linux-kernel - Re: [PATCH v3 4/6] arm64: tegra: Configure QSPI clocks and add DMA

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Message-ID: <a71d147c-ea95-41e6-b631-f889a18888d4@nvidia.com>
Date: Wed, 16 Apr 2025 15:11:27 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Vishwaroop A <va@...dia.com>, thierry.reding@...il.com,
 skomatineni@...dia.com, ldewangan@...dia.com, broonie@...nel.org,
 linux-spi@...r.kernel.org, linux-tegra@...r.kernel.org,
 linux-kernel@...r.kernel.org, kyarlagadda@...dia.com, smangipudi@...dia.com
Subject: Re: [PATCH v3 4/6] arm64: tegra: Configure QSPI clocks and add DMA


On 16/04/2025 12:06, Vishwaroop A wrote:
> For Tegra234 devices, set QSPI0_2X_PM to 199.99 MHz and QSPI0_PM to
> 99.99 MHz using PLLC as the parent clock. These frequencies enable
> Quad IO reads at up to 99.99 MHz, the maximum achievable given PLL
> and clock divider limitations.

No mention of adding the iommus property here.

> Signed-off-by: Vishwaroop A <va@...dia.com>
> ---
>   arch/arm64/boot/dts/nvidia/tegra234.dtsi | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> index 2601b43b2d8c..419dde2bfdf9 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> @@ -2948,6 +2948,11 @@
>   				 <&bpmp TEGRA234_CLK_QSPI0_PM>;
>   			clock-names = "qspi", "qspi_out";
>   			resets = <&bpmp TEGRA234_RESET_QSPI0>;
> +			iommus = <&smmu_niso1 TEGRA234_SID_QSPI0>;
> +			assigned-clocks = <&bpmp TEGRA234_CLK_QSPI0_2X_PM>,
> +					  <&bpmp TEGRA234_CLK_QSPI0_PM>;
> +			assigned-clock-rates = <199999999 99999999>;
> +			assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLC>;
>   			status = "disabled";
>   		};
>   
> @@ -3031,6 +3036,11 @@
>   				 <&bpmp TEGRA234_CLK_QSPI1_PM>;
>   			clock-names = "qspi", "qspi_out";
>   			resets = <&bpmp TEGRA234_RESET_QSPI1>;
> +			assigned-clocks = <&bpmp TEGRA234_CLK_QSPI1_2X_PM>,
> +					  <&bpmp TEGRA234_CLK_QSPI1_PM>;
> +			assigned-clock-rates = <199999999 99999999>;
> +			assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLC>;
> +			iommus = <&smmu_niso1 TEGRA234_SID_QSPI1>;

Please be consistent with the ordering of properties.

>   			status = "disabled";
>   		};
>   

-- 
nvpublic