linux-kernel - [PATCH v4 7/7] ARM: dts: sun9i: Switch to the AC100 RTC clock outputs for osc32k

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Message-Id: <1467302331-9663-8-git-send-email-wens@csie.org>
Date:	Thu, 30 Jun 2016 23:58:51 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Lee Jones <lee.jones@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
	rtc-linux@...glegroups.com, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 7/7] ARM: dts: sun9i: Switch to the AC100 RTC clock outputs for osc32k

The 32.768 kHz clock inside the A80 SoC is fed from an external source,
typically the AC100 RTC module.

Make the osc32k placeholder a fixed-factor clock so board dts files can
specify its source.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
Changes since v3: none
Changes since v2: none
Changes since v1: none
---
 arch/arm/boot/dts/sun9i-a80-cubieboard4.dts | 5 +++++
 arch/arm/boot/dts/sun9i-a80-optimus.dts     | 5 +++++
 arch/arm/boot/dts/sun9i-a80.dtsi            | 9 +++------
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts b/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts
index cf2f4b72a841..04b014603659 100644
--- a/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts
+++ b/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts
@@ -103,6 +103,11 @@
 	allwinner,drive = <SUN4I_PINCTRL_40_MA>;
 };
 
+&osc32k {
+	/* osc32k input is from AC100 */
+	clocks = <&ac100_rtc 0>;
+};
+
 &pio {
 	led_pins_cubieboard4: led-pins@0 {
 		allwinner,pins = "PH6", "PH17";
diff --git a/arch/arm/boot/dts/sun9i-a80-optimus.dts b/arch/arm/boot/dts/sun9i-a80-optimus.dts
index e35c06c162a7..fd874ded890e 100644
--- a/arch/arm/boot/dts/sun9i-a80-optimus.dts
+++ b/arch/arm/boot/dts/sun9i-a80-optimus.dts
@@ -152,6 +152,11 @@
 	status = "okay";
 };
 
+&osc32k {
+	/* osc32k input is from AC100 */
+	clocks = <&ac100_rtc 0>;
+};
+
 &pio {
 	led_pins_optimus: led-pins@0 {
 		allwinner,pins = "PH0", "PH1";
diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi
index f68b3242b33a..dd11115ec087 100644
--- a/arch/arm/boot/dts/sun9i-a80.dtsi
+++ b/arch/arm/boot/dts/sun9i-a80.dtsi
@@ -148,15 +148,12 @@
 
 		/*
 		 * The 32k clock is from an external source, normally the
-		 * AC100 codec/RTC chip. This clock is by default enabled
-		 * and clocked at 32768 Hz, from the oscillator connected
-		 * to the AC100. It is configurable, but no such driver or
-		 * bindings exist yet.
+		 * AC100 codec/RTC chip. This serves as a placeholder for
+		 * board dts files to specify the source.
 		 */
 		osc32k: osc32k_clk {
 			#clock-cells = <0>;
-			compatible = "fixed-clock";
-			clock-frequency = <32768>;
+			compatible = "fixed-factor-clock";
 			clock-output-names = "osc32k";
 		};
 
-- 
2.8.1