[PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes

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* [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes
       [not found] <[PATCH v3 0/3] OMAP3: beaglexm: GPIO fixes>
@ 2011-01-07 23:01 ` Nishanth Menon
  2011-01-07 23:17   ` Kevin Hilman
  2011-01-10 19:04   ` Tony Lindgren
  2011-01-07 23:01 ` [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir Nishanth Menon
                   ` (2 subsequent siblings)
  3 siblings, 2 replies; 11+ messages in thread
From: Nishanth Menon @ 2011-01-07 23:01 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,
As discussed in the threads:
http://thread.gmane.org/gmane.linux.ports.arm.omap/47807/
http://marc.info/?t=121540030800004&r=1&w=2

here is the split up series with commit message after discussion:
http://www.beagleboard.org/irclogs/index.php?date=2011-01-06#T19:12:21

Koen Kooi (3):
  omap3: beaglexm: fix EHCI power up GPIO dir
  omap3: beaglexm: fix DVI reset GPIO
  omap3: beaglexm: fix power on of DVI

 arch/arm/mach-omap2/board-omap3beagle.c |   37 ++++++++++++++++++++++++++----
 1 files changed, 32 insertions(+), 5 deletions(-)

v4:
  no functional change.
  minor cleanups in commit logs incorporating offline feedback

v3: http://marc.info/?t=129434384700006&r=1&w=2
	split up the series, addressed review comments

v2: http://marc.info/?t=129276977900002&r=1&w=2
	Reenable the PMU stat LED
v1: http://marc.info/?t=129172571000001&r=1&w=2

Regards,
Nishanth Menon

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes
  2011-01-07 23:01 ` [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes Nishanth Menon
@ 2011-01-07 23:17   ` Kevin Hilman
  2011-01-10 19:04   ` Tony Lindgren
  1 sibling, 0 replies; 11+ messages in thread
From: Kevin Hilman @ 2011-01-07 23:17 UTC (permalink / raw)
  To: linux-arm-kernel

Nishanth Menon <nm@ti.com> writes:

> As discussed in the threads:
> http://thread.gmane.org/gmane.linux.ports.arm.omap/47807/
> http://marc.info/?t=121540030800004&r=1&w=2
>
> here is the split up series with commit message after discussion:
> http://www.beagleboard.org/irclogs/index.php?date=2011-01-06#T19:12:21
>
> Koen Kooi (3):
>   omap3: beaglexm: fix EHCI power up GPIO dir
>   omap3: beaglexm: fix DVI reset GPIO
>   omap3: beaglexm: fix power on of DVI
>
>  arch/arm/mach-omap2/board-omap3beagle.c |   37 ++++++++++++++++++++++++++----
>  1 files changed, 32 insertions(+), 5 deletions(-)
>
> v4:
>   no functional change.
>   minor cleanups in commit logs incorporating offline feedback

Thanks for the updates.  Will queue in  my fixes queue.

Kevin

> v3: http://marc.info/?t=129434384700006&r=1&w=2
> 	split up the series, addressed review comments
>
> v2: http://marc.info/?t=129276977900002&r=1&w=2
> 	Reenable the PMU stat LED
> v1: http://marc.info/?t=129172571000001&r=1&w=2
>
> Regards,
> Nishanth Menon

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes
  2011-01-07 23:01 ` [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes Nishanth Menon
  2011-01-07 23:17   ` Kevin Hilman
@ 2011-01-10 19:04   ` Tony Lindgren
  2011-01-10 19:13     ` Nishanth Menon
  1 sibling, 1 reply; 11+ messages in thread
From: Tony Lindgren @ 2011-01-10 19:04 UTC (permalink / raw)
  To: linux-arm-kernel

* Nishanth Menon <nm@ti.com> [110107 15:00]:
> Hi,
> As discussed in the threads:
> http://thread.gmane.org/gmane.linux.ports.arm.omap/47807/
> http://marc.info/?t=121540030800004&r=1&w=2
> 
> here is the split up series with commit message after discussion:
> http://www.beagleboard.org/irclogs/index.php?date=2011-01-06#T19:12:21
> 
> Koen Kooi (3):
>   omap3: beaglexm: fix EHCI power up GPIO dir
>   omap3: beaglexm: fix DVI reset GPIO
>   omap3: beaglexm: fix power on of DVI

Dropping the earlier versions from omap-fixes, I want to get the
build fixes in ASAP. These can wait a bit until Aaro's comments
are addressed.

