netdev - Re: [PATCH v1 05/20] ARM: dts: imx6qdl: use enet_clk_ref instead of enet

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Date:   Mon, 16 Jan 2023 09:01:08 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Abel Vesa <abelvesa@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Richard Cochran <richardcochran@...il.com>
Cc:     kernel@...gutronix.de, Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lee Jones <lee@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v1 05/20] ARM: dts: imx6qdl: use enet_clk_ref instead of
 enet_out for the FEC node

Hi Oleksij,

On 1/13/2023 10:27 PM, Oleksij Rempel wrote:
> Old imx6q machine code makes RGMII/RMII clock direction decision based on
> configuration of "ptp" clock. "enet_out" is not used and make no real
> sense, since we can't configure it as output or use it as clock
> provider.
> 
> Instead of "enet_out" use "enet_clk_ref" which is actual selector to
> choose between internal and external clock source:
> 
> FEC MAC <---------- enet_clk_ref <--------- SoC PLL
>                           \
> 			  ^------<-> refclock PAD (bi directional)
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>   arch/arm/boot/dts/imx6qdl.dtsi | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
> index ff1e0173b39b..71522263031a 100644
> --- a/arch/arm/boot/dts/imx6qdl.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl.dtsi
> @@ -1050,8 +1050,8 @@ fec: ethernet@...8000 {
>   				clocks = <&clks IMX6QDL_CLK_ENET>,
>   					 <&clks IMX6QDL_CLK_ENET>,
>   					 <&clks IMX6QDL_CLK_ENET_REF>,
> -					 <&clks IMX6QDL_CLK_ENET_REF>;
> -				clock-names = "ipg", "ahb", "ptp", "enet_out";
> +					 <&clks IMX6QDL_CLK_ENET_REF_SEL>;
> +				clock-names = "ipg", "ahb", "ptp", "enet_clk_ref";


Please also update fec binding, otherwise there will be dtbs check error.

Thanks,
Peng.

>   				fsl,stop-mode = <&gpr 0x34 27>;
>   				status = "disabled";
>   			};