amd: versal2: detect spi env bus from boot mode

Add spi_get_env_dev() to dynamically detect the correct SPI
bus based on the actual boot mode at runtime. This ensures
environment variables are always loaded from the correct SPI
flash controller regardless of the bus numbering.

For example, on some Versal Gen 2 boards, SPI is disabled in DTS
leaving bus 0 empty in DM. Only QSPI is enabled at bus 1. The
default CONFIG_ENV_SPI_BUS=0 causes U-Boot to search for environment
at bus 0 which does not exist, triggering the warning
"spi_flash_probe_bus_cs() failed, using default environment".

Signed-off-by: Suraj Kakade <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

1 files changed, 28 insertions, 0 deletions

diff --git a/board/amd/versal2/board.c b/board/amd/versal2/board.c
index ec28e60c410..6e4f0c6e9b8 100644
--- a/board/amd/versal2/board.c
+++ b/board/amd/versal2/board.c
@@ -605,3 +605,31 @@ void set_dfu_alt_info(char *interface, char *devstr)
 	env_set("dfu_alt_info", buf);
 }
 #endif
+
+int spi_get_env_dev(void)
+{
+	struct udevice *dev;
+	const char *name;
+	int bootseq;
+
+	switch (versal2_get_bootmode()) {
+	case QSPI_MODE_24BIT:
+	case QSPI_MODE_32BIT:
+		name = "spi@f1030000";
+		break;
+	case OSPI_MODE:
+		name = "spi@f1010000";
+		break;
+	default:
+		return -1;
+	}
+
+	if (uclass_get_device_by_name(UCLASS_SPI, name, &dev)) {
+		debug("SPI driver for %s is not present\n", name);
+		return -1;
+	}
+
+	bootseq = dev_seq(dev);
+	debug("bootseq %d\n", bootseq);
+	return bootseq;
+}