Regards,

Tony

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes
  2011-01-10 19:04   ` Tony Lindgren
@ 2011-01-10 19:13     ` Nishanth Menon
  0 siblings, 0 replies; 11+ messages in thread
From: Nishanth Menon @ 2011-01-10 19:13 UTC (permalink / raw)
  To: linux-arm-kernel

Tony Lindgren had written, on 01/10/2011 01:04 PM, the following:
> * Nishanth Menon <nm@ti.com> [110107 15:00]:
>> Hi,
>> As discussed in the threads:
>> http://thread.gmane.org/gmane.linux.ports.arm.omap/47807/
>> http://marc.info/?t=121540030800004&r=1&w=2
>>
>> here is the split up series with commit message after discussion:
>> http://www.beagleboard.org/irclogs/index.php?date=2011-01-06#T19:12:21
>>
>> Koen Kooi (3):
>>   omap3: beaglexm: fix EHCI power up GPIO dir
>>   omap3: beaglexm: fix DVI reset GPIO
>>   omap3: beaglexm: fix power on of DVI
> 
> Dropping the earlier versions from omap-fixes, I want to get the
> build fixes in ASAP. These can wait a bit until Aaro's comments
> are addressed.
Ack. will post a v5 after aligning. build breakages have higher priority 
ofcourse ;)

-- 
Regards,
Nishanth Menon

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir
       [not found] <[PATCH v3 0/3] OMAP3: beaglexm: GPIO fixes>
  2011-01-07 23:01 ` [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes Nishanth Menon
@ 2011-01-07 23:01 ` Nishanth Menon
  2011-01-10 12:44   ` Aaro Koskinen
  2011-01-07 23:01 ` [PATCH v4 2/3] omap3: beaglexm: fix DVI reset GPIO Nishanth Menon
  2011-01-07 23:01 ` [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI Nishanth Menon
  3 siblings, 1 reply; 11+ messages in thread
From: Nishanth Menon @ 2011-01-07 23:01 UTC (permalink / raw)
  To: linux-arm-kernel

From: Koen Kooi <koen@beagleboard.org>

EHCI enable power pin is inverted (active high) in comparison
to vanilla beagle which is active low. Handle this case conditionally.

Without this fix, Beagle XM 4 port EHCI will not function and no
networking will be available

[nm at ti.com: split up, added descriptive changelogs]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Koen Kooi <koen@beagleboard.org>
---
 arch/arm/mach-omap2/board-omap3beagle.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 6c12760..1b5aa7a 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -297,9 +297,16 @@ static int beagle_twl_gpio_setup(struct device *dev,
 	gpio_request(gpio + 1, "EHCI_nOC");
 	gpio_direction_input(gpio + 1);
 
-	/* TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, active low) */
+	/*
+	 * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
+	 * high / others active low)
+	 */
 	gpio_request(gpio + TWL4030_GPIO_MAX, "nEN_USB_PWR");
 	gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
+	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM)
+		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 1);
+	else
+		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
 
 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
-- 
1.6.3.3

^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir
  2011-01-07 23:01 ` [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir Nishanth Menon
@ 2011-01-10 12:44   ` Aaro Koskinen
  2011-01-10 14:23     ` Nishanth Menon
  0 siblings, 1 reply; 11+ messages in thread
From: Aaro Koskinen @ 2011-01-10 12:44 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,

