linux-kernel - Re: [PATCH 05/12] ARM: dts: imx6ul-isiot-common: Add touchscreen node

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Date:   Fri, 24 Mar 2017 12:29:49 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Jagan Teki <jagan@...nedev.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Matteo Lisi <matteo.lisi@...icam.com>,
        Michael Trimarchi <michael@...rulasolutions.com>
Subject: Re: [PATCH 05/12] ARM: dts: imx6ul-isiot-common: Add touchscreen node

On Fri, Mar 24, 2017 at 10:46 AM, Shawn Guo <shawnguo@...nel.org> wrote:
> On Wed, Mar 22, 2017 at 11:18:10PM +0530, Jagan Teki wrote:
>> From: Jagan Teki <jagan@...rulasolutions.com>
>>
>> Add touchscreen node as i2c1 slave device on Engicam Is.IoT MX6UL
>> modules, the touchscreen controlled 'st,stmpe-ts' connected via
>> i2c with st,stmpe811 mfb interface.
>
> s/mfb/mfd?
>
>>
>> Cc: Shawn Guo <shawnguo@...nel.org>
>> Cc: Matteo Lisi <matteo.lisi@...icam.com>
>> Cc: Michael Trimarchi <michael@...rulasolutions.com>
>> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
>> ---
>>  arch/arm/boot/dts/imx6ul-isiot-common.dtsi | 34 ++++++++++++++++++++++++++++++
>>  1 file changed, 34 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/imx6ul-isiot-common.dtsi b/arch/arm/boot/dts/imx6ul-isiot-common.dtsi
>> index 9660e20..b149b5e 100644
>> --- a/arch/arm/boot/dts/imx6ul-isiot-common.dtsi
>> +++ b/arch/arm/boot/dts/imx6ul-isiot-common.dtsi
>> @@ -40,6 +40,34 @@
>>   *     OTHER DEALINGS IN THE SOFTWARE.
>>   */
>>
>> +&i2c1 {
>> +     touch: stmpe811@44 {
>
> Label a MFD device 'touch'?  Also, the node name should be generic.  Not
> sure what should be used for MFD device though.

May be I can use stmpe811@41 the existing imx6qdl-apalis.dtsi using
the similar notation.

>
>> +             compatible = "st,stmpe811";
>> +             reg = <0x44>;
>> +             #address-cells = <1>;
>> +             #size-cells = <0>;
>> +             pinctrl-names = "default";
>> +             pinctrl-0 = <&pinctrl_stmpe_ts>;
>
> If this is for stmpe-ts, shouldn't be put into touchscreen child node?

Actually this is interrupt pad, for the touch controller via stmpe so
I can rename pinctrl_touch_int.

>
>> +             interrupt-parent = <&gpio1>;
>> +             interrupts = <18 IRQ_TYPE_EDGE_FALLING>;
>> +             interrupt-controller;
>> +             #interrupt-cells = <2>;
>> +
>> +             stmpe_touchscreen {
>
> 'stmpe: touchscreen {' might be better.

stmpe_touchscreen {

This is also compatible with existing dtsi files

thanks!
-- 
Jagan Teki
Senior Linux Kernel Engineer | Amarula Solutions
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.