Re: [PATCH 3/4] pinctrl: msm: Add ps_hold function in pinctrl-apq8064 binding documentation

Re: [PATCH 3/4] pinctrl: msm: Add ps_hold function in pinctrl-apq8064 binding documentation

[Bjorn Andersson]

On Thu 28 Aug 20:22 PDT 2014, Pramod Gurav wrote:

> This adds a function ps_hold (Power Suppy Hold Signal) in pinctrl-ap8064
> documentation which was missing. This function is used to reset the targets
> with apq8064 soc.
> 
> CC: Linus Walleij <linus.walleij@linaro.org>
> CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>

Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>

Regards,
Bjorn

Re: [PATCH 4/4] pinctrl: qcom: Add support for reset for apq8064

[Bjorn Andersson]

On Thu 28 Aug 20:22 PDT 2014, Pramod Gurav wrote:

> This patch adds support for reset functions to reboot the boards
> with soc apq8064.
> 
> CC: Linus Walleij <linus.walleij@linaro.org>
> CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>
> CC: "Ivan T. Ivanov" <iivanov@mm-sol.com>
> CC: Stephen Boyd <sboyd@codeaurora.org>
> CC: Andy Gross <agross@codeaurora.org>
> Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
> ---
>  drivers/pinctrl/qcom/pinctrl-apq8064.c |    7 +++++-
>  drivers/pinctrl/qcom/pinctrl-msm.c     |   38 ++++++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-apq8064.c b/drivers/pinctrl/qcom/pinctrl-apq8064.c
> index feb6f15..ef1263c 100644
> --- a/drivers/pinctrl/qcom/pinctrl-apq8064.c
> +++ b/drivers/pinctrl/qcom/pinctrl-apq8064.c
> @@ -324,6 +324,7 @@ enum apq8064_functions {
>  	APQ_MUX_tsif1,
>  	APQ_MUX_tsif2,
>  	APQ_MUX_usb2_hsic,
> +	APQ_MUX_ps_hold,
>  	APQ_MUX_NA,
>  };
>  
> @@ -351,6 +352,9 @@ static const char * const gpio_groups[] = {
>  	"gpio78", "gpio79", "gpio80", "gpio81", "gpio82", "gpio83", "gpio84",
>  	"gpio85", "gpio86", "gpio87", "gpio88", "gpio89"
>  };
> +static const char * const ps_hold_groups[] = {
> +	"gpio78"
> +};
>  static const char * const gsbi1_groups[] = {
>  	"gpio18", "gpio19", "gpio20", "gpio21"
>  };
> @@ -477,6 +481,7 @@ static const struct msm_function apq8064_functions[] = {
>  	FUNCTION(tsif1),
>  	FUNCTION(tsif2),
>  	FUNCTION(usb2_hsic),
> +	FUNCTION(ps_hold),
>  };
>  
>  static const struct msm_pingroup apq8064_groups[] = {
> @@ -558,7 +563,7 @@ static const struct msm_pingroup apq8064_groups[] = {
>  	PINGROUP(75, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>  	PINGROUP(76, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>  	PINGROUP(77, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
> -	PINGROUP(78, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
> +	PINGROUP(78, ps_hold, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>  	PINGROUP(79, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>  	PINGROUP(80, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>  	PINGROUP(81, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 2738108..be43e7a 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -12,6 +12,7 @@
>   * GNU General Public License for more details.
>   */
>  
> +#include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
> @@ -27,12 +28,17 @@
>  #include <linux/interrupt.h>
>  #include <linux/spinlock.h>
>  
> +#include <asm/system_misc.h>
> +
>  #include "../core.h"
>  #include "../pinconf.h"
>  #include "pinctrl-msm.h"
>  #include "../pinctrl-utils.h"
>  
>  #define MAX_NR_GPIO 300
> +#define PS_HOLD_OFFSET 0x820
> +
> +static void __iomem *msm_ps_hold;
>  
>  /**
>   * struct msm_pinctrl - state for a pinctrl-msm device
> @@ -848,10 +854,31 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
>  	return 0;
>  }
>  
> +static void qcom_reset(enum reboot_mode reboot_mode, const char *cmd)

This doesn't follow the naming used in this.

> +{
> +	writel(0, msm_ps_hold);
> +	mdelay(10000);

Why 10 seconds? What happens after that?

