linux-kernel - [PATCH v3 1/8] arm64: dts: qcom: 8x16: Add fixed rate on-board oscillator

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Date:	Tue, 20 Oct 2015 19:57:53 +0300
From:	Georgi Djakov <georgi.djakov@...aro.org>
To:	sboyd@...eaurora.org, agross@...eaurora.org
Cc:	mturquette@...libre.com, linux-clk@...r.kernel.org,
	bjorn.andersson@...ymobile.com, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, georgi.djakov@...aro.org
Subject: [PATCH v3 1/8] arm64: dts: qcom: 8x16: Add fixed rate on-board oscillator

Add the on-board XO oscillator. This patch prepares for adding support
for RPM controlled clocks. In order to do smooth transition and support
both cases (RPM clock driver is enabled or nor), we first move the XO to
the DT and change the GCC fixed-rate root clock to a dummy pass-through
clock. Then if the RPM driver is enabled, we set the parent of the XO
clock in the RPM clock driver to xo_board.
The advantage of doing so is that the rate of the XO clock is not hard-
coded in the GCC driver anymore, but comes from the board layout, so
that is why it should be in DT anyway.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---
 arch/arm64/boot/dts/qcom/msm8916.dtsi |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
index 8748fcca70f4..355a2acea796 100644
--- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
@@ -80,6 +80,15 @@
 			     <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
 	};

+	clocks {
+		xo_board: xo_board {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <19200000>;
+			clock-output-names = "xo_board";
+		};
+	};
+
 	soc: soc {
 		#address-cells = <1>;
 		#size-cells = <1>;
--
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