ARM: stm32: Implement DDR3 coding on DHCOR SoM
The DHCOR board does exist in multiple variants with different DDR3
DRAM sizes. To cater for all of them, implement DDR3 code handling.
There are two GPIOs which code the DRAM size populated on the SoM,
read them out and use the value to pick the correct DDR3 config.
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/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index 5193868..9a2926b 100644
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -135,6 +135,7 @@
#ifdef CONFIG_BOARD_EARLY_INIT_F
static u8 brdcode __section("data");
+static u8 ddr3code __section("data");
static u8 somcode __section("data");
static void board_get_coding_straps(void)
@@ -150,6 +151,7 @@
}
brdcode = 0;
+ ddr3code = 0;
somcode = 0;
ret = gpio_request_list_by_name_nodev(node, "dh,som-coding-gpios",
@@ -158,13 +160,34 @@
for (i = 0; i < ret; i++)
somcode |= !!dm_gpio_get_value(&(gpio[i])) << i;
+ ret = gpio_request_list_by_name_nodev(node, "dh,ddr3-coding-gpios",
+ gpio, ARRAY_SIZE(gpio),
+ GPIOD_IS_IN);
+ for (i = 0; i < ret; i++)
+ ddr3code |= !!dm_gpio_get_value(&(gpio[i])) << i;
+
ret = gpio_request_list_by_name_nodev(node, "dh,board-coding-gpios",
gpio, ARRAY_SIZE(gpio),
GPIOD_IS_IN);
for (i = 0; i < ret; i++)
brdcode |= !!dm_gpio_get_value(&(gpio[i])) << i;
- printf("Code: SoM:rev=%d Board:rev=%d\n", somcode, brdcode);
+ printf("Code: SoM:rev=%d,ddr3=%d Board:rev=%d\n",
+ somcode, ddr3code, brdcode);
+}
+
+int board_stm32mp1_ddr_config_name_match(struct udevice *dev,
+ const char *name)
+{
+ if (ddr3code == 2 &&
+ !strcmp(name, "st,ddr3-1066-888-bin-g-1x4gb-533mhz"))
+ return 0;
+
+ if (ddr3code == 3 &&
+ !strcmp(name, "st,ddr3-1066-888-bin-g-2x4gb-533mhz"))
+ return 0;
+
+ return -EINVAL;
}
int board_early_init_f(void)
@@ -537,6 +560,7 @@
#ifdef CONFIG_BOARD_EARLY_INIT_F
env_set_ulong("dh_som_rev", somcode);
env_set_ulong("dh_board_rev", brdcode);
+ env_set_ulong("dh_ddr3_code", ddr3code);
#endif
return 0;