach-at91/board-sam9g20ek.c     |   12 +++++++
>>>  2 files changed, 64 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
>>> index 39f81f4..bfc50ac 100644
>>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>>> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>>>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>>>  #endif
>>>  
>>> +/* --------------------------------------------------------------------
>>> + *  ADCs
>>> + * -------------------------------------------------------------------- */
>>> +
>>> +static struct at91_adc_data adc_data;
>>> +
>>> +static struct resource adc_resources[] = {
>>> +	[0] = {
>>> +		.start	= AT91SAM9260_BASE_ADC,
>>> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
>>> +		.flags	= IORESOURCE_MEM,
>>> +	},
>>> +	[1] = {
>>> +		.start	= AT91SAM9260_ID_ADC,
>>> +		.end	= AT91SAM9260_ID_ADC,
>>> +		.flags	= IORESOURCE_IRQ,
>>> +	},
>>> +};
>>> +
>>> +static struct platform_device at91_adc_device = {
>>> +	.name		= "at91adc",
>>> +	.id		= -1,
>>> +	.dev		= {
>>> +				.platform_data		= &adc_data,
>>> +	},
>>> +	.resource	= adc_resources,
>>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>>> +};
>>> +
>>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>>> +{
>>> +	if (!data)
>>> +		return;
>>> +
>>> +	if(data->channels_used[0])
>>> +		at91_set_A_periph(AT91_PIN_PC0, 0);
>>> +	if(data->channels_used[1])
>>> +		at91_set_A_periph(AT91_PIN_PC1, 0);
>>> +	if(data->channels_used[2])
>>> +		at91_set_A_periph(AT91_PIN_PC2, 0);
>>> +	if(data->channels_used[3])
>>> +		at91_set_A_periph(AT91_PIN_PC3, 0);
>> formatting issues so another one for checkpatch.
>>
>> Also define AT91_PIN_PC(n) then make this another
>> for_each_bit_set call.  That should get you down from
>> 8 lines to about 3.
>>> +
>>> +	data->adc_clock = 5000000;
>>> +	data->num_channels = 4;
>>> +	data->startup_time = 10;
>>> +
>>> +	adc_data = *data;
>>> +	platform_device_register(&at91_adc_device);
>>> +}
>>> +
>>> +
>>>  /* -------------------------------------------------------------------- */
>>>  /*
>>>   * These devices are always present and don't need any board-specific
>>> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
>>> index 817f59d..6f2542fb 100644
>>> --- a/arch/arm/mach-at91/board-sam9g20ek.c
>>> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
>>> @@ -314,6 +314,16 @@ static void __init ek_add_device_buttons(void)
>>>  static void __init ek_add_device_buttons(void) {}
>>>  #endif
>>>  
>>> +/*
>>> + * ADCs
>>> + */
>>> +
>>> +static struct at91_adc_data ek_adc_data = {
>>> +	.channels_used = { 1, 1, 1, 1} ,
>>> +	.num_channels_used = 4,
>>> +	.vref = 3300,
>>> +};
>>> +
>>>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>>>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>>>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
>>> @@ -389,6 +399,8 @@ static void __init ek_board_init(void)
>>>  	ek_add_device_gpio_leds();
>>>  	/* Push Buttons */
>>>  	ek_add_device_buttons();
>>> +	/* ADCs */
>>> +	at91_add_device_adc(&ek_adc_data);
>>>  	/* PCK0 provides MCLK to the WM8731 */
>>>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>>>  	/* SSC (for WM8731) */
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
> 

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 63 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..0859553 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 63 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..0859553 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Jonathan Cameron]

On 11/09/2011 10:19 AM, Maxime Ripard wrote:
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> 
Fine as far as I am concerned but this one is definitely one for acks
from others as well.
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>  2 files changed, 63 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..0859553 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */
> +
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if (test_bit(0, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if (test_bit(1, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if (test_bit(2, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if (test_bit(3, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	data->adc_clock = 5000000;
> +	data->num_channels = 4;
> +	data->startup_time = 10;
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..e34d41a 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> +	.vref = 3300,
> +};
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 63 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..0859553 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &(data->channels_used)))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Nicolas Ferre]

On 11/14/2011 11:06 AM, Maxime Ripard :
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>


Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

(even if I have a tiny comment: see below)

> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>  2 files changed, 63 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..0859553 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */

What about adding all this only if the IIO_AT91ADC is selected?
Otherwise, you configure pins without actually using them...

> +
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if (test_bit(0, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if (test_bit(1, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if (test_bit(2, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if (test_bit(3, &(data->channels_used)))
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	data->adc_clock = 5000000;
> +	data->num_channels = 4;
> +	data->startup_time = 10;
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..e34d41a 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> +	.vref = 3300,
> +};
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */


-- 
Nicolas Ferre

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Hi Nicolas,

On 14/11/2011 12:29, Nicolas Ferre wrote:
> On 11/14/2011 11:06 AM, Maxime Ripard :
>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>>
>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> 
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> 
> (even if I have a tiny comment: see below)
> 
>> ---
>>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>>  2 files changed, 63 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
>> index 39f81f4..0859553 100644
>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>>  #endif
>>  
>> +/* --------------------------------------------------------------------
>> + *  ADCs
>> + * -------------------------------------------------------------------- */
> 
> What about adding all this only if the IIO_AT91ADC is selected?
> Otherwise, you configure pins without actually using them...

I'm not sure on what I should do here. Should I only wrap the pin
configuration part in the at91_add_device_adc function in an ifdef, or
wrap all there is in this patch (that is structure definitions,
at91_add_device_adc declaration and call, etc) by the ifdef ?

> 
>> +
>> +static struct at91_adc_data adc_data;
>> +
>> +static struct resource adc_resources[] = {
>> +	[0] = {
>> +		.start	= AT91SAM9260_BASE_ADC,
>> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
>> +		.flags	= IORESOURCE_MEM,
>> +	},
>> +	[1] = {
>> +		.start	= AT91SAM9260_ID_ADC,
>> +		.end	= AT91SAM9260_ID_ADC,
>> +		.flags	= IORESOURCE_IRQ,
>> +	},
>> +};
>> +
>> +static struct platform_device at91_adc_device = {
>> +	.name		= "at91adc",
>> +	.id		= -1,
>> +	.dev		= {
>> +				.platform_data		= &adc_data,
>> +	},
>> +	.resource	= adc_resources,
>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>> +};
>> +
>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>> +{
>> +	if (!data)
>> +		return;
>> +
>> +	if (test_bit(0, &(data->channels_used)))
>> +		at91_set_A_periph(AT91_PIN_PC0, 0);
>> +	if (test_bit(1, &(data->channels_used)))
>> +		at91_set_A_periph(AT91_PIN_PC1, 0);
>> +	if (test_bit(2, &(data->channels_used)))
>> +		at91_set_A_periph(AT91_PIN_PC2, 0);
>> +	if (test_bit(3, &(data->channels_used)))
>> +		at91_set_A_periph(AT91_PIN_PC3, 0);
>> +
>> +	data->adc_clock = 5000000;
>> +	data->num_channels = 4;
>> +	data->startup_time = 10;
>> +
>> +	adc_data = *data;
>> +	platform_device_register(&at91_adc_device);
>> +}
>> +
>> +
>>  /* -------------------------------------------------------------------- */
>>  /*
>>   * These devices are always present and don't need any board-specific
>> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
>> index 817f59d..e34d41a 100644
>> --- a/arch/arm/mach-at91/board-sam9g20ek.c
>> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
>> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>>  static void __init ek_add_device_buttons(void) {}
>>  #endif
>>  
>> +/*
>> + * ADCs
>> + */
>> +
>> +static struct at91_adc_data ek_adc_data = {
>> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
>> +	.vref = 3300,
>> +};
>> +
>>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
>> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>>  	ek_add_device_gpio_leds();
>>  	/* Push Buttons */
>>  	ek_add_device_buttons();
>> +	/* ADCs */
>> +	at91_add_device_adc(&ek_adc_data);
>>  	/* PCK0 provides MCLK to the WM8731 */
>>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>>  	/* SSC (for WM8731) */
> 
> 


