forked from Minki/linux
f8085bbada
Add ciu_drive, ciu_sample clocks and default-sample-phase. This will later be used by tuning code. We do not touch ciu_drive (and by extension define default-drive-phase). Drive phase is mostly used to define minimum hold times, while one could write some code to determine what phase meets the minimum hold time (ex 10 degrees) this will not work with the current clock phase framework (which floors angles, so we'll get 0 deg, and there's no way to know what resolution the floors happen at). We assume that the default drive angles set by the hardware are good enough. Signed-off-by: Alexandru M Stan <amstan@chromium.org> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
* Rockchip specific extensions to the Synopsys Designware Mobile
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Storage Host Controller
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The Synopsys designware mobile storage host controller is used to interface
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a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
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differences between the core Synopsys dw mshc controller properties described
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by synopsys-dw-mshc.txt and the properties used by the Rockchip specific
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extensions to the Synopsys Designware Mobile Storage Host Controller.
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Required Properties:
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* compatible: should be
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- "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
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before RK3288
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- "rockchip,rk3288-dw-mshc": for Rockchip RK3288
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Optional Properties:
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* clocks: from common clock binding: if ciu_drive and ciu_sample are
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specified in clock-names, should contain handles to these clocks.
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* clock-names: Apart from the clock-names described in synopsys-dw-mshc.txt
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two more clocks "ciu-drive" and "ciu-sample" are supported. They are used
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to control the clock phases, "ciu-sample" is required for tuning high-
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speed modes.
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* rockchip,default-sample-phase: The default phase to set ciu_sample at
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probing, low speeds or in case where all phases work at tuning time.
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If not specified 0 deg will be used.
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Example:
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rkdwmmc0@12200000 {
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compatible = "rockchip,rk3288-dw-mshc";
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reg = <0x12200000 0x1000>;
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interrupts = <0 75 0>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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