linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j721s2: Change CPTS clock parent

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Message-ID: <20230605114924.56ccpd6rvddnr463@undying>
Date:   Mon, 5 Jun 2023 06:49:24 -0500
From:   Nishanth Menon <nm@...com>
To:     Neha Malcom Francis <n-francis@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vigneshr@...com>, <kristo@...nel.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-j721s2: Change CPTS clock parent

On 16:34-20230605, Neha Malcom Francis wrote:
> MAIN_PLL0 has a flag set in DM (Device Manager) that removes it's
> capability to re-initialise clock frequencies. CPTS and RGMII has
> MAIN_PLL3 as their parent which does not have this flag. While RGMII
> needs this reinitialisation to default frequency to be able to get
> 250MHz with its divider, CPTS can not get its required 200MHz with its
> divider. Thus, move CPTS clock parent on J721S2 from MAIN_PLL3_HSDIV1 to
> MAIN_PLL0_HSDIV6.
> 
> (Note: even GTC will be moved from MAIN_PLL3 to MAIN_PLL0 in U-Boot side
> for the same reason)
> 
> Signed-off-by: Neha Malcom Francis <n-francis@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi       | 2 ++
>  arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi | 2 ++


Is this the only device with this change? or are we doing that across
the board? if so, could you please do this in a single series so that we
don't have a mix?

>  2 files changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> index 2dd7865f7654..331e0c9b4db8 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> @@ -738,6 +738,8 @@ cpts@...d0000 {
>  			reg-names = "cpts";
>  			clocks = <&k3_clks 226 5>;
>  			clock-names = "cpts";
> +			assigned-clocks = <&k3_clks 226 5>; /* NAVSS0_CPTS_0_RCLK */
> +			assigned-clock-parents = <&k3_clks 226 7>; /* MAIN_0_HSDIVOUT6_CLK */
>  			interrupts-extended = <&main_navss_intr 391>;
>  			interrupt-names = "cpts";
>  			ti,cpts-periodic-outputs = <6>;
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> index a353705a7463..b55a3e9daf85 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> @@ -333,6 +333,8 @@ cpts@...00 {
>  			reg = <0x0 0x3d000 0x0 0x400>;
>  			clocks = <&k3_clks 29 3>;
>  			clock-names = "cpts";
> +			assigned-clocks = <&k3_clks 29 3>; /* CPTS_RFT_CLK */
> +			assigned-clock-parents = <&k3_clks 29 5>; /* MAIN_0_HSDIVOUT6_CLK */
>  			interrupts-extended = <&gic500 GIC_SPI 858 IRQ_TYPE_LEVEL_HIGH>;
>  			interrupt-names = "cpts";
>  			ti,cpts-ext-ts-inputs = <4>;
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D