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-* Samsung Exynos specific extensions to the Synopsys Designware Mobile
- Storage Host Controller
-
-The Synopsys designware mobile storage host controller is used to interface
-a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
-differences between the core Synopsys dw mshc controller properties described
-by synopsys-dw-mshc.txt and the properties used by the Samsung Exynos specific
-extensions to the Synopsys Designware Mobile Storage Host Controller.
-
-Required Properties:
-
-* compatible: should be
- - "samsung,exynos4210-dw-mshc": for controllers with Samsung Exynos4210
- specific extensions.
- - "samsung,exynos4412-dw-mshc": for controllers with Samsung Exynos4412
- specific extensions.
- - "samsung,exynos5250-dw-mshc": for controllers with Samsung Exynos5250
- specific extensions.
- - "samsung,exynos5420-dw-mshc": for controllers with Samsung Exynos5420
- specific extensions.
- - "samsung,exynos7-dw-mshc": for controllers with Samsung Exynos7
- specific extensions.
- - "samsung,exynos7-dw-mshc-smu": for controllers with Samsung Exynos7
- specific extensions having an SMU.
- - "axis,artpec8-dw-mshc": for controllers with ARTPEC-8 specific
- extensions.
-
-* samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface
- unit (ciu) clock. This property is applicable only for Exynos5 SoC's and
- ignored for Exynos4 SoC's. The valid range of divider value is 0 to 7.
-
-* samsung,dw-mshc-sdr-timing: Specifies the value of CIU clock phase shift value
- in transmit mode and CIU clock phase shift value in receive mode for single
- data rate mode operation. Refer notes below for the order of the cells and the
- valid values.
-
-* samsung,dw-mshc-ddr-timing: Specifies the value of CUI clock phase shift value
- in transmit mode and CIU clock phase shift value in receive mode for double
- data rate mode operation. Refer notes below for the order of the cells and the
- valid values.
-* samsung,dw-mshc-hs400-timing: Specifies the value of CIU TX and RX clock phase
- shift value for hs400 mode operation.
-
- Notes for the sdr-timing and ddr-timing values:
-
- The order of the cells should be
- - First Cell: CIU clock phase shift value for tx mode.
- - Second Cell: CIU clock phase shift value for rx mode.
-
- Valid values for SDR and DDR CIU clock timing for Exynos5250:
- - valid value for tx phase shift and rx phase shift is 0 to 7.
- - when CIU clock divider value is set to 3, all possible 8 phase shift
- values can be used.
- - if CIU clock divider value is 0 (that is divide by 1), both tx and rx
- phase shift clocks should be 0.
-
-* samsung,read-strobe-delay: RCLK (Data strobe) delay to control HS400 mode
- (Latency value for delay line in Read path)
-
-Required properties for a slot (Deprecated - Recommend to use one slot per host):
-
-* gpios: specifies a list of gpios used for command, clock and data bus. The
- first gpio is the command line and the second gpio is the clock line. The
- rest of the gpios (depending on the bus-width property) are the data lines in
- no particular order. The format of the gpio specifier depends on the gpio
- controller.
-(Deprecated - Refer to Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt)
-
-Example:
-
- The MSHC controller node can be split into two portions, SoC specific and
- board specific portions as listed below.
-
- dwmmc0@12200000 {
- compatible = "samsung,exynos5250-dw-mshc";
- reg = <0x12200000 0x1000>;
- interrupts = <0 75 0>;
- #address-cells = <1>;
- #size-cells = <0>;
- };
-
- dwmmc0@12200000 {
- cap-mmc-highspeed;
- cap-sd-highspeed;
- broken-cd;
- fifo-depth = <0x80>;
- card-detect-delay = <200>;
- samsung,dw-mshc-ciu-div = <3>;
- samsung,dw-mshc-sdr-timing = <2 3>;
- samsung,dw-mshc-ddr-timing = <1 2>;
- samsung,dw-mshc-hs400-timing = <0 2>;
- samsung,read-strobe-delay = <90>;
- bus-width = <8>;
- };