Commit f8085bba authored Oct 12, 2015 by Alexandru M Stan Committed by Ulf Hansson Oct 26, 2015

mmc: dw_mmc-rockchip: dt-binding: Add tuning related things



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>

parent e0848f5d

Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt

+13 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,19 @@ Required Properties:
		before RK3288
		- "rockchip,rk3288-dw-mshc": for Rockchip RK3288

		Optional Properties:
		* clocks: from common clock binding: if ciu_drive and ciu_sample are
		specified in clock-names, should contain handles to these clocks.

		* clock-names: Apart from the clock-names described in synopsys-dw-mshc.txt
		two more clocks "ciu-drive" and "ciu-sample" are supported. They are used
		to control the clock phases, "ciu-sample" is required for tuning high-
		speed modes.

		* rockchip,default-sample-phase: The default phase to set ciu_sample at
		probing, low speeds or in case where all phases work at tuning time.
		If not specified 0 deg will be used.

		Example:

		rkdwmmc0@12200000 {