-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Nicolas Ferre]

On 11/14/2011 04:17 PM, Maxime Ripard :
> Hi Nicolas,
> 
> On 14/11/2011 12:29, Nicolas Ferre wrote:
>> On 11/14/2011 11:06 AM, Maxime Ripard :
>>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>>> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>>>
>>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>>
>>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
>>
>> (even if I have a tiny comment: see below)
>>
>>> ---
>>>  arch/arm/mach-at91/at91sam9260_devices.c |   52 ++++++++++++++++++++++++++++++
>>>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>>>  2 files changed, 63 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
>>> index 39f81f4..0859553 100644
>>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>>> @@ -1312,6 +1312,58 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>>>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>>>  #endif
>>>  
>>> +/* --------------------------------------------------------------------
>>> + *  ADCs
>>> + * -------------------------------------------------------------------- */
>>
>> What about adding all this only if the IIO_AT91ADC is selected?
>> Otherwise, you configure pins without actually using them...
> 
> I'm not sure on what I should do here. Should I only wrap the pin
> configuration part in the at91_add_device_adc function in an ifdef, or
> wrap all there is in this patch (that is structure definitions,
> at91_add_device_adc declaration and call, etc) by the ifdef ?

I mean all adc material surrounded by ifdefs with empty function call if
not selected. I was only talking about the pin configuration because the
additional structure size is not so much a big deal.

>>> +
>>> +static struct at91_adc_data adc_data;
>>> +
>>> +static struct resource adc_resources[] = {
>>> +	[0] = {
>>> +		.start	= AT91SAM9260_BASE_ADC,
>>> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
>>> +		.flags	= IORESOURCE_MEM,
>>> +	},
>>> +	[1] = {
>>> +		.start	= AT91SAM9260_ID_ADC,
>>> +		.end	= AT91SAM9260_ID_ADC,
>>> +		.flags	= IORESOURCE_IRQ,
>>> +	},
>>> +};
>>> +
>>> +static struct platform_device at91_adc_device = {
>>> +	.name		= "at91adc",
>>> +	.id		= -1,
>>> +	.dev		= {
>>> +				.platform_data		= &adc_data,
>>> +	},
>>> +	.resource	= adc_resources,
>>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>>> +};
>>> +
>>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>>> +{
>>> +	if (!data)
>>> +		return;
>>> +
>>> +	if (test_bit(0, &(data->channels_used)))
>>> +		at91_set_A_periph(AT91_PIN_PC0, 0);
>>> +	if (test_bit(1, &(data->channels_used)))
>>> +		at91_set_A_periph(AT91_PIN_PC1, 0);
>>> +	if (test_bit(2, &(data->channels_used)))
>>> +		at91_set_A_periph(AT91_PIN_PC2, 0);
>>> +	if (test_bit(3, &(data->channels_used)))
>>> +		at91_set_A_periph(AT91_PIN_PC3, 0);
>>> +
>>> +	data->adc_clock = 5000000;
>>> +	data->num_channels = 4;
>>> +	data->startup_time = 10;
>>> +
>>> +	adc_data = *data;
>>> +	platform_device_register(&at91_adc_device);
>>> +}
>>> +
>>> +
>>>  /* -------------------------------------------------------------------- */
>>>  /*
>>>   * These devices are always present and don't need any board-specific
>>> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
>>> index 817f59d..e34d41a 100644
>>> --- a/arch/arm/mach-at91/board-sam9g20ek.c
>>> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
>>> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>>>  static void __init ek_add_device_buttons(void) {}
>>>  #endif
>>>  
>>> +/*
>>> + * ADCs
>>> + */
>>> +
>>> +static struct at91_adc_data ek_adc_data = {
>>> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
>>> +	.vref = 3300,
>>> +};
>>> +
>>>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>>>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>>>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
>>> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>>>  	ek_add_device_gpio_leds();
>>>  	/* Push Buttons */
>>>  	ek_add_device_buttons();
>>> +	/* ADCs */
>>> +	at91_add_device_adc(&ek_adc_data);
>>>  	/* PCK0 provides MCLK to the WM8731 */
>>>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>>>  	/* SSC (for WM8731) */


Bye,
-- 
Nicolas Ferre

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3b754ba 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Jonathan Cameron]

On 11/14/2011 05:30 PM, Maxime Ripard wrote:
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> 
I'm happy with this, but the question comes of how to merge it with
minimal conflicts.  Clearly 2/3 is entirely in IIO so easy enough
but is dependent on 1/3.  3/3 is entirely in the at91 maintainers
domain but is also dependent on 1/3.

What do people what to do?
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>  2 files changed, 66 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..3b754ba 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */
> +
> +#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if (test_bit(0, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if (test_bit(1, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if (test_bit(2, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if (test_bit(3, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	data->adc_clock = 5000000;
> +	data->num_channels = 4;
> +	data->startup_time = 10;
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +#else
> +void __init at91_add_device_adc(struct at91_adc_data *data) {}
> +#endif
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..e34d41a 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> +	.vref = 3300,
> +};
Feels like this should be marked as __initdata given it gets copied
in the below function?
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

On 14/11/2011 21:34, Jonathan Cameron wrote:
> On 11/14/2011 05:30 PM, Maxime Ripard wrote:
>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>>
> I'm happy with this, but the question comes of how to merge it with
> minimal conflicts.  Clearly 2/3 is entirely in IIO so easy enough
> but is dependent on 1/3.  3/3 is entirely in the at91 maintainers
> domain but is also dependent on 1/3.
> 
> What do people what to do?

It will surely be non trivial to merge. As you said, 2/3 and 3/3 depends
on 1/3. But 2/3 also depends on the patchset to move out of staging the
iio core you posted.


