linux-kernel - [PATCH 4/4] clk: dt: st: Introduce clock domain documentation

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Message-Id: <1422270840-3039-5-git-send-email-lee.jones@linaro.org>
Date:	Mon, 26 Jan 2015 11:14:00 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	lee.jones@...aro.org, kernel@...inux.com, mturquette@...aro.org,
	sboyd@...eaurora.org, devicetree@...r.kernel.org
Subject: [PATCH 4/4] clk: dt: st: Introduce clock domain documentation

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 .../devicetree/bindings/clock/st/st,clk-domain.txt | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/st/st,clk-domain.txt

diff --git a/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt b/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt
new file mode 100644
index 0000000..7309937
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/st/st,clk-domain.txt
@@ -0,0 +1,34 @@
+STMicroelectronics Clock Domain
+
+ST hardware have a bunch of clocks which must not be turned off.
+If drivers a) fail to obtain a reference to any of these or b) give
+up a previously obtained reference during suspend, the common clk
+framework will attempt to turn them off and the hardware will
+subsequently die.  The only way to recover from this failure is to
+restart.
+
+To avoid either of these two scenarios from catastrophically
+disabling the running system we have implemented a clock domain
+where clocks are consumed and references are taken, thus preventing
+them from being shut down by the framework.
+
+We use the generic clock bindings found in:
+  Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : Must be "st,clk-domain"
+
+Example:
+
+clk-domain {
+	compatible = "st,clk-domain";
+	clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>,
+		 <&clk_s_c0_flexgen CLK_COMPO_DVP>,
+		 <&clk_s_c0_flexgen CLK_MMC_1>,
+		 <&clk_s_c0_flexgen CLK_ICN_SBC>,
+		 <&clk_s_c0_flexgen CLK_ICN_LMI>,
+		 <&clk_s_c0_flexgen CLK_ICN_CPU>,
+		 <&clk_s_c0_flexgen CLK_TX_ICN_DMU>,
+		 <&clk_s_a0_flexgen CLK_IC_LMI0>,
+		 <&clk_m_a9>;
+};
-- 
1.9.1

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