linux-kernel - Re: [PATCH] arm64: dts: fsl: librem5: Limit the USB to 5V

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Date:   Mon, 24 Jun 2019 10:08:15 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     "Angus Ainslie (Purism)" <angus@...ea.ca>
Cc:     angus.ainslie@...i.sm, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pavel Machek <pavel@....cz>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: fsl: librem5: Limit the USB to 5V

On Thu, Jun 20, 2019 at 11:04:39AM -0600, Angus Ainslie (Purism) wrote:
> The charge controller can handle 14V but the PTC on the devkit can only
> handle 6V so limit the negotiated voltage to 5V.
> 
> Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>

Prefix 'arm64: dts: librem5: ...' should be fine, so I changed it and
applied the patch.

Shawn

> ---
>  arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> index 3f4736fd3cea..ec85ada77955 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> @@ -353,7 +353,7 @@
>  			sink-pdos = <PDO_FIXED(5000, 2000, PDO_FIXED_USB_COMM |
>  				PDO_FIXED_DUAL_ROLE |
>  				PDO_FIXED_DATA_SWAP )
> -			     PDO_VAR(5000, 12000, 2000)>;
> +			     PDO_VAR(5000, 3000, 3000)>;
>  			op-sink-microwatt = <10000000>;
>  
>  			ports {
> -- 
> 2.17.1
>