spi: Add support for H6

As Icenowy rightfully assumed, the V831 SPI support covers the H6 as
well. The only difference was a slight deviation in the pinmux setup:
the H6 has the SPI0-CS on pin PC5, the V831 on pin PC1.

Just add the right SoC ID and tweak the pinmux setup to enable it.

Tested on a Pine H64.
Signed-off-by: Andre Przywara <osp@andrep.de>

fel-spiflash.c

@@ -123,6 +123,7 @@ static uint32_t gpio_base(feldev_handle *dev)
 	soc_info_t *soc_info = dev->soc_info;
 	switch (soc_info->soc_id) {
 	case 0x1817: /* V831 */
+	case 0x1728: /* H6 */
 		return 0x0300B000;
 	default:
 		return 0x01C20800;
@@ -139,6 +140,7 @@ static uint32_t spi_base(feldev_handle *dev)
 	case 0x1701: /* R40 */
 		return 0x01C05000;
 	case 0x1817: /* V831 */
+	case 0x1728: /* H6 */
 		return 0x05010000;
 	default:
 		return 0x01C68000;
@@ -178,6 +180,7 @@ static bool soc_is_h6_style(feldev_handle *dev)
 	soc_info_t *soc_info = dev->soc_info;
 	switch (soc_info->soc_id) {
 	case 0x1817: /* V831 */
+	case 0x1728: /* H6 */
 		return true;
 	default:
 		return false;
@@ -223,10 +226,14 @@ static bool spi0_init(feldev_handle *dev)
 		gpio_set_cfgpin(dev, PC, 3, SUN50I_GPC_SPI0);
 		break;
 	case 0x1817: /* Allwinner V831 */
+		gpio_set_cfgpin(dev, PC, 1, SUN50I_GPC_SPI0);	/* SPI0-CS */
+		/* fall-through */
+	case 0x1728: /* Allwinner H6 */
 		gpio_set_cfgpin(dev, PC, 0, SUN50I_GPC_SPI0);
-		gpio_set_cfgpin(dev, PC, 1, SUN50I_GPC_SPI0);
 		gpio_set_cfgpin(dev, PC, 2, SUN50I_GPC_SPI0);
 		gpio_set_cfgpin(dev, PC, 3, SUN50I_GPC_SPI0);
+		/* PC5 is SPI0-CS on the H6, and SPI0-HOLD on the V831 */
+		gpio_set_cfgpin(dev, PC, 5, SUN50I_GPC_SPI0);
 		break;
 	default: /* Unknown/Unsupported SoC */
 		printf("SPI support not implemented yet for %x (%s)!\n",