stm32mp: add syscon for STGEN

Add STGEN as SYSCON device: allow access to device address
defined in device tree

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/arch/arm/dts/stm32mp157-u-boot.dtsi b/arch/arm/dts/stm32mp157-u-boot.dtsi
index d374b2bc0883a0f9b84f0ba78e519e2a5a2663b6..7a9a4ce73cf5d9be38800de129497f750d5b7b4e 100644 (file)
--- a/arch/arm/dts/stm32mp157-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp157-u-boot.dtsi
@@ -31,6 +31,13 @@
        soc {
                u-boot,dm-pre-reloc;
        };
+
+       stgen: stgen@5C008000 {
+               compatible = "st,stm32-stgen";
+               reg = <0x5C008000 0x1000>;
+               status = "okay";
+               u-boot,dm-pre-reloc;
+       };
 };
 
 &clk_hsi {

diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile
index 4620869b36db3cc2cc11089c63039709936abad2..a495c53be8ca0c60b9a3cd7ff0ce7eefcce11f41 100644 (file)
--- a/arch/arm/mach-stm32mp/Makefile
+++ b/arch/arm/mach-stm32mp/Makefile
@@ -6,5 +6,6 @@
 
 obj-y += cpu.o
 obj-y += dram_init.o
+obj-y += syscon.o
 
 obj-$(CONFIG_SPL_BUILD) += spl.o

diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h
index 40faeb0814133d06d0549f4104d1265507829174..c7a27894c451a72846f422ffae003e4291df6196 100644 (file)
--- a/arch/arm/mach-stm32mp/include/mach/stm32.h
+++ b/arch/arm/mach-stm32mp/include/mach/stm32.h
@@ -25,6 +25,11 @@
 #define STM32_DDR_SIZE                 SZ_1G
 
 #ifndef __ASSEMBLY__
+/* enumerated used to identify the SYSCON driver instance */
+enum {
+       STM32MP_SYSCON_UNKNOWN,
+       STM32MP_SYSCON_STGEN,
+};
 
 /*
  * enumerated for boot interface from Bootrom, used in TAMP_BOOT_CONTEXT

diff --git a/arch/arm/mach-stm32mp/syscon.c b/arch/arm/mach-stm32mp/syscon.c
new file mode 100644 (file)
index 0000000..5641745
--- /dev/null
+++ b/arch/arm/mach-stm32mp/syscon.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:    GPL-2.0+        BSD-3-Clause
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <syscon.h>
+#include <asm/arch/stm32.h>
+
+static const struct udevice_id stm32mp_syscon_ids[] = {
+       { .compatible = "st,stm32-stgen",
+         .data = STM32MP_SYSCON_STGEN },
+       { }
+};
+
+U_BOOT_DRIVER(syscon_stm32mp) = {
+       .name = "stmp32mp_syscon",
+       .id = UCLASS_SYSCON,
+       .of_match = stm32mp_syscon_ids,
+       .bind = dm_scan_fdt_dev,
+};