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

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Date:   Thu, 12 Sep 2019 12:12:40 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Gilles Doffe <gilles.doffe@...oirfairelinux.com>
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 Gilles,

On 19-09-12 06:01, Gilles Doffe wrote:
> Hi Marco,
> 
> Thanks for your reply and sorry about the delay.

No worries ;)

> ----- 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 ?

Yes this is correct what Shawn and I mean is that you should adapt the
commit title. Shawn already give you an example.

> > 
> > 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>;

As you pointed out above this device isn't available on the
imx6dl-rex-basic? You should add: 'status = "disabled";' if this is the
case.

Regards,
  Marco

> >> +	};
> >>  };
> >>  
> >>  &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
> 

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