linux-kernel - Re: [PATCH 2/3] arm64: dts: imx8mq-librem5-r3: Mark buck3 as always on

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Message-ID: <20210315072429.GQ11246@dragon>
Date:   Mon, 15 Mar 2021 15:24:30 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     robh@...nel.org, kernel@...gutronix.de, festevam@...il.com,
        krzk@...nel.org, kernel@...i.sm, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org,
        Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
Subject: Re: [PATCH 2/3] arm64: dts: imx8mq-librem5-r3: Mark buck3 as always
 on

On Thu, Mar 11, 2021 at 01:02:58PM +0100, Martin Kepplinger wrote:
> From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
> 
> Commit 66d3f246d79f ("arm64: dts: librem5: Don't mark buck3 as always on")

I cannot find this commit.

Shawn

> removed always-on marking from GPU regulator, which is great for power
> saving - however it introduces additional i2c0 traffic which can be deadly
> for devices from the Dogwood batch.
> 
> To workaround the i2c0 shutdown issue on Dogwood, this commit marks
> buck3 as always-on again - but only for Dogwood (r3).
> 
> Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
> ---
>  arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
> index 0d38327043f8..cd3c3edd48fa 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
> @@ -28,6 +28,10 @@ &bq25895 {
>  	ti,termination-current = <144000>;  /* uA */
>  };
>  
> +&buck3_reg {
> +	regulator-always-on;
> +};
> +
>  &proximity {
>  	proximity-near-level = <25>;
>  };
> -- 
> 2.30.1
>