pwm: Constify OF match tables

A few drivers already annotate this properly. Make the same change for
all other OF supporting drivers.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/pwm/pwm-lpc32xx.c

@@ -145,7 +145,7 @@ static int lpc32xx_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&lpc32xx->chip);
 }
 
-static struct of_device_id lpc32xx_pwm_dt_ids[] = {
+static const struct of_device_id lpc32xx_pwm_dt_ids[] = {
 	{ .compatible = "nxp,lpc3220-pwm", },
 	{ /* sentinel */ }
 };

drivers/pwm/pwm-mxs.c

@@ -179,7 +179,7 @@ static int mxs_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&mxs->chip);
 }
 
-static struct of_device_id mxs_pwm_dt_ids[] = {
+static const struct of_device_id mxs_pwm_dt_ids[] = {
 	{ .compatible = "fsl,imx23-pwm", },
 	{ /* sentinel */ }
 };

drivers/pwm/pwm-spear.c

@@ -248,7 +248,7 @@ static int spear_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&pc->chip);
 }
 
-static struct of_device_id spear_pwm_of_match[] = {
+static const struct of_device_id spear_pwm_of_match[] = {
 	{ .compatible = "st,spear320-pwm" },
 	{ .compatible = "st,spear1340-pwm" },
 	{ }

drivers/pwm/pwm-tegra.c

@@ -233,7 +233,7 @@ static int tegra_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&pc->chip);
 }
 
-static struct of_device_id tegra_pwm_of_match[] = {
+static const struct of_device_id tegra_pwm_of_match[] = {
 	{ .compatible = "nvidia,tegra20-pwm" },
 	{ .compatible = "nvidia,tegra30-pwm" },
 	{ }

drivers/pwm/pwm-twl-led.c

@@ -323,7 +323,7 @@ static int twl_pwmled_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id twl_pwmled_of_match[] = {
+static const struct of_device_id twl_pwmled_of_match[] = {
 	{ .compatible = "ti,twl4030-pwmled" },
 	{ .compatible = "ti,twl6030-pwmled" },
 	{ },

drivers/pwm/pwm-twl.c

@@ -335,7 +335,7 @@ static int twl_pwm_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id twl_pwm_of_match[] = {
+static const struct of_device_id twl_pwm_of_match[] = {
 	{ .compatible = "ti,twl4030-pwm" },
 	{ .compatible = "ti,twl6030-pwm" },
 	{ },