Re: [alsa-devel] [PATCH 1/9] ASoC: tlv320aic31xx: Fix typo in DT binding documentation

Hi Andrew,

On Wed, 2017-11-08 at 15:24 -0600, Andrew F. Davis wrote:

The property used to specify a GPIO intended for reset is "reset-gpio", this binding uses "gpio-reset", as almost all other bindings use the former name this use of the latter is certainly not intended and was a typo. It is not compatible with newer methods used to fetch GPIO pins and to prevent the spread of this error to other bindings lets fix this here.

We also standardize the pin as active-low, different device trees have marked the GPIO different ways, luckily the driver currently uses the low-level GPIO set function which does not respect the active-low flag, but future changes may change this. This is an active-low reset, mark it as such.

Lastly, add an example of use for this property.

Fixes: e00447fafbf7 ("ASoC: tlv320aic31xx: Add basic codec driver implementation")

Signed-off-by: Andrew F. Davis afd@ti.com

Documentation/devicetree/bindings/sound/tlv320aic31xx.txt | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt b/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt index 6fbba562eaa7..4c4e77f97d87 100644 --- a/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt +++ b/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt @@ -22,7 +22,7 @@ Required properties:

Optional properties:

-- gpio-reset - gpio pin number used for codec reset

I would move this into a "Deprecated properties:" section instead of just hiding it away.

+- reset-gpio - GPIO specification for the active low RESET input.

This should be "reset-gpios". For reference, see Documentation/devicetree/bindings/gpio/gpio.txt.

• ai31xx-micbias-vg - MicBias Voltage setting 1 or MICBIAS_2_0V - MICBIAS output is powered to 2.0V 2 or MICBIAS_2_5V - MICBIAS output is powered to 2.5V

@@ -48,6 +48,7 @@ CODEC input pins: The pins can be used in referring sound node's audio-routing property.

Example: +#include <dt-bindings/gpio/gpio.h> #include <dt-bindings/sound/tlv320aic31xx-micbias.h>

tlv320aic31xx: tlv320aic31xx@18 { @@ -56,6 +57,8 @@ tlv320aic31xx: tlv320aic31xx@18 {

ai31xx-micbias-vg = <MICBIAS_OFF>;

• reset-gpio = <&gpio1 17 GPIO_ACTIVE_LOW>;
• HPVDD-supply = <&regulator>; SPRVDD-supply = <&regulator>; SPLVDD-supply = <&regulator>;

regards Philipp