rockchip: pinctrl: rk3399: add support for I2C8

The RK3399 has a total of 9 I2C controllers.  To support these, the
enum in periph.h is extended and the mapping from the IRQ numbers to
the peripheral-ids is extended to ensure that pinctrl requests are
passed through to the function configuring the I2C pins.

For I2C8, the pinctrl is implemented and tested (on a RK3399-Q7) using
communication with the FAN53555 connected on I2C8.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>

arch/arm/include/asm/arch-rockchip/grf_rk3399.h

@@ -589,7 +589,12 @@ enum {
 	PMUGRF_GPIO1C3_SEL_SHIFT        = 6,
 	PMUGRF_GPIO1C3_SEL_MASK = 3 << PMUGRF_GPIO1C3_SEL_SHIFT,
 	PMUGRF_PWM_2            = 1,
-
+	PMUGRF_GPIO1C4_SEL_SHIFT = 8,
+	PMUGRF_GPIO1C4_SEL_MASK = 3 << PMUGRF_GPIO1C4_SEL_SHIFT,
+	PMUGRF_I2C8PMU_SDA = 1,
+	PMUGRF_GPIO1C5_SEL_SHIFT = 10,
+	PMUGRF_GPIO1C5_SEL_MASK = 3 << PMUGRF_GPIO1C5_SEL_SHIFT,
+	PMUGRF_I2C8PMU_SCL = 1,
 };
 
 /* GRF_SOC_CON5 */

arch/arm/include/asm/arch-rockchip/periph.h

@@ -24,6 +24,9 @@ enum periph_id {
 	PERIPH_ID_I2C3,
 	PERIPH_ID_I2C4,
 	PERIPH_ID_I2C5,
+	PERIPH_ID_I2C6,
+	PERIPH_ID_I2C7,
+	PERIPH_ID_I2C8,
 	PERIPH_ID_SPI0,
 	PERIPH_ID_SPI1,
 	PERIPH_ID_SPI2,

drivers/pinctrl/rockchip/pinctrl_rk3399.c

@@ -70,11 +70,21 @@ static void pinctrl_rk3399_i2c_config(struct rk3399_grf_regs *grf,
 			     PMUGRF_GPIO1C0_SEL_MASK,
 			     PMUGRF_I2C0PMU_SCL << PMUGRF_GPIO1C0_SEL_SHIFT);
 		break;
+	case PERIPH_ID_I2C8:
+		rk_clrsetreg(&pmugrf->gpio1c_iomux,
+			     PMUGRF_GPIO1C4_SEL_MASK,
+			     PMUGRF_I2C8PMU_SDA << PMUGRF_GPIO1C4_SEL_SHIFT);
+		rk_clrsetreg(&pmugrf->gpio1c_iomux,
+			     PMUGRF_GPIO1C5_SEL_MASK,
+			     PMUGRF_I2C8PMU_SCL << PMUGRF_GPIO1C5_SEL_SHIFT);
+		break;
 	case PERIPH_ID_I2C1:
 	case PERIPH_ID_I2C2:
 	case PERIPH_ID_I2C3:
 	case PERIPH_ID_I2C4:
 	case PERIPH_ID_I2C5:
+	case PERIPH_ID_I2C6:
+	case PERIPH_ID_I2C7:
 	default:
 		debug("i2c id = %d iomux error!\n", i2c_id);
 		break;
@@ -301,6 +311,9 @@ static int rk3399_pinctrl_request(struct udevice *dev, int func, int flags)
 	case PERIPH_ID_I2C3:
 	case PERIPH_ID_I2C4:
 	case PERIPH_ID_I2C5:
+	case PERIPH_ID_I2C6:
+	case PERIPH_ID_I2C7:
+	case PERIPH_ID_I2C8:
 		pinctrl_rk3399_i2c_config(priv->grf, priv->pmugrf, func);
 		break;
 	case PERIPH_ID_SPI0:
@@ -375,6 +388,12 @@ static int rk3399_pinctrl_get_periph_id(struct udevice *dev,
 		return PERIPH_ID_I2C4;
 	case 38:
 		return PERIPH_ID_I2C5;
+	case 37:
+		return PERIPH_ID_I2C6;
+	case 36:
+		return PERIPH_ID_I2C7;
+	case 58:
+		return PERIPH_ID_I2C8;
 	case 65:
 		return PERIPH_ID_SDMMC1;
 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)