On Fri, 7 Jan 2011, Nishanth Menon wrote:
> From: Koen Kooi <koen@beagleboard.org>
>
> EHCI enable power pin is inverted (active high) in comparison
> to vanilla beagle which is active low. Handle this case conditionally.
>
> Without this fix, Beagle XM 4 port EHCI will not function and no
> networking will be available
>
> [nm at ti.com: split up, added descriptive changelogs]
> Signed-off-by: Nishanth Menon <nm@ti.com>
> Signed-off-by: Koen Kooi <koen@beagleboard.org>
> ---
> arch/arm/mach-omap2/board-omap3beagle.c |    9 ++++++++-
> 1 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
> index 6c12760..1b5aa7a 100644
> --- a/arch/arm/mach-omap2/board-omap3beagle.c
> +++ b/arch/arm/mach-omap2/board-omap3beagle.c
> @@ -297,9 +297,16 @@ static int beagle_twl_gpio_setup(struct device *dev,
> 	gpio_request(gpio + 1, "EHCI_nOC");
> 	gpio_direction_input(gpio + 1);
>
> -	/* TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, active low) */
> +	/*
> +	 * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
> +	 * high / others active low)
> +	 */
> 	gpio_request(gpio + TWL4030_GPIO_MAX, "nEN_USB_PWR");
> 	gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);

This call should be deleted.

> +	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM)
> +		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 1);
> +	else
> +		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
>
> 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
> 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
> -- 
> 1.6.3.3
>

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir
  2011-01-10 12:44   ` Aaro Koskinen
@ 2011-01-10 14:23     ` Nishanth Menon
  0 siblings, 0 replies; 11+ messages in thread
From: Nishanth Menon @ 2011-01-10 14:23 UTC (permalink / raw)
  To: linux-arm-kernel

Aaro Koskinen had written, on 01/10/2011 06:44 AM, the following:
> Hi,
> 
> On Fri, 7 Jan 2011, Nishanth Menon wrote:
>> From: Koen Kooi <koen@beagleboard.org>
>>
>> EHCI enable power pin is inverted (active high) in comparison
>> to vanilla beagle which is active low. Handle this case conditionally.
>>
>> Without this fix, Beagle XM 4 port EHCI will not function and no
>> networking will be available
>>
>> [nm at ti.com: split up, added descriptive changelogs]
>> Signed-off-by: Nishanth Menon <nm@ti.com>
>> Signed-off-by: Koen Kooi <koen@beagleboard.org>
>> ---
>> arch/arm/mach-omap2/board-omap3beagle.c |    9 ++++++++-
>> 1 files changed, 8 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/board-omap3beagle.c 
>> b/arch/arm/mach-omap2/board-omap3beagle.c
>> index 6c12760..1b5aa7a 100644
>> --- a/arch/arm/mach-omap2/board-omap3beagle.c
>> +++ b/arch/arm/mach-omap2/board-omap3beagle.c
>> @@ -297,9 +297,16 @@ static int beagle_twl_gpio_setup(struct device *dev,
>>     gpio_request(gpio + 1, "EHCI_nOC");
>>     gpio_direction_input(gpio + 1);
>>
>> -    /* TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, active 
>> low) */
>> +    /*
>> +     * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
>> +     * high / others active low)
>> +     */
>>     gpio_request(gpio + TWL4030_GPIO_MAX, "nEN_USB_PWR");
>>     gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
> 
> This call should be deleted.

yikes. yep. thanks for catching.


-- 
Regards,
Nishanth Menon

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 2/3] omap3: beaglexm: fix DVI reset GPIO
       [not found] <[PATCH v3 0/3] OMAP3: beaglexm: GPIO fixes>
  2011-01-07 23:01 ` [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes Nishanth Menon
  2011-01-07 23:01 ` [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir Nishanth Menon
@ 2011-01-07 23:01 ` Nishanth Menon
  2011-01-07 23:01 ` [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI Nishanth Menon
  3 siblings, 0 replies; 11+ messages in thread
From: Nishanth Menon @ 2011-01-07 23:01 UTC (permalink / raw)
  To: linux-arm-kernel

From: Koen Kooi <koen@beagleboard.org>

GPIO reset line for Beagle XM is different from vanilla beagle
so we populate it as part of gpio update routine.

This in part fixes the issue of display not functioning on beagle XM
platform.

