linux-kernel - Re: [PATCH v3 3/3] ARM: dts: imx: add devicetree for Kobo Clara HD

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Date:   Fri, 25 Oct 2019 20:07:43 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        manivannan.sadhasivam@...aro.org, andrew.smirnov@...il.com,
        marex@...x.de, angus@...ea.ca, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        j.neuschaefer@....net,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Marco Felsch <m.felsch@...gutronix.de>
Subject: Re: [PATCH v3 3/3] ARM: dts: imx: add devicetree for Kobo Clara HD

Hi,

On Fri, 25 Oct 2019 21:46:24 +0800
Shawn Guo <shawnguo@...nel.org> wrote:

[...]
> > +
> > +		pinctrl_wifi_reset: wifi_reset_grp {
> > +			fsl,pins = <
> > +				MX6SLL_PAD_SD2_DATA7__GPIO5_IO00	0x10059		/* WIFI_RST */
> > +			>;
> > +		};
> > +
> > +		pinctrl_wifi_power: wifi_power_grp {  
> 
> I guess you can have one pinctrl node to include both reset and power
> pins?  Also, to be consistent with other pinctrl nodes on naming, the
> node name should probably be wifigrp.
> 
well, the problems they are used in different nodes, so I cannot do
that:

       reg_wifi: regulator-wifi {
                compatible = "regulator-fixed";
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_wifi_power>;
                regulator-name = "SD3_SPWR";
                regulator-min-microvolt = <3000000>;
                regulator-max-microvolt = <3000000>;
                gpio = <&gpio4 29 GPIO_ACTIVE_HIGH>;
                enable-active-high;
        };

        wifi_pwrseq: wifi_pwrseq {
                compatible = "mmc-pwrseq-simple";
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_wifi_reset>;
                post-power-on-delay-ms = <20>;
                reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
        };

So having them combined breaks the mux where you use it rule.
I got in earlier mails:

> > +	wifi_pwrseq: wifi_pwrseq {
> > +		compatible = "mmc-pwrseq-simple";
> > +		post-power-on-delay-ms = <20>;
> > +		reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;  

> Can you add a pinctrl-entry here please? The general rule is to mux
> things where you use it
[...]
> > +			compatible = "regulator-fixed";
> > +			regulator-name = "SD3_SPWR";
> > +			regulator-min-microvolt = <3000000>;
> > +			regulator-max-microvolt = <3000000>;
> > +
> > +			gpio = <&gpio4 29 GPIO_ACTIVE_HIGH>;  

> Please add a pinctrl here to mux this gpio.

Regards,
Andreas