linux-kernel - [PATCH RESEND 2/3] arm64: tegra: Configure QSPI clocks and add DMA

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Message-ID: <20250506152350.3370291-2-va@nvidia.com>
Date: Tue, 6 May 2025 15:23:49 +0000
From: Vishwaroop A <va@...dia.com>
To: <broonie@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <thierry.reding@...il.com>, <jonathanh@...dia.com>,
	<skomatineni@...dia.com>, <ldewangan@...dia.com>, <kyarlagadda@...dia.com>,
	<smangipudi@...dia.com>, <linux-spi@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <va@...dia.com>
Subject: [PATCH RESEND 2/3] arm64: tegra: Configure QSPI clocks and add DMA

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. Introduce IOMMU property which is
needed for internal dma transfers.

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..12fc850f9f5c 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>;
+			iommus = <&smmu_niso1 TEGRA234_SID_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>;
 			status = "disabled";
 		};
 
-- 
2.17.1