ARM: dts: stm32: Use DT alias for the configuration EEPROM

Use DT /aliases node to establish a stable phandle to the configuration
EEPROM. This permits the configuration EEPROM to be moved e.g. to a
different address or a different bus. Adjust the board code to handle
new phandle lookup.

Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>

diff --git a/arch/arm/dts/stm32mp15xx-dhcom.dtsi b/arch/arm/dts/stm32mp15xx-dhcom.dtsi
index bed69c9..e5be0a7 100644 (file)
--- a/arch/arm/dts/stm32mp15xx-dhcom.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcom.dtsi
@@ -10,6 +10,10 @@
 #include <dt-bindings/mfd/st,stpmic1.h>
 
 / {
+       aliases {
+               eeprom0 = &eeprom0;
+       };
+
        memory@c0000000 {
                device_type = "memory";
                reg = <0xC0000000 0x40000000>;
@@ -187,7 +191,7 @@
                };
        };
 
-       eeprom@50 {
+       eeprom0: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
                pagesize = <16>;

diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index b663696..7bcd713 100644 (file)
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -78,22 +78,21 @@ DECLARE_GLOBAL_DATA_PTR;
 
 int setup_mac_address(void)
 {
-       struct udevice *dev;
-       ofnode eeprom;
        unsigned char enetaddr[6];
-       int ret;
+       struct udevice *dev;
+       int off, ret;
 
        ret = eth_env_get_enetaddr("ethaddr", enetaddr);
        if (ret)        /* ethaddr is already set */
                return 0;
 
-       eeprom = ofnode_path("/soc/i2c@5c002000/eeprom@50");
-       if (!ofnode_valid(eeprom)) {
-               printf("Invalid hardware path to EEPROM!\n");
-               return -ENODEV;
+       off = fdt_path_offset(gd->fdt_blob, "eeprom0");
+       if (off < 0) {
+               printf("%s: No eeprom0 path offset\n", __func__);
+               return off;
        }
 
-       ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, &dev);
+       ret = uclass_get_device_by_of_offset(UCLASS_I2C_EEPROM, off, &dev);
        if (ret) {
                printf("Cannot find EEPROM!\n");
                return ret;