>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
>> ---
>>  arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
>>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>>  2 files changed, 66 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
>> index 39f81f4..3b754ba 100644
>> --- a/arch/arm/mach-at91/at91sam9260_devices.c
>> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
>> @@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>>  #endif
>>  
>> +/* --------------------------------------------------------------------
>> + *  ADCs
>> + * -------------------------------------------------------------------- */
>> +
>> +#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
>> +static struct at91_adc_data adc_data;
>> +
>> +static struct resource adc_resources[] = {
>> +	[0] = {
>> +		.start	= AT91SAM9260_BASE_ADC,
>> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
>> +		.flags	= IORESOURCE_MEM,
>> +	},
>> +	[1] = {
>> +		.start	= AT91SAM9260_ID_ADC,
>> +		.end	= AT91SAM9260_ID_ADC,
>> +		.flags	= IORESOURCE_IRQ,
>> +	},
>> +};
>> +
>> +static struct platform_device at91_adc_device = {
>> +	.name		= "at91adc",
>> +	.id		= -1,
>> +	.dev		= {
>> +				.platform_data		= &adc_data,
>> +	},
>> +	.resource	= adc_resources,
>> +	.num_resources	= ARRAY_SIZE(adc_resources),
>> +};
>> +
>> +void __init at91_add_device_adc(struct at91_adc_data *data)
>> +{
>> +	if (!data)
>> +		return;
>> +
>> +	if (test_bit(0, &data->channels_used))
>> +		at91_set_A_periph(AT91_PIN_PC0, 0);
>> +	if (test_bit(1, &data->channels_used))
>> +		at91_set_A_periph(AT91_PIN_PC1, 0);
>> +	if (test_bit(2, &data->channels_used))
>> +		at91_set_A_periph(AT91_PIN_PC2, 0);
>> +	if (test_bit(3, &data->channels_used))
>> +		at91_set_A_periph(AT91_PIN_PC3, 0);
>> +
>> +	data->adc_clock = 5000000;
>> +	data->num_channels = 4;
>> +	data->startup_time = 10;
>> +
>> +	adc_data = *data;
>> +	platform_device_register(&at91_adc_device);
>> +}
>> +#else
>> +void __init at91_add_device_adc(struct at91_adc_data *data) {}
>> +#endif
>> +
>>  /* -------------------------------------------------------------------- */
>>  /*
>>   * These devices are always present and don't need any board-specific
>> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
>> index 817f59d..e34d41a 100644
>> --- a/arch/arm/mach-at91/board-sam9g20ek.c
>> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
>> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>>  static void __init ek_add_device_buttons(void) {}
>>  #endif
>>  
>> +/*
>> + * ADCs
>> + */
>> +
>> +static struct at91_adc_data ek_adc_data = {
>> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
>> +	.vref = 3300,
>> +};
> Feels like this should be marked as __initdata given it gets copied
> in the below function?
>> +
>>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
>> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>>  	ek_add_device_gpio_leds();
>>  	/* Push Buttons */
>>  	ek_add_device_buttons();
>> +	/* ADCs */
>> +	at91_add_device_adc(&ek_adc_data);
>>  	/* PCK0 provides MCLK to the WM8731 */
>>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>>  	/* SSC (for WM8731) */
> 


-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3b754ba 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3b754ba 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3b754ba 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	data->adc_clock = 5000000;
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..e34d41a 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +398,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Jean-Christophe PLAGNIOL-VILLARD]

On 12:27 Thu 24 Nov     , Maxime Ripard wrote:
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
please update and u get
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>


no need to Cc if sob

ditto for all patch
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   55 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   11 ++++++
>  2 files changed, 66 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..3b754ba 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1312,6 +1312,61 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */
> +
> +#if defined(CONFIG_IIO_AT91ADC) || defined(CONFIG_IIO_AT91ADC_MODULE)
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91adc",
at91_adc please
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if (test_bit(0, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if (test_bit(1, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if (test_bit(2, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if (test_bit(3, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	data->adc_clock = 5000000;
please put a comment here for the clock
> +	data->num_channels = 4;
> +	data->startup_time = 10;
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +#else
> +void __init at91_add_device_adc(struct at91_adc_data *data) {}
> +#endif
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..e34d41a 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -314,6 +314,15 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif

Best Regards,
J.
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> +	.vref = 3300,
> +};
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +398,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */
> -- 
> 1.7.4.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Fabio Estevam]

On Thu, Nov 24, 2011 at 9:27 AM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:

> +static struct at91_adc_data ek_adc_data = {
> + ? ? ? .channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> + ? ? ? .vref = 3300,
> +};

Don't you need to also pass adc_clock?

Otherwise the probe code will fail:

+
+	if (!pdata->adc_clock) {
+		dev_err(&pdev->dev, "No ADCClock available.\n");
+		ret = -EINVAL;
+		goto error_free_clk;
+	}

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Hi,

On 24/11/2011 16:20, Fabio Estevam wrote:
> On Thu, Nov 24, 2011 at 9:27 AM, Maxime Ripard
> <maxime.ripard@free-electrons.com> wrote:
> 
>> +static struct at91_adc_data ek_adc_data = {
>> +       .channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
>> +       .vref = 3300,
>> +};
> 
> Don't you need to also pass adc_clock?

ADC Clock is SoC specific, while these variables are board-specific. It
is thus set in the file arch/arm/mach-at91/at91sam9260_devices.c, in the
same patch.

Maxime

-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   62 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   13 ++++++
 2 files changed, 75 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..012992b 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/i2c-gpio.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/board.h>
 #include <mach/gpio.h>
 #include <mach/cpu.h>
@@ -1312,6 +1314,66 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91_ADC) || defined(CONFIG_IIO_AT91_ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91_adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	/*
+	 * The electrical characteristics part of the AT91SAM9G20 datasheet
+	 * sets the ADC clock to 5MHz.
+	 */
+	data->adc_clock = 5000000;
+
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..29dae9f 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -31,6 +31,8 @@
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/hardware.h>
 #include <asm/setup.h>
 #include <asm/mach-types.h>
@@ -314,6 +316,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +400,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   62 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   13 ++++++
 2 files changed, 75 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..012992b 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/i2c-gpio.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/board.h>
 #include <mach/gpio.h>
 #include <mach/cpu.h>
@@ -1312,6 +1314,66 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91_ADC) || defined(CONFIG_IIO_AT91_ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91_adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	/*
+	 * The electrical characteristics part of the AT91SAM9G20 datasheet
+	 * sets the ADC clock to 5MHz.
+	 */
+	data->adc_clock = 5000000;
+
+	data->num_channels = 4;
+	data->startup_time = 10;
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..29dae9f 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -31,6 +31,8 @@
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/hardware.h>
 #include <asm/setup.h>
 #include <asm/mach-types.h>
@@ -314,6 +316,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +400,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   53 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   13 +++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3598540 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/i2c-gpio.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/board.h>
 #include <mach/gpio.h>
 #include <mach/cpu.h>
@@ -1312,6 +1314,57 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91_ADC) || defined(CONFIG_IIO_AT91_ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91_adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..29dae9f 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -31,6 +31,8 @@
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/hardware.h>
 #include <asm/setup.h>
 #include <asm/mach-types.h>
@@ -314,6 +316,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +400,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.4.1

[PATCH RESEND v13] AT91: Add a driver for the ADC

[Maxime Ripard]

Hi,

Working on supporting the hardware triggers for these drivers, I made some
patches that Jonathan suggested I merge with this patchset.

So, basically, what changed from v12:
  * Indentation fixes, added some comments
  * Rework of the platform data. Now the SoC-specific data are directly in the
driver, as it was kind of odd to declare all the triggers for the driver in the
SoC files. So the driver handles all of this now. It has nice side effects, as
it will also ease the transition to DT.

