linux-kernel - Re: [PATCH v2] arm: dts: imx6qdl: add gpio expander pca9535

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Date:   Thu, 12 Sep 2019 06:01:54 -0400 (EDT)
From:   Gilles Doffe <gilles.doffe@...oirfairelinux.com>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        mark rutland <mark.rutland@....com>,
        festevam <festevam@...il.com>, s hauer <s.hauer@...gutronix.de>,
        rennes <rennes@...oirfairelinux.com>,
        robh+dt <robh+dt@...nel.org>, linux-imx <linux-imx@....com>,
        kernel <kernel@...gutronix.de>,
        Jérome Oufella 
        <jerome.oufella@...oirfairelinux.com>,
        shawnguo <shawnguo@...nel.org>
Subject: Re: [PATCH v2] arm: dts: imx6qdl: add gpio expander pca9535

Hi Marco,

Thanks for your reply and sorry about the delay.

----- Le 22 Juil 19, à 9:53, Marco Felsch m.felsch@...gutronix.de a écrit :

> Hi Gilles,
> 
> can you adapt the patch title, I assumed that the base dtsi is adding a
> gpio-expander which makes no sense.

My first intent was to add the gpio-expander pca9535 into the imx6q-rex-pro.dts and in a future imx6qp-rex-ultra.dts
However I noticed that the sgtl5000 was already in the dtsi.
It is maybe due to the fact that like the pca9535, the sgtl5000 is present on the baseboard not on the SOM.
Thus I guess that baseboard stuff common to all rex SOM should be in imx6qdl-rex.dtsi and not in the dts.
Does-it seem correct to you ?

> 
> On 19-07-19 12:46, Gilles DOFFE wrote:
>> The pca9535 gpio expander is present on the Rex baseboard, but missing
>> from the dtsi.
>> 
>> Add the new gpio controller and the associated interrupt line
>> MX6QDL_PAD_NANDF_CS3__GPIO6_IO16.
>> 
>> Signed-off-by: Gilles DOFFE <gilles.doffe@...oirfairelinux.com>
>> ---
> 
> Having a changelog would be nice too.
> 
>>  arch/arm/boot/dts/imx6qdl-rex.dtsi | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>> 
>> diff --git a/arch/arm/boot/dts/imx6qdl-rex.dtsi
>> b/arch/arm/boot/dts/imx6qdl-rex.dtsi
>> index 97f1659144ea..b517efb22fcb 100644
>> --- a/arch/arm/boot/dts/imx6qdl-rex.dtsi
>> +++ b/arch/arm/boot/dts/imx6qdl-rex.dtsi
>> @@ -136,6 +136,19 @@
>>  		compatible = "atmel,24c02";
>>  		reg = <0x57>;
>>  	};
>> +
>> +	pca9535: gpio8@27 {
>> +		compatible = "nxp,pca9535";
>> +		reg = <0x27>;
> 
> The i2c devices are orderd by their i2c-addresses starting from the
> lowest.
>

Ack.

>> +		gpio-controller;
>> +		#gpio-cells = <2>;
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&pinctrl_pca9535>;
>> +		interrupt-parent = <&gpio6>;
>> +		interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
>> +		interrupt-controller;
>> +		#interrupt-cells = <2>;
>> +	};
>>  };
>>  
>>  &i2c3 {
>> @@ -237,6 +250,12 @@
>>  			>;
>>  		};
>>  
>> +		pinctrl_pca9535: pca9535 {
>> +			fsl,pins = <
>> +				MX6QDL_PAD_NANDF_CS3__GPIO6_IO16	0x00017059
> 
> The pinmux below don't use the leading zero's if you are the first I
> would drop that.
> 
> Regards,
>  Marco
>

Ack.

Regards,
Gilles