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 <geert+renesas@xxxxxxxxx>
Acked-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
v4:
- Add Reviewed-by,
v3:
- Add Acked-by,
- Use "CPG/MSTP Clock Domain" instead of "CPG Clock Domain",
v2:
- New.
---
.../bindings/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 ed3c8cb12f4eb699..8c81547c29f568e8 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 af297963489f473d..92275c5f2c60303e 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);
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