As it introduce heavy changes, I dropped the Acked-by and Signed-off-by from
the two last patches.

Maxime

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

[PATCH 1/3] ARM: AT91: Add platform data for the ADCs

[Maxime Ripard]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 include/linux/platform_data/at91_adc.h |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
 create mode 100644 include/linux/platform_data/at91_adc.h

diff --git a/include/linux/platform_data/at91_adc.h b/include/linux/platform_data/at91_adc.h
new file mode 100644
index 0000000..c27b502
--- /dev/null
+++ b/include/linux/platform_data/at91_adc.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2011 Free Electrons
+ *
+ * Licensed under the GPLv2 or later.
+ *
+ */
+
+#ifndef _AT91_ADC_H_
+#define _AT91_ADC_H_
+
+/**
+ * struct at91_adc_data - platform data for ADC driver
+ * @channels_use:	channels in use on the board as a bitmask
+ * @vref:		Reference voltage for the ADC in millivolts
+ */
+struct at91_adc_data {
+	unsigned long	channels_used;
+	u16		vref;
+};
+
+extern void __init at91_add_device_adc(struct at91_adc_data *data);
+
+#endif
-- 
1.7.5.4

[PATCH 2/3] ARM: AT91: IIO: Add AT91 ADC driver.

[Maxime Ripard]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
---
 drivers/iio/adc/Kconfig    |    6 +
 drivers/iio/adc/Makefile   |    4 +-
 drivers/iio/adc/at91_adc.c |  377 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 386 insertions(+), 1 deletions(-)
 create mode 100644 drivers/iio/adc/at91_adc.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 3d97b21..02ed274 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -14,6 +14,12 @@ config IIO_AD799X
 	  i2c analog to digital convertors (ADC). Provides direct access
 	  via sysfs.
 
+config IIO_AT91_ADC
+	tristate "Atmel AT91 ADC"
+	depends on SYSFS && ARCH_AT91
+	help
+	  Say yes here to build support for Atmel AT91 ADC.
+
 config IIO_MAX1363
 	tristate "Maxim max1363 ADC driver"
 	depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index c197334..50ceaab7 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -6,4 +6,6 @@ iio_ad799x-y := ad799x_core.o
 obj-$(CONFIG_IIO_AD799X) += iio_ad799x.o
 
