[PATCH v2] leds-pca963x: add bindings to invert polarity

[Anders Darander]

Add a new DT property, nxp,inverted-out, to invert the polarity of the output.

Tested on PCA9634.

Signed-off-by: Anders Darander <and...@chargestorm.se>
---
 Documentation/devicetree/bindings/leds/pca963x.txt |  1 +
 drivers/leds/leds-pca963x.c                        | 17 +++++++++++++++--
 include/linux/platform_data/leds-pca963x.h         |  6 ++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/pca963x.txt 
b/Documentation/devicetree/bindings/leds/pca963x.txt
index dfbdb123a9bf..4eee41482041 100644
--- a/Documentation/devicetree/bindings/leds/pca963x.txt
+++ b/Documentation/devicetree/bindings/leds/pca963x.txt
@@ -10,6 +10,7 @@ Optional properties:
 - nxp,period-scale : In some configurations, the chip blinks faster than 
expected.
                     This parameter provides a scaling ratio (fixed point, 
decimal divided
                     by 1000) to compensate, e.g. 1300=1.3x and 750=0.75x.
+- nxp,inverted-out: invert the polarity of the generated PWM
 
 Each led is represented as a sub-node of the nxp,pca963x device.
 
diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index ded1e4dac36a..3bf9a1271819 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -342,6 +342,12 @@ pca963x_dt_init(struct i2c_client *client, struct 
pca963x_chipdef *chip)
        if (of_property_read_u32(np, "nxp,period-scale", &chip->scaling))
                chip->scaling = 1000;
 
+       /* default to non-inverted output, unless inverted is specified */
+       if (of_property_read_bool(np, "nxp,inverted-out"))
+               pdata->dir = PCA963X_INVERTED;
+       else
+               pdata->dir = PCA963X_NORMAL;
+
        return pdata;
 }
 
@@ -452,11 +458,18 @@ static int pca963x_probe(struct i2c_client *client,
        i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
 
        if (pdata) {
+               u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
+                                                   PCA963X_MODE2);
                /* Configure output: open-drain or totem pole (push-pull) */
                if (pdata->outdrv == PCA963X_OPEN_DRAIN)
-                       i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);
+                       mode2 |= 0x01;
                else
-                       i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x05);
+                       mode2 |= 0x05;
+               /* Configure direction: normal or inverted */
+               if (pdata->dir == PCA963X_INVERTED)
+                       mode2 |= 0x10;
+               i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
+                                         mode2);
        }
 
        return 0;
diff --git a/include/linux/platform_data/leds-pca963x.h 
b/include/linux/platform_data/leds-pca963x.h
index e731f0036329..54e845ffb5ed 100644
--- a/include/linux/platform_data/leds-pca963x.h
+++ b/include/linux/platform_data/leds-pca963x.h
@@ -33,10 +33,16 @@ enum pca963x_blink_type {
        PCA963X_HW_BLINK,
 };
 
+enum pca963x_direction {
+       PCA963X_NORMAL,
+       PCA963X_INVERTED,
+};
+
 struct pca963x_platform_data {
        struct led_platform_data leds;
        enum pca963x_outdrv outdrv;
        enum pca963x_blink_type blink_type;
+       enum pca963x_direction dir;
 };
 
 #endif /* __LINUX_PCA963X_H*/
-- 
2.11.0