linux-kernel - [PATCH] ARM: dts: r8a7791: Don't disable referenced optional clocks

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Message-Id: <1459947173-6664-1-git-send-email-sjoerd.simons@collabora.co.uk>
Date:	Wed,  6 Apr 2016 14:52:53 +0200
From:	Sjoerd Simons <sjoerd.simons@...labora.co.uk>
To:	Simon Horman <horms@...ge.net.au>
Cc:	linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] ARM: dts: r8a7791: Don't disable referenced optional clocks

clk_get on a disabled clock node will return EPROBE_DEFER, which can
cause drivers to be deferred forever if such clocks are referenced in
their clocks property.

Update the various disabled external clock nodes to default to a
frequency of 0, but don't disable them to prevent this.

Signed-off-by: Sjoerd Simons <sjoerd.simons@...labora.co.uk>

---

 arch/arm/boot/dts/r8a7791-koelsch.dts | 1 +
 arch/arm/boot/dts/r8a7791-porter.dts  | 1 +
 arch/arm/boot/dts/r8a7791.dtsi        | 5 +----
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts
index 1adf877..da59c28 100644
--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -660,6 +660,7 @@
 };
 
 &pcie_bus_clk {
+	clock-frequency = <100000000>;
 	status = "okay";
 };
 
diff --git a/arch/arm/boot/dts/r8a7791-porter.dts b/arch/arm/boot/dts/r8a7791-porter.dts
index 9554d13..19b257e 100644
--- a/arch/arm/boot/dts/r8a7791-porter.dts
+++ b/arch/arm/boot/dts/r8a7791-porter.dts
@@ -413,6 +413,7 @@
 };
 
 &pcie_bus_clk {
+	clock-frequency = <100000000>;
 	status = "okay";
 };
 
diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi
index 8693888..676df63 100644
--- a/arch/arm/boot/dts/r8a7791.dtsi
+++ b/arch/arm/boot/dts/r8a7791.dtsi
@@ -1104,8 +1104,7 @@
 		pcie_bus_clk: pcie_bus {
 			compatible = "fixed-clock";
 			#clock-cells = <0>;
-			clock-frequency = <100000000>;
-			status = "disabled";
+			clock-frequency = <0>;
 		};
 
 		/* External SCIF clock */
@@ -1114,7 +1113,6 @@
 			#clock-cells = <0>;
 			/* This value must be overridden by the board. */
 			clock-frequency = <0>;
-			status = "disabled";
 		};
 
 		/* External USB clock - can be overridden by the board */
@@ -1130,7 +1128,6 @@
 			#clock-cells = <0>;
 			/* This value must be overridden by the board. */
 			clock-frequency = <0>;
-			status = "disabled";
 		};
 
 		/* Special CPG clocks */
-- 
2.8.0.rc3