drivers: mipi_dbi: stm32: fmc: add bank address property

The driver gets FMC bank address using
`FMC_BANK1_<parent_register_value>` define.

This approach has some flaws:
- The parent (bank) register's value might not correspond
  sequentially to the expected bank number.
  For example: `STM32_FMC_NOSRAM_BANK3` maps to `FMC_BANK1_4`,
  instead of `FMC_BANK1_3`.
- Some families don't even define the necessary `FMC_BANK1_x` macros.

To address this, the commit adds an optional `bank-address` property,
providing a direct way to define the FMC bank address for the driver.

Signed-off-by: Georgij Černyšiov <[email protected]>

Author: GeorgeCGV

drivers/mipi_dbi/mipi_dbi_stm32_fmc.c

@@ -182,8 +182,9 @@ static DEVICE_API(mipi_dbi, mipi_dbi_stm32_fmc_driver_api) = {
 	.write_display = mipi_dbi_stm32_fmc_write_display,
 };
 
-#define MIPI_DBI_FMC_GET_ADDRESS(n) _CONCAT(FMC_BANK1_,                                            \
-					UTIL_INC(DT_REG_ADDR_RAW(DT_INST_PARENT(n))))
+#define MIPI_DBI_FMC_GET_ADDRESS(n)                                                                \
+	DT_INST_PROP_OR(n, bank_address,                                                           \
+			_CONCAT(FMC_BANK1_, UTIL_INC(DT_REG_ADDR_RAW(DT_INST_PARENT(n)))))
 
 #define MIPI_DBI_FMC_GET_DATA_ADDRESS(n)                                                           \
 	MIPI_DBI_FMC_GET_ADDRESS(n) + (1 << (DT_INST_PROP(n, register_select_pin) + 1))

dts/bindings/mipi-dbi/st,mipi-dbi-fmc.yaml

@@ -7,6 +7,11 @@ compatible: "st,stm32-fmc-mipi-dbi"
 include: ["mipi-dbi-controller.yaml"]
 
 properties:
+  bank-address:
+    type: int
+    description: |
+      Optional property to provide FMC Bank address.
+
   reset-gpios:
     type: phandle-array
     description: |