[nm at ti.com: split up, added descriptive changelogs]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Koen Kooi <koen@beagleboard.org>
---
 arch/arm/mach-omap2/board-omap3beagle.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 1b5aa7a..d628f5e 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -199,7 +199,7 @@ static struct omap_dss_device beagle_dvi_device = {
 	.name = "dvi",
 	.driver_name = "generic_panel",
 	.phy.dpi.data_lines = 24,
-	.reset_gpio = 170,
+	.reset_gpio = -EINVAL,
 	.platform_enable = beagle_enable_dvi,
 	.platform_disable = beagle_disable_dvi,
 };
@@ -308,6 +308,12 @@ static int beagle_twl_gpio_setup(struct device *dev,
 	else
 		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
 
+	/* DVI reset GPIO is different between beagle revisions */
+	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM)
+		beagle_dvi_device.reset_gpio = 129;
+	else
+		beagle_dvi_device.reset_gpio = 170;
+
 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
 
-- 
1.6.3.3

^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI
       [not found] <[PATCH v3 0/3] OMAP3: beaglexm: GPIO fixes>
                   ` (2 preceding siblings ...)
  2011-01-07 23:01 ` [PATCH v4 2/3] omap3: beaglexm: fix DVI reset GPIO Nishanth Menon
@ 2011-01-07 23:01 ` Nishanth Menon
  2011-01-10 12:51   ` Aaro Koskinen
  3 siblings, 1 reply; 11+ messages in thread
From: Nishanth Menon @ 2011-01-07 23:01 UTC (permalink / raw)
  To: linux-arm-kernel

From: Koen Kooi <koen@beagleboard.org>

TFP410 DVI chip is used to provide display out.
This chip is controlled by 2 lines:
LDO which supplies the power is controlled over gpio + 2
and the enable of the chip itself is done over gpio + 1
NOTE: the LDO is necessary for LED, serial blocks as well.

gpio + 1 was used to sense USB overcurrent in vanilla beagle.

Without this fix, the display would not function as the LDO
remains shut down.

[nm at ti.com: split up, added descriptive changelogs]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Koen Kooi <koen@beagleboard.org>
---
 arch/arm/mach-omap2/board-omap3beagle.c |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index d628f5e..7c82730 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -293,9 +293,10 @@ static int beagle_twl_gpio_setup(struct device *dev,
 	/* REVISIT: need ehci-omap hooks for external VBUS
 	 * power switch and overcurrent detect
 	 */
-
-	gpio_request(gpio + 1, "EHCI_nOC");
-	gpio_direction_input(gpio + 1);
+	if (omap3_beagle_get_rev() != OMAP3BEAGLE_BOARD_XM) {
+		gpio_request(gpio + 1, "EHCI_nOC");
+		gpio_direction_input(gpio + 1);
+	}
 
 	/*
 	 * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
@@ -317,6 +318,19 @@ static int beagle_twl_gpio_setup(struct device *dev,
 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
 
+	/*
+	 * gpio + 1 on Xm controls the TFP410's enable line (active low)
+	 * gpio + 2 control varies depending on the board rev as follows:
+	 * P7/P8 revisions(prototype): Camera EN
+	 * A2+ revisions (production): LDO (supplies DVI, serial, led blocks)
+	 */
+	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
+		gpio_request(gpio + 1, "nDVI_PWR_EN");
+		gpio_direction_output(gpio + 1, 0);
+		gpio_request(gpio + 2, "DVI_LDO_EN");
+		gpio_direction_output(gpio + 2, 1);
+	}
+
 	return 0;
 }
 
-- 
1.6.3.3

^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI
  2011-01-07 23:01 ` [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI Nishanth Menon
@ 2011-01-10 12:51   ` Aaro Koskinen
  2011-01-10 14:34     ` Nishanth Menon
  0 siblings, 1 reply; 11+ messages in thread
From: Aaro Koskinen @ 2011-01-10 12:51 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,

