[U-Boot] [PATCH V2 02/10] imx8: scu: use dedicated MU for SPL

[Peng Fan]

SPL runs in EL3 mode, except MU0_A, others are not powered on,
and could not be used. However normal U-Boot use MU1_A, so we
could not reuse the one in dts. And we could not replace the one
in dts with MU0_A, because MU0_A is reserved in secure world.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/imx8/Kconfig | 7 +++++++
 drivers/misc/imx8/scu.c        | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm/mach-imx/imx8/Kconfig b/arch/arm/mach-imx/imx8/Kconfig
index 9671107cb6..f76a139684 100644
--- a/arch/arm/mach-imx/imx8/Kconfig
+++ b/arch/arm/mach-imx/imx8/Kconfig
@@ -3,6 +3,13 @@ if ARCH_IMX8
 config IMX8
 	bool
 
+config MU_BASE_SPL
+	hex "MU base address used in SPL"
+	default 0x5d1b0000
+	help
+	  SPL runs in EL3 mode, it use MU0_A to communicate with SCU.
+	  So we could not reuse the one in dts which is for normal U-Boot.
+
 config IMX8QXP
 	select IMX8
 	select SUPPORT_SPL
diff --git a/drivers/misc/imx8/scu.c b/drivers/misc/imx8/scu.c
index 15101b3e5f..1b9c49c99c 100644
--- a/drivers/misc/imx8/scu.c
+++ b/drivers/misc/imx8/scu.c
@@ -191,7 +191,11 @@ static int imx8_scu_probe(struct udevice *dev)
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
+#ifdef CONFIG_SPL_BUILD
+	plat->base = (struct mu_type *)CONFIG_MU_BASE_SPL;
+#else
 	plat->base = (struct mu_type *)addr;
+#endif
 
 	/* U-Boot not enable interrupts, so need to enable RX interrupts */
 	mu_hal_init(plat->base);
-- 
2.14.1