pwm: pwm-tiehrpwm: pinctrl support

Enable pinctrl for pwm-tiehrpwm if pinctrl driver available, else
bail out with warning message.

Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

drivers/pwm/pwm-tiehrpwm.c

@@ -26,6 +26,7 @@
 #include <linux/clk.h>
 #include <linux/pm_runtime.h>
 #include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
 
 #include "pwm-tipwmss.h"
 
@@ -415,6 +416,11 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev)
 	struct clk *clk;
 	struct ehrpwm_pwm_chip *pc;
 	u16 status;
+	struct pinctrl *pinctrl;
+
+	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+	if (IS_ERR(pinctrl))
+		dev_warn(&pdev->dev, "unable to select pin group\n");
 
 	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
 	if (!pc) {