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+* Spreadtrum SDHCI controller (sdhci-sprd)
+
+The Secure Digital (SD) Host controller on Spreadtrum SoCs provides an interface
+for MMC, SD and SDIO types of cards.
+
+This file documents differences between the core properties in mmc.txt
+and the properties used by the sdhci-sprd driver.
+
+Required properties:
+- compatible: Should contain "sprd,sdhci-r11".
+- reg: physical base address of the controller and length.
+- interrupts: Interrupts used by the SDHCI controller.
+- clocks: Should contain phandle for the clock feeding the SDHCI controller
+- clock-names: Should contain the following:
+	"sdio" - SDIO source clock (required)
+	"enable" - gate clock which used for enabling/disabling the device (required)
+	"2x_enable" - gate clock controlling the device for some special platforms (optional)
+
+Optional properties:
+- assigned-clocks: the same with "sdio" clock
+- assigned-clock-parents: the default parent of "sdio" clock
+- pinctrl-names: should be "default", "state_uhs"
+- pinctrl-0: should contain default/high speed pin control
+- pinctrl-1: should contain uhs mode pin control
+
+PHY DLL delays are used to delay the data valid window, and align the window
+to sampling clock. PHY DLL delays can be configured by following properties,
+and each property contains 4 cells which are used to configure the clock data
+write line delay value, clock read command line delay value, clock read data
+positive edge delay value and clock read data negative edge delay value.
+Each cell's delay value unit is cycle of the PHY clock.
+
+- sprd,phy-delay-legacy: Delay value for legacy timing.
+- sprd,phy-delay-sd-highspeed: Delay value for SD high-speed timing.
+- sprd,phy-delay-sd-uhs-sdr50: Delay value for SD UHS SDR50 timing.
+- sprd,phy-delay-sd-uhs-sdr104: Delay value for SD UHS SDR50 timing.
+- sprd,phy-delay-mmc-highspeed: Delay value for MMC high-speed timing.
+- sprd,phy-delay-mmc-ddr52: Delay value for MMC DDR52 timing.
+- sprd,phy-delay-mmc-hs200: Delay value for MMC HS200 timing.
+- sprd,phy-delay-mmc-hs400: Delay value for MMC HS400 timing.
+- sprd,phy-delay-mmc-hs400es: Delay value for MMC HS400 enhanced strobe timing.
+
+Examples:
+
+sdio0: sdio@20600000 {
+	compatible  = "sprd,sdhci-r11";
+	reg = <0 0x20600000 0 0x1000>;
+	interrupts = <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
+
+	clock-names = "sdio", "enable";
+	clocks = <&ap_clk CLK_EMMC_2X>,
+		 <&apahb_gate CLK_EMMC_EB>;
+	assigned-clocks = <&ap_clk CLK_EMMC_2X>;
+	assigned-clock-parents = <&rpll CLK_RPLL_390M>;
+
+	pinctrl-names = "default", "state_uhs";
+	pinctrl-0 = <&sd0_pins_default>;
+	pinctrl-1 = <&sd0_pins_uhs>;
+
+	sprd,phy-delay-sd-uhs-sdr104 = <0x3f 0x7f 0x2e 0x2e>;
+	bus-width = <8>;
+	non-removable;
+	no-sdio;
+	no-sd;
+	cap-mmc-hw-reset;
+	status = "okay";
+};