rockchip: pinctrl: rk3368: add pinctrl for SDMMC0

Apparently, our earlier assumption that the BROM will always set up
the iomux for SDcard communication does not always hold true: when
booting U-Boot from the on-module (on the RK3368-uQ7) eMMC, the SDcard
pins are not set up and need to be configured by the pinctrl driver to
allow SD card access.

This change implements support for setting up the SDMMC pins in
pinctrl for the RK3368.

Reported-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/pinctrl/rockchip/pinctrl_rk3368.c

@@ -208,6 +208,29 @@ enum {
 	GPIO2A0_FLASH_CSN0      = (1 << GPIO2A0_SHIFT),
 };
 
+/*GRF_GPIO2B_IOMUX*/
+enum {
+	GPIO2B3_SHIFT           = 6,
+	GPIO2B3_MASK            = GENMASK(GPIO2B3_SHIFT + 1, GPIO2B3_SHIFT),
+	GPIO2B3_GPIO            = 0,
+	GPIO2B3_SDMMC0_DTECTN   = (1 << GPIO2B3_SHIFT),
+
+	GPIO2B2_SHIFT           = 4,
+	GPIO2B2_MASK            = GENMASK(GPIO2B2_SHIFT + 1, GPIO2B2_SHIFT),
+	GPIO2B2_GPIO            = 0,
+	GPIO2B2_SDMMC0_CMD      = (1 << GPIO2B2_SHIFT),
+
+	GPIO2B1_SHIFT           = 2,
+	GPIO2B1_MASK            = GENMASK(GPIO2B1_SHIFT + 1, GPIO2B1_SHIFT),
+	GPIO2B1_GPIO            = 0,
+	GPIO2B1_SDMMC0_CLKOUT   = (1 << GPIO2B1_SHIFT),
+
+	GPIO2B0_SHIFT           = 0,
+	GPIO2B0_MASK            = GENMASK(GPIO2B0_SHIFT + 1, GPIO2B0_SHIFT),
+	GPIO2B0_GPIO            = 0,
+	GPIO2B0_SDMMC0_D3       = (1 << GPIO2B0_SHIFT),
+};
+
 /*GRF_GPIO2D_IOMUX*/
 enum {
 	GPIO2D7_SHIFT           = 14,
@@ -580,11 +603,17 @@ static void pinctrl_rk3368_sdmmc_config(struct rk3368_grf *grf, int mmc_id)
 			     GPIO2A4_EMMC_CLKOUT);
 		break;
 	case PERIPH_ID_SDCARD:
-		/*
-		 * We assume that the BROM has already set this up
-		 * correctly for us and that there's nothing to do
-		 * here.
-		 */
+		debug("mmc id = %d setting registers!\n", mmc_id);
+		rk_clrsetreg(&grf->gpio2a_iomux,
+			     GPIO2A5_MASK | GPIO2A7_MASK |
+			     GPIO2A7_MASK,
+			     GPIO2A5_SDMMC0_D0 | GPIO2A6_SDMMC0_D1 |
+			     GPIO2A7_SDMMC0_D2);
+		rk_clrsetreg(&grf->gpio2b_iomux,
+			     GPIO2B0_MASK | GPIO2B1_MASK |
+			     GPIO2B2_MASK | GPIO2B3_MASK,
+			     GPIO2B0_SDMMC0_D3 | GPIO2B1_SDMMC0_CLKOUT |
+			     GPIO2B2_SDMMC0_CMD | GPIO2B3_SDMMC0_DTECTN);
 		break;
 	default:
 		debug("mmc id = %d iomux error!\n", mmc_id);