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From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Rob Herring <robh+dt@kernel.org>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        "Denis GNUtoo Carikli" <GNUtoo@cyberdimension.org>,
        Simon Shields <simon@lineageos.org>
Cc:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Sylwester Nawrocki <snawrocki@kernel.org>
Subject: [PATCH 32/33] ARM: dts: exynos: Correct S3C RTC bindings in Tiny4412
Date:   Sun, 30 Aug 2020 15:51:59 +0200
Message-Id: <20200830135200.24304-32-krzk@kernel.org>
In-Reply-To: <20200830135200.24304-1-krzk@kernel.org>
References: <20200830135200.24304-1-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 the PMIC is not described in DTS at all so at least add a
workaround to model its clock with fixed-clock.  This fixes S3C RTC and
silences dtbs_check warnings like:

  arch/arm/boot/dts/exynos4412-tiny4412.dt.yaml: rtc@10070000: clocks: [[7, 346]] is too short
  arch/arm/boot/dts/exynos4412-tiny4412.dt.yaml: rtc@10070000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm/boot/dts/exynos4412-tiny4412.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-tiny4412.dts b/arch/arm/boot/dts/exynos4412-tiny4412.dts
index 7512c86e634e..017b26108bb0 100644
--- a/arch/arm/boot/dts/exynos4412-tiny4412.dts
+++ b/arch/arm/boot/dts/exynos4412-tiny4412.dts
@@ -65,6 +65,13 @@
 			compatible = "samsung,clock-xusbxti";
 			clock-frequency = <24000000>;
 		};
+
+		pmic_ap_clk: pmic-ap-clk {
+			/* Workaround for missing clock on PMIC */
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <32768>;
+		};
 	};
 
 	panel {
@@ -110,6 +117,8 @@
 
 &rtc {
 	status = "okay";
+	clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
+	clock-names = "rtc", "rtc_src";
 };
 
 &sdhci_2 {
-- 
2.17.1