 iio_max1363-y := max1363_core.o
-obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
\ No newline at end of file
+obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
+
+obj-$(CONFIG_IIO_AT91_ADC) += at91_adc.o
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
new file mode 100644
index 0000000..34d2b29
--- /dev/null
+++ b/drivers/iio/adc/at91_adc.c
@@ -0,0 +1,377 @@
+/*
+ * Driver for the ADC present in the Atmel AT91 evaluation boards.
+ *
+ * Copyright 2011 Free Electrons
+ *
+ * Licensed under the GPLv2 or later.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+
+#include <linux/iio/iio.h>
+#include <linux/platform_data/at91_adc.h>
+
+#include <mach/at91_adc.h>
+#include <mach/cpu.h>
+
+/**
+ * struct at91_adc_desc - description of the ADC on the board
+ * @clock:		ADC clock as specified by the datasheet, in Hz.
+ * @num_channels:	global number of channels available on the board (to
+			specify which channels are indeed in use on the
+			board, see the channels_used bitmask in the platform
+			data)
+ * @startup_time:	startup time of the ADC in microseconds
+ */
+struct at91_adc_desc {
+	u32			clock;
+	u8			num_channels;
+	u8			startup_time;
+};
+
+struct at91_adc_state {
+	unsigned long		channels_mask;
+	struct clk		*clk;
+	bool			done;
+	struct at91_adc_desc	*desc;
+	int			irq;
+	u16			last_value;
+	struct mutex		lock;
+	void __iomem		*reg_base;
+	u32			vref_mv;
+	wait_queue_head_t	wq_data_avail;
+};
+
+static struct at91_adc_desc at91_adc_desc_sam9g20 = {
+	.clock = 5000000,
+	.num_channels = 4,
+	.startup_time = 10,
+};
+
+static int at91_adc_select_soc(struct at91_adc_state *st)
+{
+	if (cpu_is_at91sam9g20()) {
+		st->desc = &at91_adc_desc_sam9g20;
+		return 0;
+	}
+
+	return -ENODEV;
+}
+
+static inline u32 at91_adc_reg_read(struct at91_adc_state *st,
+				    u8 reg)
+{
+	return readl_relaxed(st->reg_base + reg);
+}
+
+static inline void at91_adc_reg_write(struct at91_adc_state *st,
+				      u8 reg,
+				      u32 val)
+{
+	writel_relaxed(val, st->reg_base + reg);
+}
+
+static irqreturn_t at91_adc_eoc_trigger(int irq, void *private)
+{
+	struct iio_dev *idev = private;
+	struct at91_adc_state *st = iio_priv(idev);
+	unsigned int status = at91_adc_reg_read(st, AT91_ADC_SR);
+
+	if (!(status & AT91_ADC_DRDY))
+		return IRQ_HANDLED;
+
+	if (status & st->channels_mask) {
+		st->done = true;
+		st->last_value = at91_adc_reg_read(st, AT91_ADC_LCDR);
+	}
+
+	wake_up_interruptible(&st->wq_data_avail);
+
+	return IRQ_HANDLED;
+}
+
+static int at91_adc_channel_init(struct iio_dev *idev,
+				 struct at91_adc_data *pdata)
+{
+	struct at91_adc_state *st = iio_priv(idev);
+	struct iio_chan_spec *chan_array;
+	int bit, idx = 0;
+
+	idev->num_channels = bitmap_weight(&pdata->channels_used,
+					   st->desc->num_channels);
+	chan_array = kcalloc(idev->num_channels, sizeof(struct iio_chan_spec),
+			     GFP_KERNEL);
+
+	if (chan_array == NULL)
+		return -ENOMEM;
+
+	for_each_set_bit(bit, &pdata->channels_used, st->desc->num_channels) {
+		struct iio_chan_spec *chan = chan_array + idx;
+		chan->type = IIO_VOLTAGE;
+		chan->indexed = 1;
+		chan->channel = bit;
+		chan->scan_type.sign = 'u';
+		chan->scan_type.realbits = 10;
+		chan->info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT;
+		idx++;
+	}
+
+	idev->channels = chan_array;
+	return idev->num_channels;
+}
+
+static void at91_adc_channel_remove(struct iio_dev *idev)
+{
+	kfree(idev->channels);
+}
+
+static int at91_adc_read_raw(struct iio_dev *idev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	struct at91_adc_state *st = iio_priv(idev);
+	int ret;
+
+	switch (mask) {
+	case 0:
+		mutex_lock(&st->lock);
+
+		at91_adc_reg_write(st, AT91_ADC_CHER,
+				  AT91_ADC_CH(chan->channel));
+		at91_adc_reg_write(st, AT91_ADC_IER,
+				  AT91_ADC_EOC(chan->channel));
+		at91_adc_reg_write(st, AT91_ADC_CR, AT91_ADC_START);
+
+		ret = wait_event_interruptible_timeout(st->wq_data_avail,
+						       st->done,
+						       msecs_to_jiffies(1000));
+		if (ret == 0)
+			return -ETIMEDOUT;
+		else if (ret < 0)
+			return ret;
+
+		*val = st->last_value;
+
+		at91_adc_reg_write(st, AT91_ADC_CHDR,
+				  AT91_ADC_CH(chan->channel));
+		at91_adc_reg_write(st, AT91_ADC_IDR,
+				  AT91_ADC_EOC(chan->channel));
+
+		st->last_value = 0;
+		st->done = false;
+		mutex_unlock(&st->lock);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = (st->vref_mv * 1000) >> chan->scan_type.realbits;
+		*val2 = 0;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		break;
+	}
+	return -EINVAL;
+}
+
+static const struct iio_info at91_adc_info = {
+	.driver_module = THIS_MODULE,
+	.read_raw = &at91_adc_read_raw,
+};
+
+static int __devinit at91_adc_probe(struct platform_device *pdev)
+{
+	unsigned int prsc, mstrclk, ticks;
+	int ret;
+	struct iio_dev *idev;
+	struct at91_adc_state *st;
+	struct resource *res;
+	struct at91_adc_data *pdata = pdev->dev.platform_data;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "No resource defined\n");
+		ret = -ENXIO;
+		goto error_ret;
+	}
+
+	idev = iio_device_allocate(sizeof(struct at91_adc_state));
+	if (idev == NULL) {
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+
+	platform_set_drvdata(pdev, idev);
+
+	idev->dev.parent = &pdev->dev;
+	idev->name = dev_name(&pdev->dev);
+	idev->info = &at91_adc_info;
+
+	st = iio_priv(idev);
+	ret = at91_adc_select_soc(st);
+	if (ret) {
+		dev_err(&pdev->dev, "SoC unknown\n");
+		goto error_free_device;
+	}
+
+	st->irq = platform_get_irq(pdev, 0);
+	if (st->irq < 0) {
+		dev_err(&pdev->dev, "No IRQ ID is designated\n");
+		ret = -ENODEV;
+		goto error_free_device;
+	}
+
+	if (!request_mem_region(res->start, resource_size(res),
+				"AT91 adc registers")) {
+		dev_err(&pdev->dev, "Resources are unavailable.\n");
+		ret = -EBUSY;
+		goto error_free_device;
+	}
+
+	st->reg_base = ioremap(res->start, resource_size(res));
+	if (!st->reg_base) {
+		dev_err(&pdev->dev, "Failed to map registers.\n");
+		ret = -ENOMEM;
+		goto error_release_mem;
+	}
+
+	/*
+	 * Disable all IRQs before setting up the handler
+	 */
+	at91_adc_reg_write(st, AT91_ADC_CR, AT91_ADC_SWRST);
+	at91_adc_reg_write(st, AT91_ADC_IDR, 0xFFFFFFFF);
+	ret = request_irq(st->irq,
+			  at91_adc_eoc_trigger,
+			  0,
+			  pdev->dev.driver->name,
+			  idev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
+		goto error_unmap_reg;
+	}
+
+	st->clk = clk_get(&pdev->dev, "adc_clk");
+	if (IS_ERR(st->clk)) {
+		dev_err(&pdev->dev, "Failed to get the clock.\n");
+		ret = PTR_ERR(st->clk);
+		goto error_free_irq;
+	}
+
+	clk_enable(st->clk);
+	mstrclk = clk_get_rate(st->clk);
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data available.\n");
+		ret = -EINVAL;
+		goto error_free_clk;
+	}
+
+	if (!st->desc->clock) {
+		dev_err(&pdev->dev, "No ADCClock available.\n");
+		ret = -EINVAL;
+		goto error_free_clk;
+	}
+
+	/*
+	 * Prescaler rate computation using the formula from the Atmel's
+	 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being
+	 * specified by the electrical characteristics of the board.
+	 */
+	prsc = (mstrclk / (2 * st->desc->clock)) - 1;
+
+	if (!st->desc->startup_time) {
+		dev_err(&pdev->dev, "No startup time available.\n");
+		ret = -EINVAL;
+		goto error_free_clk;
+	}
+
+	/*
+	 * Number of ticks needed to cover the startup time of the ADC as
+	 * defined in the electrical characteristics of the board, divided by 8.
+	 * The formula thus is : Startup Time = (ticks + 1) * 8 / ADC Clock
+	 */
+	ticks = round_up((st->desc->startup_time * st->desc->clock /
+			  1000000) - 1, 8) / 8;
+	at91_adc_reg_write(st, AT91_ADC_MR,
+			  (AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |
+			  (AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));
+
+	/* Setup the ADC channels available on the board */
+	ret = at91_adc_channel_init(idev, pdata);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Couldn't initialize the channels.\n");
+		goto error_free_clk;
+	}
+
+	init_waitqueue_head(&st->wq_data_avail);
+	mutex_init(&st->lock);
+
+	st->vref_mv = pdata->vref;
+	st->channels_mask = pdata->channels_used;
+
+	ret = iio_device_register(idev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Couldn't register the device.\n");
+		goto error_free_channels;
+	}
+
+	return 0;
+
+error_free_channels:
+	at91_adc_channel_remove(idev);
+error_free_clk:
+	clk_disable(st->clk);
+	clk_put(st->clk);
+error_free_irq:
+	free_irq(st->irq, idev);
+error_unmap_reg:
+	iounmap(st->reg_base);
+error_release_mem:
+	release_mem_region(res->start, resource_size(res));
+error_free_device:
+	iio_device_free(idev);
+error_ret:
+	return ret;
+}
+
+static int __devexit at91_adc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *idev = platform_get_drvdata(pdev);
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct at91_adc_state *st = iio_priv(idev);
+
+	iio_device_unregister(idev);
+	at91_adc_channel_remove(idev);
+	clk_disable(st->clk);
+	clk_put(st->clk);
+	free_irq(st->irq, idev);
+	iounmap(st->reg_base);
+	release_mem_region(res->start, resource_size(res));
+	iio_device_free(idev);
+
+	return 0;
+}
+
+static struct platform_driver at91_adc_driver = {
+	.probe = at91_adc_probe,
+	.remove = __devexit_p(at91_adc_remove),
+	.driver = {
+		   .name = "at91_adc",
+	},
+};
+
+module_platform_driver(at91_adc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Atmel AT91 ADC Driver");
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
-- 
1.7.5.4

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Maxime Ripard]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 arch/arm/mach-at91/at91sam9260_devices.c |   53 ++++++++++++++++++++++++++++++
 arch/arm/mach-at91/board-sam9g20ek.c     |   13 +++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 39f81f4..3598540 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/i2c-gpio.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/board.h>
 #include <mach/gpio.h>
 #include <mach/cpu.h>
@@ -1312,6 +1314,57 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
 void __init at91_add_device_cf(struct at91_cf_data * data) {}
 #endif
 
