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

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  [PATCH v2] leds-pca963x: add bindings to invert polarity Anders Darander <anders@chargestorm.se> - 2017-04-27 08:40 +0200
    Re: [PATCH v2] leds-pca963x: add bindings to invert polarity Anders Darander <anders@chargestorm.se> - 2017-04-27 08:50 +0200
    Re: [PATCH v2] leds-pca963x: add bindings to invert polarity Pavel Machek <pavel@ucw.cz> - 2017-04-27 14:00 +0200
    Re: [PATCH v2] leds-pca963x: add bindings to invert polarity Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-04-27 21:10 +0200

#1631892 — [PATCH v2] leds-pca963x: add bindings to invert polarity

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

Tested on PCA9634.

Signed-off-by: Anders Darander <anders@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

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#1631902

Hi all,

* Anders Darander <anders@chargestorm.se> [170427 08:37]:
> Add a new DT property, nxp,inverted-out, to invert the polarity of the output.
> Tested on PCA9634.

I'm making a 2nd attempt at this. The ability to invert the output from
the PCA9634 is important, and I'd like to avoid out-of-tree patches as
much as possible.

In replies to my previous attempt [1] another attempt at adding this
support was mentioned [2]. However, that attempt seems to have stalled
[3]. Even if the rest of the fixes / improvements from that series
aren't merged, I'd like to see the support for the inverted output.

Cheers,
Anders

[1] https://lkml.org/lkml/2016/5/4/120
[2] https://lkml.org/lkml/2016/4/19/90
[3] https://lkml.org/lkml/2016/9/6/187

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#1632054

[Multipart message — attachments visible in raw view] — view raw

On Thu 2017-04-27 08:37:33, Anders Darander wrote:
> Add a new DT property, nxp,inverted-out, to invert the polarity of the output.
> 
> Tested on PCA9634.
> 
> Signed-off-by: Anders Darander <anders@chargestorm.se>

Acked-by: Pavel Machek <pavel@ucw.cz>
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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#1632337

Hi Anders,

On 04/27/2017 08:37 AM, Anders Darander wrote:
> Add a new DT property, nxp,inverted-out, to invert the polarity of the output.
> 
> Tested on PCA9634.
> 
> Signed-off-by: Anders Darander <anders@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*/
> 

Thanks for the patch.

Applied to the for-4.13 branch of linux-leds.git.

-- 
Best regards,
Jacek Anaszewski

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