[PATCH v2 5/7] riscv: dts: spacemit: k1: add SD card controller and pinctrl support

[Iker Pedrosa <ikerpedrosam@gmail.com>]

Add SD card controller infrastructure for SpacemiT K1 SoC with complete
pinctrl support for both standard and UHS modes.

- Add sdhci0 controller definition with clocks, resets and interrupts
- Add mmc1_cfg pinctrl for 3.3V standard SD operation
- Add mmc1_uhs_cfg pinctrl for 1.8V UHS high-speed operation
- Configure appropriate drive strength and power-source properties

This provides complete SD card infrastructure that K1-based boards can
enable.

Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
---
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi | 40 ++++++++++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi         | 13 +++++++++
 2 files changed, 53 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
index b13dcb10f4d66022d27307de73a6ea3287e97441..8d82011f1af666fb78c282a2abcc0cb88f962053 100644
--- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -570,4 +570,44 @@ pwm14-1-pins {
 			drive-strength = <32>;
 		};
 	};
+
+	mmc1_cfg: mmc1-cfg {
+		mmc1-data-cmd-pins {
+			pinmux = <K1_PADCONF(104, 0)>,   /* mmc1_d3 */
+				 <K1_PADCONF(105, 0)>,   /* mmc1_d2 */
+				 <K1_PADCONF(106, 0)>,   /* mmc1_d1 */
+				 <K1_PADCONF(107, 0)>,   /* mmc1_d0 */
+				 <K1_PADCONF(108, 0)>;   /* mmc1_cmd */
+			bias-pull-up = <1>;
+			drive-strength = <7>;
+			power-source = <3300>;
+		};
+
+		mmc1-clk-pins {
+			pinmux = <K1_PADCONF(109, 0)>;   /* mmc1_clk */
+			bias-pull-down = <1>;
+			drive-strength = <7>;
+			power-source = <3300>;
+		};
+	};
+
+	mmc1_uhs_cfg: mmc1-uhs-cfg {
+		mmc1-data-cmd-pins {
+			pinmux = <K1_PADCONF(104, 0)>,   /* mmc1_d3 */
+				 <K1_PADCONF(105, 0)>,   /* mmc1_d2 */
+				 <K1_PADCONF(106, 0)>,   /* mmc1_d1 */
+				 <K1_PADCONF(107, 0)>,   /* mmc1_d0 */
+				 <K1_PADCONF(108, 0)>;   /* mmc1_cmd */
+			bias-pull-up = <1>;
+			drive-strength = <13>;
+			power-source = <1800>;
+		};
+
+		mmc1-clk-pins {
+			pinmux = <K1_PADCONF(109, 0)>;   /* mmc1_clk */
+			bias-pull-down = <1>;
+			drive-strength = <13>;
+			power-source = <1800>;
+		};
+	};
 };
diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index 529ec68e9c23eb2a93c04e9ccd3f22a01c4cc4ff..1e9e4f4f41c196326f20c0e5ae6721ea85ea5091 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -1207,6 +1207,19 @@ emmc: mmc@d4281000 {
 				interrupts = <101>;
 				status = "disabled";
 			};
+
+			sdhci0: mmc@d4280000 {
+				compatible = "spacemit,k1-sdhci";
+				reg = <0x0 0xd4280000 0x0 0x200>;
+				clocks = <&syscon_apmu CLK_SDH_AXI>,
+					 <&syscon_apmu CLK_SDH0>;
+				clock-names = "core", "io";
+				resets = <&syscon_apmu RESET_SDH_AXI>,
+					 <&syscon_apmu RESET_SDH0>;
+				reset-names = "axi", "sdh";
+				interrupts = <99>;
+				status = "disabled";
+			};
 		};
 	};
 };

-- 
2.53.0