[U-Boot] [PATCH v3.1 9/9] arm: dts: sunxi: Alter mmc2 auto-numbering to mmc1

[Jagan Teki]

Environment and fastboot mmc devices are configured based on the number
of mmc slots defined on particular board configs, MMC_SUNXI_SLOT_EXTRA.

If MMC_SUNXI_SLOT_EXTRA is more than 1, the default env and fastboot
mmc devices is mmc1 by assuming mmc0 is SD and mmc1 is emmc device.

But with DM_MMC the mmc devices are numbered as per the dts node
enablement. If there is a chance of having enabling all mmc nodes
in dts say mmc0, mmc1, mmc2 then the default env and fastboot devices
will failed to assign proper emmc device since mmc2 is emmc in most
of the Allwinner platforms.

So, we need to alter the auto-numbering by aliasing mmc2 to mmc1 since
aliases take precedence over auto-numbering.

If the dts enables mmc0, mmc1, mmc2, then all the nodes will probe
sequentially and auto-numbered as it is. but when aliases mmc1 with mmc2
the resulting number should be that mmc0 is till mmc0, mmc2 become mmc1
and mmc2 become mmc1

Without aliases of mmc1 = &mmc2;
================================
MMC:   mmc at 1c0f000: 0, mmc at 1c10000: 1, mmc at 1c11000: 2

With aliases of mmc1 = &mmc2;
================================
MMC:   Device 'mmc at 1c11000': seq 1 is in use by 'mmc at 1c10000'
mmc at 1c0f000: 0, mmc at 1c10000: 2, mmc at 1c11000: 1
Loading Environment from FAT... OK

Some platforms like A20 has mmc0...mmc3, but there is no usecases now
for enabling all mmc controllers in any of A20 board dts files.

Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
Changes for v3.1:
- add proper commit message details along with example of how aliases
  alter the mmc numbering.

 arch/arm/dts/sunxi-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/sunxi-u-boot.dtsi b/arch/arm/dts/sunxi-u-boot.dtsi
index 8a9f2a6417..fdd4c80aa4 100644
--- a/arch/arm/dts/sunxi-u-boot.dtsi
+++ b/arch/arm/dts/sunxi-u-boot.dtsi
@@ -1,6 +1,10 @@
 #include <config.h>
 
 / {
+	aliases {
+		mmc1 = &mmc2;
+	};
+
 	binman {
 		filename = "u-boot-sunxi-with-spl.bin";
 		pad-byte = <0xff>;
-- 
2.18.0.321.gffc6fa0e3