linux-kernel - [PATCH 14/25] ARM: dts: s5pv210: add RTC 32 KHz clock in SMDKV210

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Date:   Mon,  7 Sep 2020 18:11:30 +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 14/25] ARM: dts: s5pv210: add RTC 32 KHz clock in SMDKV210

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-smdkv210.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/s5pv210-smdkv210.dts b/arch/arm/boot/dts/s5pv210-smdkv210.dts
index 84b38f185199..1f20622da719 100644
--- a/arch/arm/boot/dts/s5pv210-smdkv210.dts
+++ b/arch/arm/boot/dts/s5pv210-smdkv210.dts
@@ -31,6 +31,13 @@
 		reg = <0x20000000 0x40000000>;
 	};
 
+	pmic_ap_clk: clock-0 {
+		/* Workaround for missing PMIC and its clock */
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+	};
+
 	ethernet@...00000 {
 		compatible = "davicom,dm9000";
 		reg = <0xA8000000 0x2 0xA8000002 0x2>;
@@ -147,6 +154,8 @@
 
 &rtc {
 	status = "okay";
+	clocks = <&clocks CLK_RTC>, <&pmic_ap_clk>;
+	clock-names = "rtc", "rtc_src";
 };
 
 &sdhci0 {
-- 
2.17.1