+/* --------------------------------------------------------------------
+ *  ADCs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_IIO_AT91_ADC) || defined(CONFIG_IIO_AT91_ADC_MODULE)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+	[0] = {
+		.start	= AT91SAM9260_BASE_ADC,
+		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91SAM9260_ID_ADC,
+		.end	= AT91SAM9260_ID_ADC,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91_adc_device = {
+	.name		= "at91_adc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &adc_data,
+	},
+	.resource	= adc_resources,
+	.num_resources	= ARRAY_SIZE(adc_resources),
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+	if (!data)
+		return;
+
+	if (test_bit(0, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC0, 0);
+	if (test_bit(1, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC1, 0);
+	if (test_bit(2, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC2, 0);
+	if (test_bit(3, &data->channels_used))
+		at91_set_A_periph(AT91_PIN_PC3, 0);
+
+	adc_data = *data;
+	platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
 /* -------------------------------------------------------------------- */
 /*
  * These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 817f59d..29dae9f 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -31,6 +31,8 @@
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/hardware.h>
 #include <asm/setup.h>
 #include <asm/mach-types.h>
@@ -314,6 +316,15 @@ static void __init ek_add_device_buttons(void)
 static void __init ek_add_device_buttons(void) {}
 #endif
 
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+	.vref = 3300,
+};
+
 #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
 static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
 	REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -389,6 +400,8 @@ static void __init ek_board_init(void)
 	ek_add_device_gpio_leds();
 	/* Push Buttons */
 	ek_add_device_buttons();
+	/* ADCs */
+	at91_add_device_adc(&ek_adc_data);
 	/* PCK0 provides MCLK to the WM8731 */
 	at91_set_B_periph(AT91_PIN_PC1, 0);
 	/* SSC (for WM8731) */
-- 
1.7.5.4

[PATCH 2/3] ARM: AT91: IIO: Add AT91 ADC driver.

[Arnd Bergmann]

On Monday 16 January 2012, Maxime Ripard wrote:
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> 
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Jonathan Cameron <jic23@cam.ac.uk>
> Cc: Marek Vasut <marek.vasut@gmail.com>
> Cc: Arnd Bergmann <arnd@arndb.de>

I think I reviewed this driver before, but I don't remember any of the
details I may have complained about. I assume everything was fixed,
since the driver looks good in this version ;-)

Acked-by: Arnd Bergmann <arnd@arndb.de>

Two general comments:

* Please add a changeset description (i.e. thetext above your
Signed-off-by: line) for every patch you do. Just read a few
dozen patches that get posted to lkml to get a feeling for
what would be useful to have in there. For a new driver, it
would be helpful to know what hardware uses this driver and
what the device does there.

* Over time, we will get stricter in requiring device tree
bindings for new platform devices, to replace platform_data
where appropriate. It's not required yet, but it would be nice
to describe the long-term plan in submissions that add new
platform_data but no device tree bindings.

	Arnd

[PATCH 2/3] ARM: AT91: IIO: Add AT91 ADC driver.

[Maxime Ripard]

Hi Arnd,

On 17/01/2012 18:35, Arnd Bergmann wrote:
> On Monday 16 January 2012, Maxime Ripard wrote:
>> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>>
>> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
>> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>> Cc: Jonathan Cameron <jic23@cam.ac.uk>
>> Cc: Marek Vasut <marek.vasut@gmail.com>
>> Cc: Arnd Bergmann <arnd@arndb.de>
> 
> I think I reviewed this driver before, but I don't remember any of the
> details I may have complained about. I assume everything was fixed,
> since the driver looks good in this version ;-)

You did, and as far as I remember, you did not complained much. but
actually, I've rewritten a large enough part of this driver to make the
Acked-by you gave at the time at best outdated. That's why I dropped all
the SoB and friends to a Cc.

I mentionned it in the cover letter, but I forgot to Cc you one that one
too, my bad...

> Acked-by: Arnd Bergmann <arnd@arndb.de>
> 
> Two general comments:
> 
> * Please add a changeset description (i.e. thetext above your
> Signed-off-by: line) for every patch you do. Just read a few
> dozen patches that get posted to lkml to get a feeling for
> what would be useful to have in there. For a new driver, it
> would be helpful to know what hardware uses this driver and
> what the device does there.

Ok, will do.

> * Over time, we will get stricter in requiring device tree
> bindings for new platform devices, to replace platform_data
> where appropriate. It's not required yet, but it would be nice
> to describe the long-term plan in submissions that add new
> platform_data but no device tree bindings.

The main point of rewriting a part of it was exactly to make the
transition to device-tree and single kernel image easier when the time
comes.

Maxime

-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 2/3] ARM: AT91: IIO: Add AT91 ADC driver.

[Nicolas Ferre]

On 01/16/2012 10:36 PM, Maxime Ripard :
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> 
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>

You can add my:

