arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

[PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Emanuele Ghidoli 2 months, 2 weeks ago

From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>

The device tree defines the touchscreen controller, but it cannot be
enabled because it lacks a reference label.
This commit adds a label to allow it to be referenced and enabled.

Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
---
 arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi b/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
index edba5b582414..4ea47a576b1c 100644
--- a/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
@@ -166,7 +166,7 @@ sgtl5000_a: audio-codec@a {
 	};
 
 	/* Touch controller */
-	touchscreen@2c {
+	ad7879_ts: touchscreen@2c {
 		compatible = "adi,ad7879-1";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_ad7879_int>;
-- 
2.34.1

Re: [PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Shawn Guo 1 month, 2 weeks ago

On Tue, Sep 10, 2024 at 05:22:12PM +0200, Emanuele Ghidoli wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
> 
> The device tree defines the touchscreen controller, but it cannot be
> enabled because it lacks a reference label.
> This commit adds a label to allow it to be referenced and enabled.
> 
> Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>

Applied, thanks!

Re: [PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Krzysztof Kozlowski 2 months, 2 weeks ago

On 10/09/2024 17:22, Emanuele Ghidoli wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
> 
> The device tree defines the touchscreen controller, but it cannot be
> enabled because it lacks a reference label.

It can be. Just enable it...

> This commit adds a label to allow it to be referenced and enabled.
> 

You changed here nothing. For me this patch is churn and pointless.

You add the label when you need to use it.

Best regards,
Krzysztof

Re: [PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Francesco Dolcini 2 months, 1 week ago

Hello Krzysztof,
it seems that this patch requires more explanation, maybe something
that should be part of the commit message, let's see ...

On Mon, Sep 16, 2024 at 06:10:55PM +0200, Krzysztof Kozlowski wrote:
> On 10/09/2024 17:22, Emanuele Ghidoli wrote:
> > From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
> > 
> > The device tree defines the touchscreen controller, but it cannot be
> > enabled because it lacks a reference label.
> 
> It can be. Just enable it...

colibri-imx8x is a SoM, it's not a complete self-contained device. The
display touch controller is part of the SoM, however it is kept disabled
since you need an actual touchscreen to make any use of it.

This label would be used where an actual touchscreen is defined, this can
happen with a DT overlay, for example.

> > This commit adds a label to allow it to be referenced and enabled.
> 
> You changed here nothing. For me this patch is churn and pointless.
> You add the label when you need to use it.

DT files from the Linux kernel GIT are used also outside the Linux kernel
sources, see for example U-Boot OF_UPSTREAM [1], to me it's fair to add
a label for an out-of-tree user, am I wrong?

Francesco

[1] https://lore.kernel.org/all/20240222093607.3085545-1-sumit.garg@linaro.org/

Re: [PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Krzysztof Kozlowski 2 months, 1 week ago

On 17/09/2024 09:45, Francesco Dolcini wrote:
> Hello Krzysztof,
> it seems that this patch requires more explanation, maybe something
> that should be part of the commit message, let's see ...
> 
> On Mon, Sep 16, 2024 at 06:10:55PM +0200, Krzysztof Kozlowski wrote:
>> On 10/09/2024 17:22, Emanuele Ghidoli wrote:
>>> From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
>>>
>>> The device tree defines the touchscreen controller, but it cannot be
>>> enabled because it lacks a reference label.
>>
>> It can be. Just enable it...
> 
> colibri-imx8x is a SoM, it's not a complete self-contained device. The
> display touch controller is part of the SoM, however it is kept disabled
> since you need an actual touchscreen to make any use of it.
> 
> This label would be used where an actual touchscreen is defined, this can
> happen with a DT overlay, for example.

DT overlay should be in the tree.

> 
>>> This commit adds a label to allow it to be referenced and enabled.
>>
>> You changed here nothing. For me this patch is churn and pointless.
>> You add the label when you need to use it.
> 
> DT files from the Linux kernel GIT are used also outside the Linux kernel
> sources, see for example U-Boot OF_UPSTREAM [1], to me it's fair to add
> a label for an out-of-tree user, am I wrong?


For U-Boot or any other upstream project: yes. It's enough to point to
lore patch or lore link. For downstream projects: I don't care, just
churn. Downstream should upstream their stuff to be considered.

Best regards,
Krzysztof

Re: [PATCH v1] arm64: dts: colibri-imx8x: Add ad7879_ts label to touchscreen controller

Posted by Francesco Dolcini 2 months, 1 week ago

On Tue, Sep 17, 2024 at 10:21:16AM +0200, Krzysztof Kozlowski wrote:
> On 17/09/2024 09:45, Francesco Dolcini wrote:
> > On Mon, Sep 16, 2024 at 06:10:55PM +0200, Krzysztof Kozlowski wrote:
> >> On 10/09/2024 17:22, Emanuele Ghidoli wrote:
> >>> From: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
> >>>
> >>> The device tree defines the touchscreen controller, but it cannot be
> >>> enabled because it lacks a reference label.
> >>
> >> It can be. Just enable it...
> > 
> > colibri-imx8x is a SoM, it's not a complete self-contained device. The
> > display touch controller is part of the SoM, however it is kept disabled
> > since you need an actual touchscreen to make any use of it.
> > 
> > This label would be used where an actual touchscreen is defined, this can
> > happen with a DT overlay, for example.
> 
> DT overlay should be in the tree.
> 
> > 
> >>> This commit adds a label to allow it to be referenced and enabled.
> >>
> >> You changed here nothing. For me this patch is churn and pointless.
> >> You add the label when you need to use it.
> > 
> > DT files from the Linux kernel GIT are used also outside the Linux kernel
> > sources, see for example U-Boot OF_UPSTREAM [1], to me it's fair to add
> > a label for an out-of-tree user, am I wrong?
> 
> 
> For U-Boot or any other upstream project: yes. It's enough to point to
> lore patch or lore link. For downstream projects: I don't care, just
> churn. Downstream should upstream their stuff to be considered.

In the specific case this is a SOM dtsi that can be included in an
actual whole self-contained product DTS file. It's not just about DT overlay.

In the Linux kernel DT files we do have labels all the time into SOC
dtsi files to allow the actual board user to augment/edit the node,
even when not used (yet). As a user of SOC dtsi file this is great
to me, and the same reasoning just apply to a SOM dtsi.

While I understand you do not care, IMO it has some valid use case and
should be considered for merging.

Francesco