> +}
> +
> +const struct msm_function
> +*find_pshold_function(const struct msm_function *functions,
> +					unsigned nfunctions, const char *name)

This should be static. But that would cause a compile warning on non-ARM
platforms, see below.

> +{
> +	int i = 0;
> +	const struct msm_function *func;
> +
> +	for (func = functions; i <= nfunctions; func++, i++)

Why do you have 'func' and why do you iterate over that and i?

for (i = 0; i < nfunctions; i++)
	if (strcmp(functions[i]->name, name) == 0)
		return true; (or &functions[i] if you really need it)

But as you only uses this once I would prefer if you just merge in the setting
of msm_ps_hold and arm_pm_restart here as well, see below.

> +		if (!strcmp(func->name, name))
> +			return func;
> +
> +	return NULL;
> +}
> +
>  int msm_pinctrl_probe(struct platform_device *pdev,
>  		      const struct msm_pinctrl_soc_data *soc_data)
>  {
>  	struct msm_pinctrl *pctrl;
> +	const struct msm_function *func;
>  	struct resource *res;
>  	int ret;
>  
> @@ -871,6 +898,17 @@ int msm_pinctrl_probe(struct platform_device *pdev,
>  	if (IS_ERR(pctrl->regs))
>  		return PTR_ERR(pctrl->regs);
>  
> +#ifdef CONFIG_ARM
> +	func = find_pshold_function(soc_data->functions,
> +					soc_data->nfunctions, "ps_hold");
> +	if (func) {
> +		dev_dbg(&pdev->dev, "Found Function %s\n", func->name);

Guess what, it will print "ps_hold" here. I would prefer if you just skip this
line, as this will always be true on 8960 and 8064.

> +		msm_ps_hold = pctrl->regs + PS_HOLD_OFFSET;
> +		arm_pm_restart = qcom_reset;
> +	}
> +#else
> +#error "not supported on this arch"

There is no reason for you to break compilation of this driver on non-ARM
platforms. This #else/#error should be removed.

I would prefer if you did not #ifdef at all within the function, but rather
merge this piece of logic with the search above into a static function that's
surrounded by a check for CONFIG_ARM - providing a no-op for non-arm boards.

I.e

#ifdef CONFIG_ARM
static void qcom_reset(enum reboot_mode reboot_mode, const char *cmd)
{
	...
}

static void msm_pinctrl_setup_pm_reset(pctrl)
{
	...
}
#else
static void msm_pinctrl_setup_pm_reset(pctrl) {}
#endif

> +#endif

Regards,
Bjorn

[PATCH 0/4] Add reset support for apq8064

[Pramod Gurav]

The reset on apq8064 is provided on gpio78 function1. We need to configure
gpio78 to function as ps_hold and write to base of the register to get the
device rebooted. 

First two patches in this patchset adds necessary DT support for apq8064-pinctrl
and DT support to mux gpio_78 as ps_hold function.

Third patch documents the ps_hold function in apq8064-pinctrl DT binding

Fourth implements the actual reset by initialising arm_pm_restart to a reset
function if ps_hold function is programmed in the pinctrl driver.

This is v2 with below changes since v1:
1. Added #error log as suggested by Kumar Gala 
2. Correct interrupts in DT from 32 to 16 based on Bjorn's new patch in bindings
3. Replaced hardcoding in DT with IRQ_TYPE_LEVEL_HIGH for interrupt level type

Pramod Gurav (4):
  ARM: DT: APQ8064: Add pinctrl support
  ARM: DT: APQ8064: Add node for ps_hold function in pinctrl
  pinctrl: msm: Add ps_hold function in pinctrl-apq8064 binding
    documentation
  pinctrl: qcom: Add support for reset for apq8064

 .../bindings/pinctrl/qcom,apq8064-pinctrl.txt      |    2 +-
 arch/arm/boot/dts/qcom-apq8064.dtsi                |   21 +++++++++++
 drivers/pinctrl/qcom/pinctrl-apq8064.c             |    7 +++-
 drivers/pinctrl/qcom/pinctrl-msm.c                 |   38 ++++++++++++++++++++
 4 files changed, 66 insertions(+), 2 deletions(-)

[PATCH 1/4] ARM: DT: APQ8064: Add pinctrl support

[Pramod Gurav]

