On all Exynos SoCs there is a dedicated CLKOUT pin that allows many of internal SoC clocks to be output from the SoC. The hardware structure of CLKOUT related clocks looks as follows: CMU |---> clock0 ---------> | PMU | | | | several |---> clock1 ---------> | mux | muxes | | + |---> CLKOUT dividers | ... | gate | and gates | | | |---> clockN ---------> | | Since the block responsible for handling the pin is PMU, not CMU, a separate driver, that binds to PMU node is required and acquires all input clocks by standard DT clock look-up. This way we don't need any cross-IP block drivers and cross-driver register sharing or nodes for fake devices. To represent the PMU mux/gate clock, generic composite clock is registered. Tested on Odroid U3, with HSIC/USB hub using CLKOUT as reference clock, with some additional patches. Changes since v1: (http://www.spinics.net/lists/arm-kernel/msg333276.html) - rebased onto next-20140624, - fixed #clock-cells values in exynos5250.dtsi and exynos5420.dtsi, - temporarily removed ISP CLKOUT clocks on Exynos4x12, until ISP clock domain handling gets fixed in Exynos4 clock driver. Changes since RFC v1: (https://lkml.org/lkml/2014/5/15/506) - rebased onto v5 of "Enable usbphy and hsotg for exynos4" series and current HEAD of samsung-clk tree, - added handling of suspend/resume in the driver, - added missing CPU clocks on Exynos4, - added CLK_SET_RATE_PARENT to CMU CLKOUT gates on Exynos4, - fixed bit field width on Exynos4, - added CLKOUT CMU registers of Exynos4 to save/restore list, - added CLK_SET_RATE_PARENT and CLK_SET_RATE_NO_REPARENT to clkout clock, - changed the binding to use 1-cell clock specifier to allow extension with further PMU clocks in future, if needed. Tomasz Figa (4): clk: samsung: exynos4: Add missing CPU/DMC clock hierarchy clk: samsung: exynos4: Add CLKOUT clock hierarchy clk: samsung: Add driver to control CLKOUT line on Exynos SoCs ARM: dts: exynos: Update PMU node with CLKOUT related data .../devicetree/bindings/arm/samsung/pmu.txt | 30 ++++ arch/arm/boot/dts/exynos4210.dtsi | 10 ++ arch/arm/boot/dts/exynos4x12.dtsi | 7 + arch/arm/boot/dts/exynos5250.dtsi | 3 + arch/arm/boot/dts/exynos5420.dtsi | 3 + drivers/clk/samsung/Makefile | 1 + drivers/clk/samsung/clk-exynos-clkout.c | 153 +++++++++++++++++++ drivers/clk/samsung/clk-exynos4.c | 166 ++++++++++++++++++++- include/dt-bindings/clock/exynos4.h | 5 + 9 files changed, 374 insertions(+), 4 deletions(-) create mode 100644 drivers/clk/samsung/clk-exynos-clkout.c -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html