From b31fc90c14d9e584ac19983686cecab3e0764289 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Tue, 4 Aug 2015 14:28:04 +0200 Subject: [PATCH] clk: shmobile: r8a7779: Add CPG/MSTP Clock Domain support Add Clock Domain support to the R-Car H1 Clock Pulse Generator (CPG) driver using the generic PM Domain. This allows to power-manage the module clocks of SoC devices that are part of the CPG/MSTP Clock Domain using Runtime PM, or for system suspend/resume. SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed through an MSTP clock should be tagged in DT with a proper "power-domains" property. Also update the reg property in the DT binding doc example to match the actual dtsi, which uses #address-cells and #size-cells == 1, not 2. Signed-off-by: Geert Uytterhoeven Acked-by: Stephen Boyd Reviewed-by: Ulf Hansson Signed-off-by: Simon Horman --- .../clock/renesas,r8a7779-cpg-clocks.txt | 30 ++++++++++++++++--- drivers/clk/shmobile/clk-r8a7779.c | 2 ++ 2 files changed, 28 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt index ed3c8cb12f4e..8c81547c29f5 100644 --- a/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt +++ b/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt @@ -1,7 +1,9 @@ * Renesas R8A7779 Clock Pulse Generator (CPG) The CPG generates core clocks for the R8A7779. It includes one PLL and -several fixed ratio dividers +several fixed ratio dividers. +The CPG also provides a Clock Domain for SoC devices, in combination with the +CPG Module Stop (MSTP) Clocks. Required Properties: @@ -12,16 +14,36 @@ Required Properties: - #clock-cells: Must be 1 - clock-output-names: The names of the clocks. Supported clocks are "plla", "z", "zs", "s", "s1", "p", "b", "out". + - #power-domain-cells: Must be 0 +SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed +through an MSTP clock should refer to the CPG device node in their +"power-domains" property, as documented by the generic PM domain bindings in +Documentation/devicetree/bindings/power/power_domain.txt. -Example -------- + +Examples +-------- + + - CPG device node: cpg_clocks: cpg_clocks@ffc80000 { compatible = "renesas,r8a7779-cpg-clocks"; - reg = <0 0xffc80000 0 0x30>; + reg = <0xffc80000 0x30>; clocks = <&extal_clk>; #clock-cells = <1>; clock-output-names = "plla", "z", "zs", "s", "s1", "p", "b", "out"; + #power-domain-cells = <0>; + }; + + + - CPG/MSTP Clock Domain member device node: + + sata: sata@fc600000 { + compatible = "renesas,sata-r8a7779", "renesas,rcar-sata"; + reg = <0xfc600000 0x2000>; + interrupts = <0 100 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&mstp1_clks R8A7779_CLK_SATA>; + power-domains = <&cpg_clocks>; }; diff --git a/drivers/clk/shmobile/clk-r8a7779.c b/drivers/clk/shmobile/clk-r8a7779.c index 652ecacb6daf..e42a63a2ad25 100644 --- a/drivers/clk/shmobile/clk-r8a7779.c +++ b/drivers/clk/shmobile/clk-r8a7779.c @@ -168,6 +168,8 @@ static void __init r8a7779_cpg_clocks_init(struct device_node *np) } of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); + + cpg_mstp_add_clk_domain(np); } CLK_OF_DECLARE(r8a7779_cpg_clks, "renesas,r8a7779-cpg-clocks", r8a7779_cpg_clocks_init); -- 2.20.1