This patch adds device tree nodes to support pinctrl for apq8064 SOC

CC: Rob Herring <robh+dt@kernel.org>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: devicetree@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 arch/arm/boot/dts/qcom-apq8064.dtsi |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/qcom-apq8064.dtsi b/arch/arm/boot/dts/qcom-apq8064.dtsi
index d66fb25..e23303e 100644
--- a/arch/arm/boot/dts/qcom-apq8064.dtsi
+++ b/arch/arm/boot/dts/qcom-apq8064.dtsi
@@ -73,6 +73,17 @@
 		ranges;
 		compatible = "simple-bus";
 
+		msm_gpio: pinctrl@800000 {
+			compatible = "qcom,apq8064-pinctrl";
+			reg = <0x800000 0x4000>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
+			interrupts = <0 16 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
 		intc: interrupt-controller@2000000 {
 			compatible = "qcom,msm-qgic2";
 			interrupt-controller;
-- 
1.7.0.4

[PATCH 2/4] ARM: DT: APQ8064: Add node for ps_hold function in pinctrl

[Pramod Gurav]

This patch adds DT support to configure GPIO_78 as function ps_hold
on apq8064.

CC: Rob Herring <robh+dt@kernel.org>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: devicetree@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 arch/arm/boot/dts/qcom-apq8064.dtsi |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/qcom-apq8064.dtsi b/arch/arm/boot/dts/qcom-apq8064.dtsi
index e23303e..35c1907 100644
--- a/arch/arm/boot/dts/qcom-apq8064.dtsi
+++ b/arch/arm/boot/dts/qcom-apq8064.dtsi
@@ -82,6 +82,16 @@
 			interrupt-controller;
 			#interrupt-cells = <2>;
 			interrupts = <0 16 IRQ_TYPE_LEVEL_HIGH>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&ps_hold>;
+
+			ps_hold: ps_hold {
+				mux {
+					pins = "gpio78";
+					function = "ps_hold";
+				};
+			};
 		};
 
 		intc: interrupt-controller@2000000 {
-- 
1.7.0.4

[PATCH 3/4] pinctrl: msm: Add ps_hold function in pinctrl-apq8064 binding documentation

[Pramod Gurav]

This adds a function ps_hold (Power Suppy Hold Signal) in pinctrl-ap8064
documentation which was missing. This function is used to reset the targets
with apq8064 soc.

CC: Linus Walleij <linus.walleij@linaro.org>
CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>
CC: "Ivan T. Ivanov" <iivanov@mm-sol.com>
CC: Stephen Boyd <sboyd@codeaurora.org>
CC: Andy Gross <agross@codeaurora.org>

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 .../bindings/pinctrl/qcom,apq8064-pinctrl.txt      |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
index 0211c6d..ca5bfa5 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
@@ -50,7 +50,7 @@ Valid values for function are:
   gsbi4_cam_i2c, gsbi5, gsbi5_spi_cs1, gsbi5_spi_cs2, gsbi5_spi_cs3, gsbi6,
   gsbi6_spi_cs1, gsbi6_spi_cs2, gsbi6_spi_cs3, gsbi7, gsbi7_spi_cs1,
   gsbi7_spi_cs2, gsbi7_spi_cs3, gsbi_cam_i2c, hdmi, mi2s, riva_bt, riva_fm,
-  riva_wlan, sdc2, sdc4, slimbus, spkr_i2s, tsif1, tsif2, usb2_hsic,
+  riva_wlan, sdc2, sdc4, slimbus, spkr_i2s, tsif1, tsif2, usb2_hsic, ps_hold
 
 Example:
 
-- 
1.7.0.4

[PATCH 4/4] pinctrl: qcom: Add support for reset for apq8064

[Pramod Gurav]

This patch adds support for reset functions to reboot the boards
with soc apq8064.

