linux-kernel - [PATCH v2 1/6] arm64: tegra: Configure QSPI clocks and add DMA

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Message-ID: <20250212144651.2433086-2-va@nvidia.com>
Date: Wed, 12 Feb 2025 14:46:46 +0000
From: Vishwaroop A <va@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.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>
CC: <va@...dia.com>
Subject: [PATCH v2 1/6] arm64: tegra: Configure QSPI clocks and add DMA

Set QSPI0_2X_PM to 199.99 MHz and QSPI0_PM to 99.99 MHz using
PLLC as the parent clock. These frequencies allow Quad IO DT
reads up to 99.99 MHz, which is the fastest that can be
achieved considering various PLL and clock divider constraints.

Populate the DMA and IOMMU properties for the Tegra234 QSPI devices to
enable DMA support.

Signed-off-by: Vishwaroop A <va@...dia.com>
---
 arch/arm64/boot/dts/nvidia/tegra234.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
index 2601b43b2d8c..0ac2d3aba930 100644
--- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
@@ -2948,6 +2948,13 @@
 				 <&bpmp TEGRA234_CLK_QSPI0_PM>;
 			clock-names = "qspi", "qspi_out";
 			resets = <&bpmp TEGRA234_RESET_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>;
+			dma-names = "rx", "tx";
+			dma-coherent;
+			iommus = <&smmu_niso1 TEGRA234_SID_QSPI0>;
 			status = "disabled";
 		};
 
@@ -3031,6 +3038,13 @@
 				 <&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>;
+			dma-names = "rx", "tx";
+			dma-coherent;
+			iommus = <&smmu_niso1 TEGRA234_SID_QSPI1>;
 			status = "disabled";
 		};
 
-- 
2.17.1