Messages in this thread Patch in this message | | | From | Lee Jones <> | Subject | [PATCH 4/4] clk: dt: st: Introduce clock domain documentation | Date | Mon, 26 Jan 2015 11:14:00 +0000 |
| |
Signed-off-by: Lee Jones <lee.jones@linaro.org> --- .../devicetree/bindings/clock/st/st,clk-domain.txt | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/st/st,clk-domain.txt
diff --git a/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt b/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt new file mode 100644 index 0000000..7309937 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt @@ -0,0 +1,34 @@ +STMicroelectronics Clock Domain + +ST hardware have a bunch of clocks which must not be turned off. +If drivers a) fail to obtain a reference to any of these or b) give +up a previously obtained reference during suspend, the common clk +framework will attempt to turn them off and the hardware will +subsequently die. The only way to recover from this failure is to +restart. + +To avoid either of these two scenarios from catastrophically +disabling the running system we have implemented a clock domain +where clocks are consumed and references are taken, thus preventing +them from being shut down by the framework. + +We use the generic clock bindings found in: + Documentation/devicetree/bindings/clock/clock-bindings.txt + +Required properties: +- compatible : Must be "st,clk-domain" + +Example: + +clk-domain { + compatible = "st,clk-domain"; + clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>, + <&clk_s_c0_flexgen CLK_COMPO_DVP>, + <&clk_s_c0_flexgen CLK_MMC_1>, + <&clk_s_c0_flexgen CLK_ICN_SBC>, + <&clk_s_c0_flexgen CLK_ICN_LMI>, + <&clk_s_c0_flexgen CLK_ICN_CPU>, + <&clk_s_c0_flexgen CLK_TX_ICN_DMU>, + <&clk_s_a0_flexgen CLK_IC_LMI0>, + <&clk_m_a9>; +}; -- 1.9.1
| |