[PATCH] amd: versal2: detect spi env bus from boot mode

[Suraj Kakade]

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 <suraj.hanumantkakade at amd.com>
---
 board/amd/versal2/board.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/board/amd/versal2/board.c b/board/amd/versal2/board.c
index 81daba1c5ef..46918436364 100644
--- a/board/amd/versal2/board.c
+++ b/board/amd/versal2/board.c
@@ -476,3 +476,31 @@ enum env_location env_get_location(enum env_operation op, int prio)
 	}
 }
 #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 at f1030000";
+		break;
+	case OSPI_MODE:
+		name = "spi at 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;
+}
-- 
2.43.0