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

From: Bjorn Andersson <hidden>
Date: 2014-08-29 01:28:26
Also in: linux-arm-msm, lkml

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

quoted hunk ↗ jump to hunk

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

CC: Linus Walleij <redacted>
CC: Bjorn Andersson <redacted>
CC: "Ivan T. Ivanov" <redacted>
CC: Stephen Boyd <redacted>
CC: Andy Gross <redacted>
Signed-off-by: Pramod Gurav <redacted>
---
 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.

quoted hunk ↗ jump to hunk

+		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

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