[PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[Shengjiu Wang]

Headphone detection is triggered by GPIO, then driver can
switch between speaker and headphone.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 arch/arm/boot/dts/imx6sx-sdb.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/imx6sx-sdb.dtsi b/arch/arm/boot/dts/imx6sx-sdb.dtsi
index 3e5fb72f21fc..15f486a15f24 100644
--- a/arch/arm/boot/dts/imx6sx-sdb.dtsi
+++ b/arch/arm/boot/dts/imx6sx-sdb.dtsi
@@ -165,6 +165,7 @@ sound {
 			"IN3R", "AMIC";
 		mux-int-port = <2>;
 		mux-ext-port = <6>;
+		hp-det-gpio = <&gpio1 17 GPIO_ACTIVE_LOW>;
 	};
 
 	panel {
@@ -374,6 +375,9 @@ &wdog1 {
 
 &iomuxc {
 	imx6x-sdb {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_hog>;
+
 		pinctrl_audmux: audmuxgrp {
 			fsl,pins = <
 				MX6SX_PAD_CSI_DATA00__AUDMUX_AUD6_TXC	0x130b0
@@ -450,6 +454,12 @@ MX6SX_PAD_CSI_DATA05__GPIO1_IO_19 0x17059
 			>;
 		};
 
+		pinctrl_hog: hoggrp {
+			fsl,pins = <
+				MX6SX_PAD_CSI_DATA03__GPIO1_IO_17 0x17059
+			>;
+		};
+
 		pinctrl_i2c1: i2c1grp {
 			fsl,pins = <
 				MX6SX_PAD_GPIO1_IO01__I2C1_SDA		0x4001b8b1
-- 
2.27.0


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Re: [PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[Fabio Estevam]

Hi Shengjiu,

On Thu, Aug 6, 2020 at 8:55 AM Shengjiu Wang <shengjiu.wang@nxp.com> wrote:

>  &iomuxc {
>         imx6x-sdb {
> +               pinctrl-names = "default";
> +               pinctrl-0 = <&pinctrl_hog>;

Instead of adding a hog group, please add the headphone detect GPIO
under the audmux group like you did in the imx6sl-evk patch.

Thanks

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Re: [PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[Shawn Guo]

On Sun, Aug 23, 2020 at 11:12:08AM -0300, Fabio Estevam wrote:
> Hi Wang Shengjiu and Shawn,
> 
> On Sun, Aug 23, 2020 at 9:31 AM S.j. Wang <shengjiu.wang@nxp.com> wrote:
> 
> > I would like to know your opinion, should I move headphone detect GPIO
> > To audmux group?
> 
> What about adding a dedicated pinctrl_hp for the headphone detect pin
> like it is done at:
> https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git/tree/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi?h=for-next&id=8f0216b006e5f553d28c4c1a991b5234693a49cb#n130
> 
> My point is that we should avoid adding a hog group when possible.

I agree.  Hog group should be used as the last sort, when there is no
clear client device owning the pins.

Shawn

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Re: [PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[Fabio Estevam]

Hi Wang Shengjiu and Shawn,

On Sun, Aug 23, 2020 at 9:31 AM S.j. Wang <shengjiu.wang@nxp.com> wrote:

> I would like to know your opinion, should I move headphone detect GPIO
> To audmux group?

What about adding a dedicated pinctrl_hp for the headphone detect pin
like it is done at:
https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git/tree/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi?h=for-next&id=8f0216b006e5f553d28c4c1a991b5234693a49cb#n130

My point is that we should avoid adding a hog group when possible.

Thanks

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Re: [PATCH] ARM: dts: imx6sx-sdb: Add headphone detection for sound card

[Fabio Estevam]

On Mon, Aug 17, 2020 at 10:57 AM S.j. Wang <shengjiu.wang@nxp.com> wrote:

> I didn't put headphone detect GPIO in audmux group in imx6sl-evk patch,
> Still in hog group.

Ok, sorry. You grouped it with MX6SL_PAD_AUD_MCLK__AUDIO_CLK_OUT,
which I also think should not be part of the hog group.

> And I think headphone detect GPIO is not belong to audmux group, it should
> Be in hog group.

The hog group is better suited when there is no driver that can be
associated with that particular pin.

For the headphone GPIO detect, I think it makes sense to group it with
the other audio-related pinctrl pins.

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