CC: Linus Walleij <linus.walleij@linaro.org>
CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>
CC: "Ivan T. Ivanov" <iivanov@mm-sol.com>
CC: Stephen Boyd <sboyd@codeaurora.org>
CC: Andy Gross <agross@codeaurora.org>
Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 drivers/pinctrl/qcom/pinctrl-apq8064.c |    7 +++++-
 drivers/pinctrl/qcom/pinctrl-msm.c     |   38 ++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-apq8064.c b/drivers/pinctrl/qcom/pinctrl-apq8064.c
index feb6f15..ef1263c 100644
--- a/drivers/pinctrl/qcom/pinctrl-apq8064.c
+++ b/drivers/pinctrl/qcom/pinctrl-apq8064.c
@@ -324,6 +324,7 @@ enum apq8064_functions {
 	APQ_MUX_tsif1,
 	APQ_MUX_tsif2,
 	APQ_MUX_usb2_hsic,
+	APQ_MUX_ps_hold,
 	APQ_MUX_NA,
 };
 
@@ -351,6 +352,9 @@ static const char * const gpio_groups[] = {
 	"gpio78", "gpio79", "gpio80", "gpio81", "gpio82", "gpio83", "gpio84",
 	"gpio85", "gpio86", "gpio87", "gpio88", "gpio89"
 };
+static const char * const ps_hold_groups[] = {
+	"gpio78"
+};
 static const char * const gsbi1_groups[] = {
 	"gpio18", "gpio19", "gpio20", "gpio21"
 };
@@ -477,6 +481,7 @@ static const struct msm_function apq8064_functions[] = {
 	FUNCTION(tsif1),
 	FUNCTION(tsif2),
 	FUNCTION(usb2_hsic),
+	FUNCTION(ps_hold),
 };
 
 static const struct msm_pingroup apq8064_groups[] = {
@@ -558,7 +563,7 @@ static const struct msm_pingroup apq8064_groups[] = {
 	PINGROUP(75, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
 	PINGROUP(76, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
 	PINGROUP(77, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
-	PINGROUP(78, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
+	PINGROUP(78, ps_hold, NA, NA, NA, NA, NA, NA, NA, NA, NA),
 	PINGROUP(79, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
 	PINGROUP(80, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
 	PINGROUP(81, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 2738108..be43e7a 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -12,6 +12,7 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -27,12 +28,17 @@
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 
+#include <asm/system_misc.h>
+
 #include "../core.h"
 #include "../pinconf.h"
 #include "pinctrl-msm.h"
 #include "../pinctrl-utils.h"
 
 #define MAX_NR_GPIO 300
+#define PS_HOLD_OFFSET 0x820
+
+static void __iomem *msm_ps_hold;
 
 /**
  * struct msm_pinctrl - state for a pinctrl-msm device
@@ -848,10 +854,31 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
 	return 0;
 }
 
+static void qcom_reset(enum reboot_mode reboot_mode, const char *cmd)
+{
+	writel(0, msm_ps_hold);
+	mdelay(10000);
+}
+
+const struct msm_function
+*find_pshold_function(const struct msm_function *functions,
+					unsigned nfunctions, const char *name)
+{
+	int i = 0;
+	const struct msm_function *func;
+
+	for (func = functions; i <= nfunctions; func++, i++)
+		if (!strcmp(func->name, name))
+			return func;
+
+	return NULL;
+}
+
 int msm_pinctrl_probe(struct platform_device *pdev,
 		      const struct msm_pinctrl_soc_data *soc_data)
 {
 	struct msm_pinctrl *pctrl;
+	const struct msm_function *func;
 	struct resource *res;
 	int ret;
 
@@ -871,6 +898,17 @@ int msm_pinctrl_probe(struct platform_device *pdev,
 	if (IS_ERR(pctrl->regs))
 		return PTR_ERR(pctrl->regs);
 
+#ifdef CONFIG_ARM
+	func = find_pshold_function(soc_data->functions,
+					soc_data->nfunctions, "ps_hold");
+	if (func) {
+		dev_dbg(&pdev->dev, "Found Function %s\n", func->name);
+		msm_ps_hold = pctrl->regs + PS_HOLD_OFFSET;
+		arm_pm_restart = qcom_reset;
+	}
+#else
+#error "not supported on this arch"
+#endif
 	pctrl->irq = platform_get_irq(pdev, 0);
 	if (pctrl->irq < 0) {
 		dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
-- 
1.7.0.4

Re: [PATCH 4/4] pinctrl: qcom: Add support for reset for apq8064

[Pramod Gurav]

