linux-kernel - Re: [PATCH 4/4] arm64: dts: exynos: gs101: specify placeholder clocks for remaining pinctrl

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Date: Tue, 30 Apr 2024 08:16:41 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: André Draszik <andre.draszik@...aro.org>,
 Peter Griffin <peter.griffin@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>,
 Will McVicker <willmcvicker@...gle.com>,
 Sam Protsenko <semen.protsenko@...aro.org>, kernel-team@...roid.com,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: exynos: gs101: specify placeholder clocks
 for remaining pinctrl

On 29/04/2024 22:04, André Draszik wrote:
> The pinctrl instances hsi1, gsactrl, and gsacore need a clock for
> register access to work.
> 
> Since we haven't implemented the relevant CMUs for the clocks required
> by these instances just add placeholder clocks for now so as to make the
> DT pass the validation checks.
> Once the clocks are implmented in the gs101 clock driver, these should
> be updated then.
> 
> Signed-off-by: André Draszik <andre.draszik@...aro.org>
> ---
>  arch/arm64/boot/dts/exynos/google/gs101.dtsi | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> index f8fcbbb06e7b..6db2c9bbb371 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> @@ -180,6 +180,14 @@ HERA_CPU_SLEEP: cpu-hera-sleep {
>  		};
>  	};
>  
> +	/* TODO: Remove this once all pinctrl clocks are implemented  */
> +	clk_placeholder: clock-placeholder {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <0>;
> +		clock-output-names = "placeholder_clk";
> +	};
> +
>  	/* ect node is required to be present by bootloader */
>  	ect {
>  	};
> @@ -1309,6 +1317,9 @@ usbdrd31_dwc3: usb@0 {
>  		pinctrl_hsi1: pinctrl@...40000 {
>  			compatible = "google,gs101-pinctrl";
>  			reg = <0x11840000 0x00001000>;
> +			/* TODO: update once support for this CMU exists */
> +			clocks = <&clk_placeholder>;

<0> does not work for you?

Best regards,
Krzysztof