[PATCH] sunxi: R528: add SMHC2 pin pull ups support

[Okhunjon Sobirjonov <okhunjon72@gmail.com>]

Added support for on-chip EMMC(SMHC2) pin pull ups
for sunxi R528 board. Otherwise, "No pinmux setup
defined for MMC2" appears. Moreover, adding
CONFIG_MMC_SUNXI_SLOT_EXTRA=2 to defconfig might be
needed in order to inform SPL code that another MMC instance on
top of the default 0 for booting should be considered.

Signed-off-by: Okhunjon Sobirjonov <Okhunjon.Sobirjonov@Mec-electronics.com>
---
 board/sunxi/board.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index f321cd58a6..764a1ea998 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -482,6 +482,13 @@ static void mmc_pinmux_setup(int sdc)
 			sunxi_gpio_set_pull(pin, SUNXI_GPIO_PULL_UP);
 			sunxi_gpio_set_drv(pin, 2);
 		}
+#elif defined(CONFIG_MACH_SUN8I_R528)
+                /* SDC2: PC2-PC7 */
+                for (pin = SUNXI_GPC(2); pin <= SUNXI_GPC(7); pin++) {
+                        sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SDC2);
+                        sunxi_gpio_set_pull(pin, SUNXI_GPIO_PULL_UP);
+                        sunxi_gpio_set_drv(pin, 2);
+                }
 #else
 		puts("ERROR: No pinmux setup defined for MMC2!\n");
 #endif
-- 
2.34.1