linux-stable/arch/arm/boot/dts/stm32mp15-scmi.dtsi

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ARM: dts: stm32: move SCMI related nodes in a dedicated file for stm32mp15 Adding a "secure" version of STM32 boards (DK1/DK2/ED1/EV1), SCMI (clock/ reset) protocol and OP-TEE node have been added in SoC dtsi file (stm32mp151.dtsi). They have been added with a status disabled in order to keep our legacy unchanged. It is actually not enough to keep our legacy unchanged. First, just a reminder about our use case: TF-A (BL2) loads and starts OP-TEE, then loads and runs U-Boot. U-Boot code checks if an OP-TEE is running, if yes it searches in Kernel device tree if an OP-TEE node is present: -If the OP-TEE node is not present then U-Boot copies OP-TEE node and its reserved memory region from U-Boot device tree to the kernel device tree. -If the OP-TEE node is present then it does nothing (this OP-TEE node will be used by Linux). So U-Boot lets the kernel device tree unchanged thinking it is correct for an OP-TEE usage. It is the case for our legacy boards, the OP-TEE node is present (although disabled) but the reserved memory region is not declared. As no memory region has been reserved for OP-TEE, the end of DDR is seen by the kernel as free and then used for CMA. But as OP-TEE is running, this end of DDR is already used by OP-TEE. So as soon as kernel tries to access to the CMA region OP-TEE raises an error. To fix it, all OP-TEE node and SCMI is moved in a dedicated file. Fixes: 40b4157dbd8c ("ARM: dts: stm32: enable optee firmware and SCMI support on STM32MP15") Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com> Link: https://lore.kernel.org/r/20220613071920.5463-1-alexandre.torgue@foss.st.com' Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2022-06-13 07:19:20 +00:00
// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Copyright (C) STMicroelectronics 2022 - All Rights Reserved
* Author: Alexandre Torgue <alexandre.torgue@foss.st.com> for STMicroelectronics.
*/
/ {
firmware {
optee: optee {
compatible = "linaro,optee-tz";
method = "smc";
};
scmi: scmi {
compatible = "linaro,scmi-optee";
#address-cells = <1>;
#size-cells = <0>;
linaro,optee-channel-id = <0>;
shmem = <&scmi_shm>;
scmi_clk: protocol@14 {
reg = <0x14>;
#clock-cells = <1>;
};
scmi_reset: protocol@16 {
reg = <0x16>;
#reset-cells = <1>;
};
};
};
soc {
scmi_sram: sram@2ffff000 {
compatible = "mmio-sram";
reg = <0x2ffff000 0x1000>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x2ffff000 0x1000>;
scmi_shm: scmi-sram@0 {
compatible = "arm,scmi-shmem";
reg = <0 0x80>;
};
};
};
};