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Subject[PATCH 5/6] leds: pca963x: Inform the output that it is inverted
Date
When leds are connected in a totem-pole configuration, they can be
connected either in a active-high, or active-low manor. The driver
currently always assumes active-high. This patch adds the
'nxp,inverted-out' boolean property to tell the driver that the leds
are driven active-low, or rather, that the behavior is inverted to what
is normally expected.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
---
Documentation/devicetree/bindings/leds/pca963x.txt | 1 +
drivers/leds/leds-pca963x.c | 20 +++++++++++++-------
include/linux/platform_data/leds-pca963x.h | 1 +
3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/pca963x.txt b/Documentation/devicetree/bindings/leds/pca963x.txt
index dafbe99..7b23725 100644
--- a/Documentation/devicetree/bindings/leds/pca963x.txt
+++ b/Documentation/devicetree/bindings/leds/pca963x.txt
@@ -6,6 +6,7 @@ Required properties:
Optional properties:
- nxp,totem-pole : use totem pole (push-pull) instead of open-drain (pca9632 defaults
to open-drain, newer chips to totem pole)
+ nxp,inverted-out: the connected leds are active-low, default to active-high
- nxp,hw-blink : use hardware blinking instead of software blinking

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 14690f2..85dd506 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -370,6 +370,9 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
else
pdata->outdrv = PCA963X_OPEN_DRAIN;

+ /* default to normal output unless inverted output is specified */
+ pdata->inverted_out = of_property_read_bool(np, "nxp,inverted-out");
+
/* default to software blinking unless hardware blinking is specified */
if (of_property_read_bool(np, "nxp,hw-blink"))
pdata->blink_type = PCA963X_HW_BLINK;
@@ -478,14 +481,17 @@ static int pca963x_probe(struct i2c_client *client,
i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);

if (pdata) {
+ /* Always enable LED output */
+ u8 mode2 = PCA963X_MODE2_OUTNE_OUTDRV;
+
/* Configure output: open-drain or totem pole (push-pull) */
- if (pdata->outdrv == PCA963X_OPEN_DRAIN)
- i2c_smbus_write_byte_data(client, PCA963X_MODE2,
- PCA963X_MODE2_OUTNE_OUTDRV);
- else
- i2c_smbus_write_byte_data(client, PCA963X_MODE2,
- PCA963X_MODE2_OUTNE_OUTDRV |
- PCA963X_MODE2_OUTDRV_TOTEM_POLE);
+ if (pdata->outdrv == PCA963X_TOTEM_POLE)
+ mode2 |= PCA963X_MODE2_OUTDRV_TOTEM_POLE;
+ /* Configure output: inverted output */
+ if (pdata->inverted_out)
+ mode2 |= PCA963X_MODE2_INVRT;
+
+ i2c_smbus_write_byte_data(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 e731f00..6f784d4 100644
--- a/include/linux/platform_data/leds-pca963x.h
+++ b/include/linux/platform_data/leds-pca963x.h
@@ -36,6 +36,7 @@ enum pca963x_blink_type {
struct pca963x_platform_data {
struct led_platform_data leds;
enum pca963x_outdrv outdrv;
+ bool inverted_out;
enum pca963x_blink_type blink_type;
};

--
2.8.0.rc3
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