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Jonathan Cameron <jic23@cam.ac.uk>
> Cc: Marek Vasut <marek.vasut@gmail.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/iio/adc/Kconfig    |    6 +
>  drivers/iio/adc/Makefile   |    4 +-
>  drivers/iio/adc/at91_adc.c |  377 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 386 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/iio/adc/at91_adc.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 3d97b21..02ed274 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -14,6 +14,12 @@ config IIO_AD799X
>  	  i2c analog to digital convertors (ADC). Provides direct access
>  	  via sysfs.
>  
> +config IIO_AT91_ADC
> +	tristate "Atmel AT91 ADC"
> +	depends on SYSFS && ARCH_AT91
> +	help
> +	  Say yes here to build support for Atmel AT91 ADC.
> +
>  config IIO_MAX1363
>  	tristate "Maxim max1363 ADC driver"
>  	depends on I2C
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index c197334..50ceaab7 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -6,4 +6,6 @@ iio_ad799x-y := ad799x_core.o
>  obj-$(CONFIG_IIO_AD799X) += iio_ad799x.o
>  
>  iio_max1363-y := max1363_core.o
> -obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
> \ No newline at end of file
> +obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
> +
> +obj-$(CONFIG_IIO_AT91_ADC) += at91_adc.o
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> new file mode 100644
> index 0000000..34d2b29
> --- /dev/null
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -0,0 +1,377 @@
> +/*
> + * Driver for the ADC present in the Atmel AT91 evaluation boards.
> + *
> + * Copyright 2011 Free Electrons
> + *
> + * Licensed under the GPLv2 or later.
> + */
> +
> +#include <linux/bitmap.h>
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/wait.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/platform_data/at91_adc.h>
> +
> +#include <mach/at91_adc.h>
> +#include <mach/cpu.h>
> +
> +/**
> + * struct at91_adc_desc - description of the ADC on the board
> + * @clock:		ADC clock as specified by the datasheet, in Hz.
> + * @num_channels:	global number of channels available on the board (to
> +			specify which channels are indeed in use on the
> +			board, see the channels_used bitmask in the platform
> +			data)
> + * @startup_time:	startup time of the ADC in microseconds
> + */
> +struct at91_adc_desc {
> +	u32			clock;
> +	u8			num_channels;
> +	u8			startup_time;
> +};
> +
> +struct at91_adc_state {
> +	unsigned long		channels_mask;
> +	struct clk		*clk;
> +	bool			done;
> +	struct at91_adc_desc	*desc;
> +	int			irq;
> +	u16			last_value;
> +	struct mutex		lock;
> +	void __iomem		*reg_base;
> +	u32			vref_mv;
> +	wait_queue_head_t	wq_data_avail;
> +};
> +
> +static struct at91_adc_desc at91_adc_desc_sam9g20 = {
> +	.clock = 5000000,
> +	.num_channels = 4,
> +	.startup_time = 10,
> +};
> +
> +static int at91_adc_select_soc(struct at91_adc_state *st)
> +{
> +	if (cpu_is_at91sam9g20()) {
> +		st->desc = &at91_adc_desc_sam9g20;
> +		return 0;
> +	}
> +
> +	return -ENODEV;
> +}
> +
> +static inline u32 at91_adc_reg_read(struct at91_adc_state *st,
> +				    u8 reg)
> +{
> +	return readl_relaxed(st->reg_base + reg);
> +}
> +
> +static inline void at91_adc_reg_write(struct at91_adc_state *st,
> +				      u8 reg,
> +				      u32 val)
> +{
> +	writel_relaxed(val, st->reg_base + reg);
> +}
> +
> +static irqreturn_t at91_adc_eoc_trigger(int irq, void *private)
> +{
> +	struct iio_dev *idev = private;
> +	struct at91_adc_state *st = iio_priv(idev);
> +	unsigned int status = at91_adc_reg_read(st, AT91_ADC_SR);
> +
> +	if (!(status & AT91_ADC_DRDY))
> +		return IRQ_HANDLED;
> +
> +	if (status & st->channels_mask) {
> +		st->done = true;
> +		st->last_value = at91_adc_reg_read(st, AT91_ADC_LCDR);
> +	}
> +
> +	wake_up_interruptible(&st->wq_data_avail);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int at91_adc_channel_init(struct iio_dev *idev,
> +				 struct at91_adc_data *pdata)
> +{
> +	struct at91_adc_state *st = iio_priv(idev);
> +	struct iio_chan_spec *chan_array;
> +	int bit, idx = 0;
> +
> +	idev->num_channels = bitmap_weight(&pdata->channels_used,
> +					   st->desc->num_channels);
> +	chan_array = kcalloc(idev->num_channels, sizeof(struct iio_chan_spec),
> +			     GFP_KERNEL);
> +
> +	if (chan_array == NULL)
> +		return -ENOMEM;
> +
> +	for_each_set_bit(bit, &pdata->channels_used, st->desc->num_channels) {
> +		struct iio_chan_spec *chan = chan_array + idx;
> +		chan->type = IIO_VOLTAGE;
> +		chan->indexed = 1;
> +		chan->channel = bit;
> +		chan->scan_type.sign = 'u';
> +		chan->scan_type.realbits = 10;
> +		chan->info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT;
> +		idx++;
> +	}
> +
> +	idev->channels = chan_array;
> +	return idev->num_channels;
> +}
> +
> +static void at91_adc_channel_remove(struct iio_dev *idev)
> +{
> +	kfree(idev->channels);
> +}
> +
> +static int at91_adc_read_raw(struct iio_dev *idev,
> +			     struct iio_chan_spec const *chan,
> +			     int *val, int *val2, long mask)
> +{
> +	struct at91_adc_state *st = iio_priv(idev);
> +	int ret;
> +
> +	switch (mask) {
> +	case 0:
> +		mutex_lock(&st->lock);
> +
> +		at91_adc_reg_write(st, AT91_ADC_CHER,
> +				  AT91_ADC_CH(chan->channel));
> +		at91_adc_reg_write(st, AT91_ADC_IER,
> +				  AT91_ADC_EOC(chan->channel));
> +		at91_adc_reg_write(st, AT91_ADC_CR, AT91_ADC_START);
> +
> +		ret = wait_event_interruptible_timeout(st->wq_data_avail,
> +						       st->done,
> +						       msecs_to_jiffies(1000));
> +		if (ret == 0)
> +			return -ETIMEDOUT;
> +		else if (ret < 0)
> +			return ret;
> +
> +		*val = st->last_value;
> +
> +		at91_adc_reg_write(st, AT91_ADC_CHDR,
> +				  AT91_ADC_CH(chan->channel));
> +		at91_adc_reg_write(st, AT91_ADC_IDR,
> +				  AT91_ADC_EOC(chan->channel));
> +
> +		st->last_value = 0;
> +		st->done = false;
> +		mutex_unlock(&st->lock);
> +		return IIO_VAL_INT;
> +
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = (st->vref_mv * 1000) >> chan->scan_type.realbits;
> +		*val2 = 0;
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	default:
> +		break;
> +	}
> +	return -EINVAL;
> +}
> +
> +static const struct iio_info at91_adc_info = {
> +	.driver_module = THIS_MODULE,
> +	.read_raw = &at91_adc_read_raw,
> +};
> +
> +static int __devinit at91_adc_probe(struct platform_device *pdev)
> +{
> +	unsigned int prsc, mstrclk, ticks;
> +	int ret;
> +	struct iio_dev *idev;
> +	struct at91_adc_state *st;
> +	struct resource *res;
> +	struct at91_adc_data *pdata = pdev->dev.platform_data;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "No resource defined\n");
> +		ret = -ENXIO;
> +		goto error_ret;
> +	}
> +
> +	idev = iio_device_allocate(sizeof(struct at91_adc_state));
> +	if (idev == NULL) {
> +		ret = -ENOMEM;
> +		goto error_ret;
> +	}
> +
> +	platform_set_drvdata(pdev, idev);
> +
> +	idev->dev.parent = &pdev->dev;
> +	idev->name = dev_name(&pdev->dev);
> +	idev->info = &at91_adc_info;
> +
> +	st = iio_priv(idev);
> +	ret = at91_adc_select_soc(st);
> +	if (ret) {
> +		dev_err(&pdev->dev, "SoC unknown\n");
> +		goto error_free_device;
> +	}
> +
> +	st->irq = platform_get_irq(pdev, 0);
> +	if (st->irq < 0) {
> +		dev_err(&pdev->dev, "No IRQ ID is designated\n");
> +		ret = -ENODEV;
> +		goto error_free_device;
> +	}
> +
> +	if (!request_mem_region(res->start, resource_size(res),
> +				"AT91 adc registers")) {
> +		dev_err(&pdev->dev, "Resources are unavailable.\n");
> +		ret = -EBUSY;
> +		goto error_free_device;
> +	}
> +
> +	st->reg_base = ioremap(res->start, resource_size(res));
> +	if (!st->reg_base) {
> +		dev_err(&pdev->dev, "Failed to map registers.\n");
> +		ret = -ENOMEM;
> +		goto error_release_mem;
> +	}
> +
> +	/*
> +	 * Disable all IRQs before setting up the handler
> +	 */
> +	at91_adc_reg_write(st, AT91_ADC_CR, AT91_ADC_SWRST);
> +	at91_adc_reg_write(st, AT91_ADC_IDR, 0xFFFFFFFF);
> +	ret = request_irq(st->irq,
> +			  at91_adc_eoc_trigger,
> +			  0,
> +			  pdev->dev.driver->name,
> +			  idev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
> +		goto error_unmap_reg;
> +	}
> +
> +	st->clk = clk_get(&pdev->dev, "adc_clk");
> +	if (IS_ERR(st->clk)) {
> +		dev_err(&pdev->dev, "Failed to get the clock.\n");
> +		ret = PTR_ERR(st->clk);
> +		goto error_free_irq;
> +	}
> +
> +	clk_enable(st->clk);
> +	mstrclk = clk_get_rate(st->clk);
> +
> +	if (!pdata) {
> +		dev_err(&pdev->dev, "No platform data available.\n");
> +		ret = -EINVAL;
> +		goto error_free_clk;
> +	}
> +
> +	if (!st->desc->clock) {
> +		dev_err(&pdev->dev, "No ADCClock available.\n");
> +		ret = -EINVAL;
> +		goto error_free_clk;
> +	}
> +
> +	/*
> +	 * Prescaler rate computation using the formula from the Atmel's
> +	 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being
> +	 * specified by the electrical characteristics of the board.
> +	 */
> +	prsc = (mstrclk / (2 * st->desc->clock)) - 1;
> +
> +	if (!st->desc->startup_time) {
> +		dev_err(&pdev->dev, "No startup time available.\n");
> +		ret = -EINVAL;
> +		goto error_free_clk;
> +	}
> +
> +	/*
> +	 * Number of ticks needed to cover the startup time of the ADC as
> +	 * defined in the electrical characteristics of the board, divided by 8.
> +	 * The formula thus is : Startup Time = (ticks + 1) * 8 / ADC Clock
> +	 */
> +	ticks = round_up((st->desc->startup_time * st->desc->clock /
> +			  1000000) - 1, 8) / 8;
> +	at91_adc_reg_write(st, AT91_ADC_MR,
> +			  (AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |
> +			  (AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));
> +
> +	/* Setup the ADC channels available on the board */
> +	ret = at91_adc_channel_init(idev, pdata);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Couldn't initialize the channels.\n");
> +		goto error_free_clk;
> +	}
> +
> +	init_waitqueue_head(&st->wq_data_avail);
> +	mutex_init(&st->lock);
> +
> +	st->vref_mv = pdata->vref;
> +	st->channels_mask = pdata->channels_used;
> +
> +	ret = iio_device_register(idev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Couldn't register the device.\n");
> +		goto error_free_channels;
> +	}
> +
> +	return 0;
> +
> +error_free_channels:
> +	at91_adc_channel_remove(idev);
> +error_free_clk:
> +	clk_disable(st->clk);
> +	clk_put(st->clk);
> +error_free_irq:
> +	free_irq(st->irq, idev);
> +error_unmap_reg:
> +	iounmap(st->reg_base);
> +error_release_mem:
> +	release_mem_region(res->start, resource_size(res));
> +error_free_device:
> +	iio_device_free(idev);
> +error_ret:
> +	return ret;
> +}
> +
> +static int __devexit at91_adc_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *idev = platform_get_drvdata(pdev);
> +	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	struct at91_adc_state *st = iio_priv(idev);
> +
> +	iio_device_unregister(idev);
> +	at91_adc_channel_remove(idev);
> +	clk_disable(st->clk);
> +	clk_put(st->clk);
> +	free_irq(st->irq, idev);
> +	iounmap(st->reg_base);
> +	release_mem_region(res->start, resource_size(res));
> +	iio_device_free(idev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver at91_adc_driver = {
> +	.probe = at91_adc_probe,
> +	.remove = __devexit_p(at91_adc_remove),
> +	.driver = {
> +		   .name = "at91_adc",
> +	},
> +};
> +
> +module_platform_driver(at91_adc_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("Atmel AT91 ADC Driver");
> +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");


