linux-kernel - Re: [linux-next-v2 2/5] arm64: dts: rockchip: Add support of external clock to ethernet node on Rock 3A SBC

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Date:   Tue, 22 Nov 2022 12:18:35 +0100
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Anand Moon <linux.amoon@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Chukun Pan <amadeus@....edu.cn>, Peter Geis <pgwipeout@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-next-v2 2/5] arm64: dts: rockchip: Add support of external
 clock to ethernet node on Rock 3A SBC

Hi Anand,

On 11/16/22 21:01, Anand Moon wrote:
> Add support of external clock gmac1_clkin which is used as input clock
> to ethernet node.

Indeed this operating mode is defined in the schematics, thanks for the fix.

> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>

Reviewed-by: Michael Riesch <michael.riesch@...fvision.net>
Tested-by: Michael Riesch <michael.riesch@...fvision.net>

Best regards,
Michael

> ---
> V2: None
> ---
>  arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> index e1c75532dcee..b848282ea005 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> @@ -32,6 +32,13 @@ hdmi_con_in: endpoint {
>  		};
>  	};
>  
> +	gmac1_clkin: external-gmac1-clock {
> +		compatible = "fixed-clock";
> +		clock-frequency = <125000000>;
> +		clock-output-names = "gmac1_clkin";
> +		#clock-cells = <0>;
> +	};
> +
>  	leds {
>  		compatible = "gpio-leds";
>  
> @@ -249,9 +256,8 @@ &cpu3 {
>  
>  &gmac1 {
>  	assigned-clocks = <&cru SCLK_GMAC1_RX_TX>, <&cru SCLK_GMAC1>;
> -	assigned-clock-parents = <&cru SCLK_GMAC1_RGMII_SPEED>;
> -	assigned-clock-rates = <0>, <125000000>;
> -	clock_in_out = "output";
> +	assigned-clock-parents = <&cru SCLK_GMAC1_RGMII_SPEED>, <&gmac1_clkin>;
> +	clock_in_out = "input";
>  	phy-handle = <&rgmii_phy1>;
>  	phy-mode = "rgmii";
>  	pinctrl-names = "default";
> @@ -259,6 +265,7 @@ &gmac1 {
>  		     &gmac1m1_tx_bus2
>  		     &gmac1m1_rx_bus2
>  		     &gmac1m1_rgmii_clk
> +		     &gmac1m1_clkinout
>  		     &gmac1m1_rgmii_bus>;
>  
>  	tx_delay = <0x4f>;