linux-kernel - [PATCH 15/25] ARM: dts: s5pv210: add RTC 32 KHz clock in Torbreck

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Date:   Mon,  7 Sep 2020 18:11:31 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jonathan Bakker <xc-racer2@...e.ca>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: [PATCH 15/25] ARM: dts: s5pv210: add RTC 32 KHz clock in Torbreck

The S3C RTC requires 32768 Hz clock as input which is provided by PMIC.
However the PMIC is not described in DTS at all so at least add
a workaround to model its clock with a fixed-clock.

This fixes dtbs_check warnings:

  rtc@...00000: clocks: [[2, 145]] is too short
  rtc@...00000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 arch/arm/boot/dts/s5pv210-torbreck.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/s5pv210-torbreck.dts b/arch/arm/boot/dts/s5pv210-torbreck.dts
index cd25e72ccd84..e18259737684 100644
--- a/arch/arm/boot/dts/s5pv210-torbreck.dts
+++ b/arch/arm/boot/dts/s5pv210-torbreck.dts
@@ -30,6 +30,13 @@
 		device_type = "memory";
 		reg = <0x20000000 0x20000000>;
 	};
+
+	pmic_ap_clk: clock-0 {
+		/* Workaround for missing PMIC and its clock */
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+	};
 };
 
 &xusbxti {
@@ -54,6 +61,8 @@
 
 &rtc {
 	status = "okay";
+	clocks = <&clocks CLK_RTC>, <&pmic_ap_clk>;
+	clock-names = "rtc", "rtc_src";
 };
 
 &sdhci0 {
-- 
2.17.1