Hi Bjorn,

On 29-08-2014 06:58 AM, Bjorn Andersson wrote:
> On Thu 28 Aug 20:22 PDT 2014, Pramod Gurav wrote:
> 
>> This patch adds support for reset functions to reboot the boards
>> with soc apq8064.
>>
>> CC: Linus Walleij <linus.walleij@linaro.org>
>> CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>
>> CC: "Ivan T. Ivanov" <iivanov@mm-sol.com>
>> CC: Stephen Boyd <sboyd@codeaurora.org>
>> CC: Andy Gross <agross@codeaurora.org>
>> Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
>> ---
>>  drivers/pinctrl/qcom/pinctrl-apq8064.c |    7 +++++-
>>  drivers/pinctrl/qcom/pinctrl-msm.c     |   38 ++++++++++++++++++++++++++++++++
>>  2 files changed, 44 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-apq8064.c b/drivers/pinctrl/qcom/pinctrl-apq8064.c
>> index feb6f15..ef1263c 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-apq8064.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-apq8064.c
>> @@ -324,6 +324,7 @@ enum apq8064_functions {
>>  	APQ_MUX_tsif1,
>>  	APQ_MUX_tsif2,
>>  	APQ_MUX_usb2_hsic,
>> +	APQ_MUX_ps_hold,
>>  	APQ_MUX_NA,
>>  };
>>  
>> @@ -351,6 +352,9 @@ static const char * const gpio_groups[] = {
>>  	"gpio78", "gpio79", "gpio80", "gpio81", "gpio82", "gpio83", "gpio84",
>>  	"gpio85", "gpio86", "gpio87", "gpio88", "gpio89"
>>  };
>> +static const char * const ps_hold_groups[] = {
>> +	"gpio78"
>> +};
>>  static const char * const gsbi1_groups[] = {
>>  	"gpio18", "gpio19", "gpio20", "gpio21"
>>  };
>> @@ -477,6 +481,7 @@ static const struct msm_function apq8064_functions[] = {
>>  	FUNCTION(tsif1),
>>  	FUNCTION(tsif2),
>>  	FUNCTION(usb2_hsic),
>> +	FUNCTION(ps_hold),
>>  };
>>  
>>  static const struct msm_pingroup apq8064_groups[] = {
>> @@ -558,7 +563,7 @@ static const struct msm_pingroup apq8064_groups[] = {
>>  	PINGROUP(75, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>>  	PINGROUP(76, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>>  	PINGROUP(77, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>> -	PINGROUP(78, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>> +	PINGROUP(78, ps_hold, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>>  	PINGROUP(79, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>>  	PINGROUP(80, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>>  	PINGROUP(81, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
>> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
>> index 2738108..be43e7a 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
>> @@ -12,6 +12,7 @@
>>   * GNU General Public License for more details.
>>   */
>>  
>> +#include <linux/delay.h>
>>  #include <linux/err.h>
>>  #include <linux/io.h>
>>  #include <linux/module.h>
>> @@ -27,12 +28,17 @@
>>  #include <linux/interrupt.h>
>>  #include <linux/spinlock.h>
>>  
>> +#include <asm/system_misc.h>
>> +
>>  #include "../core.h"
>>  #include "../pinconf.h"
>>  #include "pinctrl-msm.h"
>>  #include "../pinctrl-utils.h"
>>  
>>  #define MAX_NR_GPIO 300
>> +#define PS_HOLD_OFFSET 0x820
>> +
>> +static void __iomem *msm_ps_hold;
>>  
>>  /**
>>   * struct msm_pinctrl - state for a pinctrl-msm device
>> @@ -848,10 +854,31 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
>>  	return 0;
>>  }
>>  
>> +static void qcom_reset(enum reboot_mode reboot_mode, const char *cmd)
> 
> This doesn't follow the naming used in this.
> 
>> +{
>> +	writel(0, msm_ps_hold);
>> +	mdelay(10000);
> 
> Why 10 seconds? What happens after that?

This I copied from existing msm-poweroff.c driver for apq8074. Not sure
why such a long delay. I will exclude this from mine as I have no valid
reason.

