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Subject[PATCH v4 15/16] clk: shmobile: mstp: Consider "zb_clk" suitable for power management
Date
Currently the CPG/MSTP Clock Domain code looks for MSTP clocks to power
manage a device.

Unfortunately, on R-Mobile APE6 (r8a73a4) and SH-Mobile AG5 (sh73a0),
the Bus State Controller (BSC) is not power-managed by an MSTP clock,
but by a plain CPG clock (zb_clk). Add a special case to handle this,
so the clock is properly managed, and devices connected to the BSC work
as expected.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
---
v4:
- Add Reviewed-by,

v3:
- Use "CPG/MSTP Clock Domain" instead of "CPG Clock Domain",

v2:
- New.
---
drivers/clk/shmobile/clk-mstp.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/clk/shmobile/clk-mstp.c b/drivers/clk/shmobile/clk-mstp.c
index b1df7b2f1e970adb..a117c3f0f257b5e1 100644
--- a/drivers/clk/shmobile/clk-mstp.c
+++ b/drivers/clk/shmobile/clk-mstp.c
@@ -259,6 +259,10 @@ int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev)
"renesas,cpg-mstp-clocks"))
goto found;

+ /* BSC on r8a73a4/sh73a0 uses zb_clk instead of an mstp clock*/
+ if (!strcmp(clkspec.np->name, "zb_clk"))
+ goto found;
+
of_node_put(clkspec.np);
i++;
}
--
1.9.1


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