spl: mmc: Rename spl_boot_partition() to spl_mmc_boot_partition()

This function is only relevant to the MMC driver so calling it
spl_boot_partition() might be confusing.  Rename it to
spl_mmc_boot_partition() to make its purpose more clear (and bring
it in line with spl_mmc_boot_mode()).

Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-stm32mp/spl.c b/arch/arm/mach-stm32mp/spl.c
index 55ff97d..f85391c 100644
--- a/arch/arm/mach-stm32mp/spl.c
+++ b/arch/arm/mach-stm32mp/spl.c
@@ -49,7 +49,7 @@
 	return MMCSD_MODE_RAW;
 }
 
-int spl_boot_partition(const u32 boot_device)
+int spl_mmc_boot_partition(const u32 boot_device)
 {
 	switch (boot_device) {
 	case BOOT_DEVICE_MMC1:
diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index fb8ad5d..a68cdec 100644
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -310,8 +310,7 @@
 }
 
 #ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
-__weak
-int spl_boot_partition(const u32 boot_device)
+int __weak spl_mmc_boot_partition(const u32 boot_device)
 {
 	return CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION;
 }
@@ -431,7 +430,7 @@
 			    NULL,
 #endif
 #ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
-			    spl_boot_partition(bootdev->boot_device),
+			    spl_mmc_boot_partition(bootdev->boot_device),
 #else
 			    0,
 #endif
diff --git a/include/spl.h b/include/spl.h
index fffcc61..8b15cd4 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -255,7 +255,19 @@
  * spl_boot_device() as U-Boot is not always loaded from the same device as SPL.
  */
 u32 spl_mmc_boot_mode(const u32 boot_device);
-int spl_boot_partition(const u32 boot_device);
+
+/**
+ * spl_mmc_boot_partition() - MMC partition to load U-Boot from.
+ * @boot_device:	ID of the device which the MMC driver wants to load
+ *			U-Boot from.
+ *
+ * This function should return the partition number which the SPL
+ * should load U-Boot from (on the given boot_device) when
+ * CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION is set.
+ *
+ * If not overridden, it is weakly defined in common/spl/spl_mmc.c.
+ */
+int spl_mmc_boot_partition(const u32 boot_device);
 void spl_set_bd(void);
 
 /**