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From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Jonathan Bakker <xc-racer2@live.ca>,
        =?UTF-8?q?Pawe=C5=82=20Chmiel?= <pawel.mikolaj.chmiel@gmail.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org
Subject: [PATCH 11/25] ARM: dts: s5pv210: add RTC 32 KHz clock in Aries family
Date:   Mon,  7 Sep 2020 18:11:27 +0200
Message-Id: <20200907161141.31034-12-krzk@kernel.org>
In-Reply-To: <20200907161141.31034-1-krzk@kernel.org>
References: <20200907161141.31034-1-krzk@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The S3C RTC requires 32768 Hz clock as input which is provided by PMIC.
However there is no such clock provider but rather a regulator driver
which registers the clock as a regulator.  This is an old driver which
will not be updated so add a workaround - a fixed-clock to fill missing
clock phandle reference in S3C RTC.

This fixes dtbs_check warnings:

  rtc@e2800000: clocks: [[2, 145]] is too short
  rtc@e2800000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm/boot/dts/s5pv210-aries.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/s5pv210-aries.dtsi b/arch/arm/boot/dts/s5pv210-aries.dtsi
index 6ba23562da46..86c3b26fd21e 100644
--- a/arch/arm/boot/dts/s5pv210-aries.dtsi
+++ b/arch/arm/boot/dts/s5pv210-aries.dtsi
@@ -47,6 +47,13 @@
 		};
 	};
 
+	pmic_ap_clk: clock-0 {
+		/* Workaround for missing clock on PMIC */
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+	};
+
 	bt_codec: bt_sco {
 		compatible = "linux,bt-sco";
 		#sound-dai-cells = <0>;
@@ -825,6 +832,11 @@
 	samsung,pwm-outputs = <1>;
 };
 
+&rtc {
+	clocks = <&clocks CLK_RTC>, <&pmic_ap_clk>;
+	clock-names = "rtc", "rtc_src";
+};
+
 &sdhci1 {
 	#address-cells = <1>;
 	#size-cells = <0>;
-- 
2.17.1