[PATCH] ARM: boards: colibri-imx6: make BBU setting independent of DT alias

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Different baseboards may shuffle around the eMMC/SD aliases differently
and thus the barebox update handler registration may not be correct
across all of them.

Instead of hardcoding the eMMC device and SD device, let's derive the
correct index dynamically at runtime using the mapping that the barebox
bootsource code is already using.

Reported-by: Jonas Rebmann <jre@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
Jonas, can you give this a test and see if it works for you?
---
 arch/arm/boards/toradex-colibri-imx6/board.c | 24 +++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boards/toradex-colibri-imx6/board.c b/arch/arm/boards/toradex-colibri-imx6/board.c
index f3a6173e5064..5771b08cbacb 100644
--- a/arch/arm/boards/toradex-colibri-imx6/board.c
+++ b/arch/arm/boards/toradex-colibri-imx6/board.c
@@ -9,6 +9,14 @@
 #include <mach/imx/imx6.h>
 #include <mfd/imx6q-iomuxc-gpr.h>
 
+/*
+ * The upstream device tree shuffles around the eMMC/SD indices, so the
+ * board code here takes care to use the numbering of the SoC reference
+ * manual
+ */
+#define COLIBRI_MMC_INSTANCE_SD		0
+#define COLIBRI_MMC_INSTANCE_EMMC	2
+
 static void eth_init(void)
 {
 	void __iomem *iomux = IOMEM(MX6_IOMUXC_BASE_ADDR);
@@ -22,9 +30,19 @@ static void eth_init(void)
 
 static int colibri_imx6_probe(struct device *dev)
 {
-	imx6_bbu_internal_mmcboot_register_handler("emmc", "/dev/mmc0",
-			BBU_HANDLER_FLAG_DEFAULT);
-	imx6_bbu_internal_mmc_register_handler("sd", "/dev/mmc1", 0);
+	int emmc_alias, sd_alias;
+
+	emmc_alias = bootsource_of_alias_xlate(BOOTSOURCE_MMC, COLIBRI_MMC_INSTANCE_EMMC);
+	if (emmc_alias >= 0)
+		imx6_bbu_internal_mmcboot_register_handler("emmc",
+							   basprintf("/dev/mmc%u", emmc_alias),
+							   BBU_HANDLER_FLAG_DEFAULT);
+
+	sd_alias = bootsource_of_alias_xlate(BOOTSOURCE_MMC, COLIBRI_MMC_INSTANCE_SD);
+	if (sd_alias >= 0)
+		imx6_bbu_internal_mmc_register_handler("sd",
+						       basprintf("/dev/mmc%u", sd_alias),
+						       0);
 
 	barebox_set_hostname("colibri-imx6");
 
-- 
2.39.5