Add Clock Domain support to the RZ 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 Clock Domain using
Runtime PM, or for system suspend/resume.
SoC devices that are part of the CPG Clock Domain and can be
power-managed through an MSTP clock should be tagged in DT with a proper
"power-domains" property.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v2:
- New.
---
.../bindings/clock/renesas,rz-cpg-clocks.txt | 29 ++++++++++++++++++++--
arch/arm/mach-shmobile/Kconfig | 1 +
drivers/clk/shmobile/clk-rz.c | 3 +++
3 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/clock/renesas,rz-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,rz-cpg-clocks.txt
index 98a257492522cd45..c5666288e409ebd2 100644
--- a/Documentation/devicetree/bindings/clock/renesas,rz-cpg-clocks.txt
+++ b/Documentation/devicetree/bindings/clock/renesas,rz-cpg-clocks.txt
@@ -2,6 +2,8 @@
The CPG generates core clocks for the RZ SoCs. It includes the PLL, variable
CPU and GPU clocks, and 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:
@@ -14,10 +16,18 @@ Required Properties:
- #clock-cells: Must be 1
- clock-output-names: The names of the clocks. Supported clocks are "pll",
"i", and "g"
+ - #power-domain-cells: Must be 0
+SoC devices that are part of the CPG 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@fcfe0000 {
#clock-cells = <1>;
@@ -26,4 +36,19 @@ Example
reg = <0xfcfe0000 0x18>;
clocks = <&extal_clk>, <&usb_x1_clk>;
clock-output-names = "pll", "i", "g";
+ #power-domain-cells = <0>;
+ };
+
+
+ - CPG Clock Domain member device node:
+
+ mtu2: timer@fcff0000 {
+ compatible = "renesas,mtu2-r7s72100", "renesas,mtu2";
+ reg = <0xfcff0000 0x400>;
+ interrupts = <0 107 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "tgi0a";
+ clocks = <&mstp3_clks R7S72100_CLK_MTU2>;
+ clock-names = "fck";
+ power-domains = <&cpg_clocks>;
+ status = "disabled";
};
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index e14fa5e87475a0d1..34eac88a98896b63 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -51,6 +51,7 @@ config ARCH_EMEV2
config ARCH_R7S72100
bool "RZ/A1H (R7S72100)"
+ select PM_GENERIC_DOMAINS if PM
select SYS_SUPPORTS_SH_MTU2
config ARCH_R8A73A4
diff --git a/drivers/clk/shmobile/clk-rz.c b/drivers/clk/shmobile/clk-rz.c
index 7e68e86309625c9e..9766e3cb595fd257 100644
--- a/drivers/clk/shmobile/clk-rz.c
+++ b/drivers/clk/shmobile/clk-rz.c
@@ -10,6 +10,7 @@
*/
#include <linux/clk-provider.h>
+#include <linux/clk/shmobile.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/of.h>
@@ -99,5 +100,7 @@ static void __init rz_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(rz_cpg_clks, "renesas,rz-cpg-clocks", rz_cpg_clocks_init);
--
1.9.1
--
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