linux-kernel - [PATCH v4 15/16] clk: shmobile: mstp: Consider "zb

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Message-Id: <1438691297-29235-16-git-send-email-geert+renesas@glider.be>
Date:	Tue,  4 Aug 2015 14:28:16 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v4 15/16] clk: shmobile: mstp: Consider "zb_clk" suitable for power management

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@...der.be>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.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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