On Fri, 7 Jan 2011, Nishanth Menon wrote:
> From: Koen Kooi <koen@beagleboard.org>
>
> TFP410 DVI chip is used to provide display out.
> This chip is controlled by 2 lines:
> LDO which supplies the power is controlled over gpio + 2
> and the enable of the chip itself is done over gpio + 1
> NOTE: the LDO is necessary for LED, serial blocks as well.
>
> gpio + 1 was used to sense USB overcurrent in vanilla beagle.
>
> Without this fix, the display would not function as the LDO
> remains shut down.
>
> [nm at ti.com: split up, added descriptive changelogs]
> Signed-off-by: Nishanth Menon <nm@ti.com>
> Signed-off-by: Koen Kooi <koen@beagleboard.org>
> ---
> arch/arm/mach-omap2/board-omap3beagle.c |   20 +++++++++++++++++---
> 1 files changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
> index d628f5e..7c82730 100644
> --- a/arch/arm/mach-omap2/board-omap3beagle.c
> +++ b/arch/arm/mach-omap2/board-omap3beagle.c
> @@ -293,9 +293,10 @@ static int beagle_twl_gpio_setup(struct device *dev,
> 	/* REVISIT: need ehci-omap hooks for external VBUS
> 	 * power switch and overcurrent detect
> 	 */
> -
> -	gpio_request(gpio + 1, "EHCI_nOC");
> -	gpio_direction_input(gpio + 1);
> +	if (omap3_beagle_get_rev() != OMAP3BEAGLE_BOARD_XM) {
> +		gpio_request(gpio + 1, "EHCI_nOC");
> +		gpio_direction_input(gpio + 1);
> +	}
>
> 	/*
> 	 * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
> @@ -317,6 +318,19 @@ static int beagle_twl_gpio_setup(struct device *dev,
> 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
> 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
>
> +	/*
> +	 * gpio + 1 on Xm controls the TFP410's enable line (active low)
> +	 * gpio + 2 control varies depending on the board rev as follows:
> +	 * P7/P8 revisions(prototype): Camera EN
> +	 * A2+ revisions (production): LDO (supplies DVI, serial, led blocks)
> +	 */
> +	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
> +		gpio_request(gpio + 1, "nDVI_PWR_EN");
> +		gpio_direction_output(gpio + 1, 0);
> +		gpio_request(gpio + 2, "DVI_LDO_EN");
> +		gpio_direction_output(gpio + 2, 1);

FYI, gpiolib provides gpio_request_one() and gpio_request_array() calls
which make code simpler. I think any new code should use those _and_
do proper error checking.

> +	}
> +
> 	return 0;
> }
>
> -- 
> 1.6.3.3
>

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI
  2011-01-10 12:51   ` Aaro Koskinen
@ 2011-01-10 14:34     ` Nishanth Menon
  0 siblings, 0 replies; 11+ messages in thread
From: Nishanth Menon @ 2011-01-10 14:34 UTC (permalink / raw)
  To: linux-arm-kernel

Aaro Koskinen had written, on 01/10/2011 06:51 AM, the following:
[..]
>> +    if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
>> +        gpio_request(gpio + 1, "nDVI_PWR_EN");
>> +        gpio_direction_output(gpio + 1, 0);
>> +        gpio_request(gpio + 2, "DVI_LDO_EN");
>> +        gpio_direction_output(gpio + 2, 1);
> 
> FYI, gpiolib provides gpio_request_one() and gpio_request_array() calls
> which make code simpler. I think any new code should use those _and_
> do proper error checking.
Thanks for pointing this out. Funny why it is in 
include/asm-generic/gpio.h instead of in include/linux/gpio.h 
considering it implemented in drivers/gpio/gpiolib.c :(

Am I right in understanding that you are mentioning about DVI gpios 
alone? in that case, the LDO gpio is used for other functions as well in 
addition to driving DVI. I suppose we dont want to loose that function 
because dvi pwr_en gpio failed.

-- 
Regards,
Nishanth Menon

^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2011-01-10 19:13 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <[PATCH v3 0/3] OMAP3: beaglexm: GPIO fixes>
2011-01-07 23:01 ` [PATCH v4 0/3] OMAP3: beaglexm: GPIO fixes Nishanth Menon
2011-01-07 23:17   ` Kevin Hilman
2011-01-10 19:04   ` Tony Lindgren
2011-01-10 19:13     ` Nishanth Menon
2011-01-07 23:01 ` [PATCH v4 1/3] omap3: beaglexm: fix EHCI power up GPIO dir Nishanth Menon
2011-01-10 12:44   ` Aaro Koskinen
2011-01-10 14:23     ` Nishanth Menon
2011-01-07 23:01 ` [PATCH v4 2/3] omap3: beaglexm: fix DVI reset GPIO Nishanth Menon
2011-01-07 23:01 ` [PATCH v4 3/3] omap3: beaglexm: fix power on of DVI Nishanth Menon
2011-01-10 12:51   ` Aaro Koskinen
2011-01-10 14:34     ` Nishanth Menon

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