pwm: Add device tree support

This patch adds helpers to support device tree bindings for the generic
PWM API. Device tree binding documentation for PWM controllers is also
provided.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 2947a4fea6ad..21d076c5089e 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -1,6 +1,8 @@
 #ifndef __LINUX_PWM_H
 #define __LINUX_PWM_H
 
+#include <linux/of.h>
+
 struct pwm_device;
 struct seq_file;
 
@@ -105,6 +107,10 @@ struct pwm_chip {
         unsigned int            npwm;
 
         struct pwm_device       *pwms;
+
+        struct pwm_device *     (*of_xlate)(struct pwm_chip *pc,
+                                            const struct of_phandle_args *args);
+        unsigned int            of_pwm_n_cells;
 };
 
 int pwm_set_chip_data(struct pwm_device *pwm, void *data);