-- 
Nicolas Ferre

[PATCH 3/3] ARM: AT91: Add the ADC to the sam9g20ek board

[Nicolas Ferre]

On 01/16/2012 10:36 PM, Maxime Ripard :
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> 
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |   53 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9g20ek.c     |   13 +++++++
>  2 files changed, 66 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 39f81f4..3598540 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -16,6 +16,8 @@
>  #include <linux/platform_device.h>
>  #include <linux/i2c-gpio.h>
>  
> +#include <linux/platform_data/at91_adc.h>
> +
>  #include <mach/board.h>
>  #include <mach/gpio.h>
>  #include <mach/cpu.h>
> @@ -1312,6 +1314,57 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  void __init at91_add_device_cf(struct at91_cf_data * data) {}
>  #endif
>  
> +/* --------------------------------------------------------------------
> + *  ADCs
> + * -------------------------------------------------------------------- */
> +
> +#if defined(CONFIG_IIO_AT91_ADC) || defined(CONFIG_IIO_AT91_ADC_MODULE)
> +static struct at91_adc_data adc_data;
> +
> +static struct resource adc_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9260_BASE_ADC,
> +		.end	= AT91SAM9260_BASE_ADC + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9260_ID_ADC,
> +		.end	= AT91SAM9260_ID_ADC,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91_adc_device = {
> +	.name		= "at91_adc",
> +	.id		= -1,
> +	.dev		= {
> +				.platform_data		= &adc_data,
> +	},
> +	.resource	= adc_resources,
> +	.num_resources	= ARRAY_SIZE(adc_resources),
> +};
> +
> +void __init at91_add_device_adc(struct at91_adc_data *data)
> +{
> +	if (!data)
> +		return;
> +
> +	if (test_bit(0, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC0, 0);
> +	if (test_bit(1, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC1, 0);
> +	if (test_bit(2, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC2, 0);
> +	if (test_bit(3, &data->channels_used))
> +		at91_set_A_periph(AT91_PIN_PC3, 0);
> +
> +	adc_data = *data;
> +	platform_device_register(&at91_adc_device);
> +}
> +#else
> +void __init at91_add_device_adc(struct at91_adc_data *data) {}
> +#endif
> +
>  /* -------------------------------------------------------------------- */
>  /*
>   * These devices are always present and don't need any board-specific
> diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
> index 817f59d..29dae9f 100644
> --- a/arch/arm/mach-at91/board-sam9g20ek.c
> +++ b/arch/arm/mach-at91/board-sam9g20ek.c
> @@ -31,6 +31,8 @@
>  #include <linux/regulator/fixed.h>
>  #include <linux/regulator/consumer.h>
>  
> +#include <linux/platform_data/at91_adc.h>
> +
>  #include <mach/hardware.h>
>  #include <asm/setup.h>
>  #include <asm/mach-types.h>
> @@ -314,6 +316,15 @@ static void __init ek_add_device_buttons(void)
>  static void __init ek_add_device_buttons(void) {}
>  #endif
>  
> +/*
> + * ADCs
> + */
> +
> +static struct at91_adc_data ek_adc_data = {
> +	.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
> +	.vref = 3300,
> +};
> +
>  #if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
>  static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
>  	REGULATOR_SUPPLY("AVDD", "0-001b"),
> @@ -389,6 +400,8 @@ static void __init ek_board_init(void)
>  	ek_add_device_gpio_leds();
>  	/* Push Buttons */
>  	ek_add_device_buttons();
> +	/* ADCs */
> +	at91_add_device_adc(&ek_adc_data);
>  	/* PCK0 provides MCLK to the WM8731 */
>  	at91_set_B_periph(AT91_PIN_PC1, 0);
>  	/* SSC (for WM8731) */


-- 
Nicolas Ferre