> 
>> +}
>> +
>> +const struct msm_function
>> +*find_pshold_function(const struct msm_function *functions,
>> +					unsigned nfunctions, const char *name)
> 
> This should be static. But that would cause a compile warning on non-ARM
> platforms, see below.
> 
>> +{
>> +	int i = 0;
>> +	const struct msm_function *func;
>> +
>> +	for (func = functions; i <= nfunctions; func++, i++)
> 
> Why do you have 'func' and why do you iterate over that and i?
> 
> for (i = 0; i < nfunctions; i++)
> 	if (strcmp(functions[i]->name, name) == 0)
> 		return true; (or &functions[i] if you really need it)
> 
> But as you only uses this once I would prefer if you just merge in the setting
> of msm_ps_hold and arm_pm_restart here as well, see below.
> 
>> +		if (!strcmp(func->name, name))
>> +			return func;
>> +
>> +	return NULL;
>> +}
>> +
>>  int msm_pinctrl_probe(struct platform_device *pdev,
>>  		      const struct msm_pinctrl_soc_data *soc_data)
>>  {
>>  	struct msm_pinctrl *pctrl;
>> +	const struct msm_function *func;
>>  	struct resource *res;
>>  	int ret;
>>  
>> @@ -871,6 +898,17 @@ int msm_pinctrl_probe(struct platform_device *pdev,
>>  	if (IS_ERR(pctrl->regs))
>>  		return PTR_ERR(pctrl->regs);
>>  
>> +#ifdef CONFIG_ARM
>> +	func = find_pshold_function(soc_data->functions,
>> +					soc_data->nfunctions, "ps_hold");
>> +	if (func) {
>> +		dev_dbg(&pdev->dev, "Found Function %s\n", func->name);
> 
> Guess what, it will print "ps_hold" here. I would prefer if you just skip this
> line, as this will always be true on 8960 and 8064.
> 
>> +		msm_ps_hold = pctrl->regs + PS_HOLD_OFFSET;
>> +		arm_pm_restart = qcom_reset;
>> +	}
>> +#else
>> +#error "not supported on this arch"
> 
> There is no reason for you to break compilation of this driver on non-ARM
> platforms. This #else/#error should be removed.
> 
> I would prefer if you did not #ifdef at all within the function, but rather
> merge this piece of logic with the search above into a static function that's
> surrounded by a check for CONFIG_ARM - providing a no-op for non-arm boards.
> 
> I.e
> 
> #ifdef CONFIG_ARM
> static void qcom_reset(enum reboot_mode reboot_mode, const char *cmd)
> {
> 	...
> }
> 
> static void msm_pinctrl_setup_pm_reset(pctrl)
> {
> 	...
> }
> #else
> static void msm_pinctrl_setup_pm_reset(pctrl) {}
> #endif

Will put this in a single function which takes pctrl and address you
comments there in v3.
Thanks for review. :-)
> 
>> +#endif
> 
> Regards,
> Bjorn
> 

[PATCH 3/4] pinctrl: msm: Add ps_hold function in pinctrl-apq8064 binding documentation

[Pramod Gurav]

This adds a function ps_hold (Power Suppy Hold Signal) in pinctrl-ap8064
documentation which was missing. This function is used to reset the targets
with apq8064 soc.

CC: Linus Walleij <linus.walleij@linaro.org>
CC: Bjorn Andersson <bjorn.andersson@sonymobile.com>
CC: "Ivan T. Ivanov" <iivanov@mm-sol.com>
CC: Stephen Boyd <sboyd@codeaurora.org>
CC: Andy Gross <agross@codeaurora.org>

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 .../bindings/pinctrl/qcom,apq8064-pinctrl.txt      |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
index 0211c6d..ca5bfa5 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,apq8064-pinctrl.txt
@@ -50,7 +50,7 @@ Valid values for function are:
   gsbi4_cam_i2c, gsbi5, gsbi5_spi_cs1, gsbi5_spi_cs2, gsbi5_spi_cs3, gsbi6,
   gsbi6_spi_cs1, gsbi6_spi_cs2, gsbi6_spi_cs3, gsbi7, gsbi7_spi_cs1,
   gsbi7_spi_cs2, gsbi7_spi_cs3, gsbi_cam_i2c, hdmi, mi2s, riva_bt, riva_fm,
-  riva_wlan, sdc2, sdc4, slimbus, spkr_i2s, tsif1, tsif2, usb2_hsic,
+  riva_wlan, sdc2, sdc4, slimbus, spkr_i2s, tsif1, tsif2, usb2_hsic, ps_hold
 
 Example:
 
-- 
1.7.9.5