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The sdhci controller on xilinx zynq devices will not function unless the CD bit is provided. http://www.xilinx.com/support/answers/61064.html In cases where it is impossible to provide the CD bit in hardware, setting the controller to test mode and then setting inserted to true will get the controller to function without the CD bit. The device property "xlnx,fails-without-test-cd" will let the arasan driver know the controller does not have the CD line wired and that the controller does not function without it. Signed-off-by: Zach Brown <zach.brown@ni.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
79 lines
3.1 KiB
Plaintext
79 lines
3.1 KiB
Plaintext
Device Tree Bindings for the Arasan SDHCI Controller
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The bindings follow the mmc[1], clock[2], interrupt[3] and phy[4] bindings.
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Only deviations are documented here.
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[1] Documentation/devicetree/bindings/mmc/mmc.txt
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[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
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[3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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[4] Documentation/devicetree/bindings/phy/phy-bindings.txt
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Required Properties:
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- compatible: Compatibility string. One of:
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- "arasan,sdhci-8.9a": generic Arasan SDHCI 8.9a PHY
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- "arasan,sdhci-4.9a": generic Arasan SDHCI 4.9a PHY
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- "arasan,sdhci-5.1": generic Arasan SDHCI 5.1 PHY
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- "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1": rk3399 eMMC PHY
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For this device it is strongly suggested to include arasan,soc-ctl-syscon.
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- reg: From mmc bindings: Register location and length.
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- clocks: From clock bindings: Handles to clock inputs.
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- clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
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- interrupts: Interrupt specifier
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- interrupt-parent: Phandle for the interrupt controller that services
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interrupts for this device.
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Required Properties for "arasan,sdhci-5.1":
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- phys: From PHY bindings: Phandle for the Generic PHY for arasan.
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- phy-names: MUST be "phy_arasan".
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Optional Properties:
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- arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
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used to access core corecfg registers. Offsets of registers in this
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syscon are determined based on the main compatible string for the device.
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- clock-output-names: If specified, this will be the name of the card clock
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which will be exposed by this device. Required if #clock-cells is
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specified.
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- #clock-cells: If specified this should be the value <0>. With this property
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in place we will export a clock representing the Card Clock. This clock
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is expected to be consumed by our PHY. You must also specify
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- xlnx,fails-without-test-cd: when present, the controller doesn't work when
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the CD line is not connected properly, and the line is not connected
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properly. Test mode can be used to force the controller to function.
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Example:
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sdhci@e0100000 {
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compatible = "arasan,sdhci-8.9a";
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reg = <0xe0100000 0x1000>;
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clock-names = "clk_xin", "clk_ahb";
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clocks = <&clkc 21>, <&clkc 32>;
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interrupt-parent = <&gic>;
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interrupts = <0 24 4>;
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} ;
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sdhci@e2800000 {
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compatible = "arasan,sdhci-5.1";
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reg = <0xe2800000 0x1000>;
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clock-names = "clk_xin", "clk_ahb";
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clocks = <&cru 8>, <&cru 18>;
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interrupt-parent = <&gic>;
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interrupts = <0 24 4>;
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phys = <&emmc_phy>;
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phy-names = "phy_arasan";
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} ;
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sdhci: sdhci@fe330000 {
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compatible = "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1";
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reg = <0x0 0xfe330000 0x0 0x10000>;
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interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cru SCLK_EMMC>, <&cru ACLK_EMMC>;
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clock-names = "clk_xin", "clk_ahb";
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arasan,soc-ctl-syscon = <&grf>;
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assigned-clocks = <&cru SCLK_EMMC>;
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assigned-clock-rates = <200000000>;
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clock-output-names = "emmc_cardclock";
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phys = <&emmc_phy>;
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phy-names = "phy_arasan";
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#clock-cells = <0>;
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status = "disabled";
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};
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