linux-kernel - Re: [PATCH 4/5] arm64: dts: exynos: gs101: use correct clocks for usi

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Date: Sat, 27 Jan 2024 04:03:41 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: André Draszik <andre.draszik@...aro.org>,
 peter.griffin@...aro.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com,
 willmcvicker@...gle.com, semen.protsenko@...aro.org,
 alim.akhtar@...sung.com, s.nawrocki@...sung.com, tomasz.figa@...il.com,
 cw00.choi@...sung.com, mturquette@...libre.com, sboyd@...nel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: exynos: gs101: use correct clocks for
 usi_uart



On 1/27/24 00:35, André Draszik wrote:
> Wrong pclk clocks have been used in this usi8 instance here. For USI
> and UART, we need the ipclk and pclk, where pclk is the bus clock.
> Without it, nothing can work.
> It is unclear what exactly is using USI0_UART_CLK, but it is not
> required for the IP to be operational at this stage, while pclk is.
> This also brings the DT in line with the clock names expected by the
> usi and uart drivers.
> 
> Update the DTSI accordingly.
> 
> Fixes: d97b6c902a40 ("arm64: dts: exynos: gs101: update USI UART to use peric0 clocks")
> Signed-off-by: André Draszik <andre.draszik@...aro.org>
> ---
>  arch/arm64/boot/dts/exynos/google/gs101.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> index e5b665be2d62..f93e937d2726 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> @@ -410,7 +410,7 @@ usi_uart: usi@...000c0 {
>  			ranges;
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			clocks = <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI0_UART_CLK>,
> +			clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0>,

As I said in the previous email, I don't think this is correct. This is
just a heads up for Krzysztof to not pick these 2 patches yet. We'll
come back on this matter on Monday.

>  				 <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_0>;
>  			clock-names = "pclk", "ipclk";
>  			samsung,sysreg = <&sysreg_peric0 0x1020>;
> @@ -422,7 +422,7 @@ serial_0: serial@...00000 {
>  				reg = <0x10a00000 0xc0>;
>  				interrupts = <GIC_SPI 634
>  					      IRQ_TYPE_LEVEL_HIGH 0>;
> -				clocks = <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI0_UART_CLK>,
> +				clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0>,
>  					 <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_0>;
>  				clock-names = "uart", "clk_uart_baud0";
>  				samsung,uart-fifosize = <256>;