linux-kernel - Re: [PATCH v3 2/5] ARM: dts: aspeed: ast2600evb: Add comment for gpio regulator of sdhci

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Message-Id: <8611c4a7-8c65-4d7d-90d5-37c80faa3142@www.fastmail.com>
Date:   Fri, 07 May 2021 11:10:28 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Steven Lee" <steven_lee@...eedtech.com>,
        "Ulf Hansson" <ulf.hansson@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....id.au>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        "Ryan Chen" <ryanchen.aspeed@...il.com>,
        "moderated list:ASPEED SD/MMC DRIVER" <linux-aspeed@...ts.ozlabs.org>,
        "moderated list:ASPEED SD/MMC DRIVER" <openbmc@...ts.ozlabs.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list" <linux-kernel@...r.kernel.org>
Cc:     "Ryan Chen" <ryan_chen@...eedtech.com>,
        "Chin-Ting Kuo" <chin-ting_kuo@...eedtech.com>,
        "Hongwei Zhang" <Hongweiz@....com>
Subject: Re: [PATCH v3 2/5] ARM: dts: aspeed: ast2600evb: Add comment for gpio regulator of sdhci



On Thu, 6 May 2021, at 19:33, Steven Lee wrote:
> Add the description for describing the AST2600-A2 EVB reference design of
> GPIO regulators.
> 
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> ---
>  arch/arm/boot/dts/aspeed-ast2600-evb.dts | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/aspeed-ast2600-evb.dts 
> b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> index 2772796e215e..1ae0facc3d5f 100644
> --- a/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> +++ b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> @@ -104,6 +104,21 @@
>  	status = "okay";
>  };
>  
> +/*
> + * The signal voltage of sdhci0 and sdhci1 on AST2600-A2 EVB is able to be
> + * toggled by GPIO pins.
> + * In the reference design, GPIOV0 of AST2600-A2 EVB is connected to the
> + * power load switch that providing 3.3v to sdhci0 vdd, GPIOV1 is connected to
> + * a 1.8v and a 3.3v power load switch that providing signal voltage to
> + * sdhci0 bus.
> + * If GPIOV0 is active high, sdhci0 is enabled, otherwise, sdhci0 is disabled.
> + * If GPIOV1 is active high, 3.3v power load switch is enabled, sdhci0 signal
> + * voltage is 3.3v, otherwise, 1.8v power load switch will be enabled,
> + * sdhci0 signal voltage becomes 1.8v.
> + * AST2600-A2 EVB also support toggling signal voltage for sdhci1.
> + * The design is the same as sdhci0, it uses GPIOV2 as power-gpio and GPIOV3
> + * as power-switch-gpio.
> + */

Okay, I think the comment is in the right place, but I feel this patch 
should also add the regulator nodes and hook them up to the SDHCIs.

Given Rob isn't super keen on a second example in the binding document 
I think you can just cut the example out and paste it in here.

Andrew