pocketbook: Configure for bus-width 4 on MMC2

arch/arm/mach-sunxi/Kconfig

@@ -582,6 +582,10 @@ config MACPWR
 	  Set the pin used to power the MAC. This takes a string in the format
 	  understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H.
 
+config MMC2_BUS_WIDTH
+	int "Bus width for mmc2 (4 or 8)"
+	default 8
+
 config MMC0_CD_PIN
 	string "Card detect pin for mmc0"
 	default "PF6" if MACH_SUN8I_A83T || MACH_SUNXI_H3_H5 || MACH_SUN50I

board/sunxi/board.c

@@ -467,8 +467,13 @@ static void mmc_pinmux_setup(int sdc)
 				sunxi_gpio_set_drv(pin, 2);
 			}
 		} else {
+#if CONFIG_MMC2_BUS_WIDTH == 4
+			/* SDC2: PC6-PC15 */
+			for (pin = SUNXI_GPC(6); pin <= SUNXI_GPC(11); pin++) {
+#else
 			/* SDC2: PC6-PC15 */
 			for (pin = SUNXI_GPC(6); pin <= SUNXI_GPC(15); pin++) {
+#endif
 				sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SDC2);
 				sunxi_gpio_set_pull(pin, SUNXI_GPIO_PULL_UP);
 				sunxi_gpio_set_drv(pin, 2);

configs/pocketbook_touch_lux_3_defconfig

@@ -8,6 +8,7 @@ CONFIG_DRAM_EMR1=0
 CONFIG_MMC0_CD_PIN="PG0"
 CONFIG_CONS_INDEX=2
 CONFIG_MMC_SUNXI_SLOT_EXTRA=2
+CONFIG_MMC2_BUS_WIDTH=4
 CONFIG_AXP_GPIO=y
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_DEFAULT_DEVICE_TREE="sun5i-a13-pocketbook-touch-lux-3"