[PATCHv4 06/10] mfd: ti-lmu: add PWM support

[Sebastian Reichel <sebastian.reichel@collabora.co.uk>]

This adds support to acquire the optional PWM channel,
that can be used by some of the LMU variants.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
---
 drivers/mfd/ti-lmu.c       | 11 +++++++++++
 include/linux/mfd/ti-lmu.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c
index ce16c896879b..f43b8acc30e1 100644
--- a/drivers/mfd/ti-lmu.c
+++ b/drivers/mfd/ti-lmu.c
@@ -183,6 +183,17 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 		return ret;
 	}
 
+	lmu->pwm = devm_pwm_get(dev, "lmu-backlight");
+	if (IS_ERR(lmu->pwm)) {
+		ret = PTR_ERR(lmu->pwm);
+		if (ret != -EINVAL) {
+			dev_err(dev, "Failed to get PWM: %d\n", ret);
+			return ret;
+		}
+
+		lmu->pwm = NULL;
+	}
+
 	ret = ti_lmu_enable_hw(lmu, id->driver_data);
 	if (ret)
 		return ret;
diff --git a/include/linux/mfd/ti-lmu.h b/include/linux/mfd/ti-lmu.h
index 1ef51ed36be5..246ab5145dff 100644
--- a/include/linux/mfd/ti-lmu.h
+++ b/include/linux/mfd/ti-lmu.h
@@ -17,6 +17,7 @@
 #include <linux/notifier.h>
 #include <linux/regmap.h>
 #include <linux/gpio/consumer.h>
+#include <linux/pwm.h>
 
 /* Notifier event */
 #define LMU_EVENT_MONITOR_DONE		0x01
@@ -77,12 +78,14 @@ enum lm363x_regulator_id {
  * @dev:	Parent device pointer
  * @regmap:	Used for i2c communcation on accessing registers
  * @en_gpio:	GPIO for HWEN pin [Optional]
+ * @pwm:	PWM for module [Optional]
  * @notifier:	Notifier for reporting hwmon event
  */
 struct ti_lmu {
 	struct device *dev;
 	struct regmap *regmap;
 	struct gpio_desc *en_gpio;
+	struct pwm_device *pwm;
 	struct blocking_notifier_head notifier;
 };
 #endif
-- 
2.16.2