linux-kernel - [RFC PATCH 10/11] arm64: dts: imx8mn: add dumy clock

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Date:   Sat, 31 Dec 2022 11:47:35 +0100
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     tommaso.merciai@...rulasolutions.com,
        linux-amarula@...rulasolutions.com,
        Chen-Yu Tsai <wenst@...omium.org>, jagan@...rulasolutions.com,
        angelo@...rulasolutions.com, anthony@...rulasolutions.com,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Abel Vesa <abelvesa@...nel.org>,
        Adam Ford <aford173@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Li Jun <jun.li@....com>, Lucas Stach <l.stach@...gutronix.de>,
        Marek Vasut <marex@...x.de>,
        Markus Niebel <Markus.Niebel@...tq-group.com>,
        Michael Turquette <mturquette@...libre.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: [RFC PATCH 10/11] arm64: dts: imx8mn: add dumy clock

The dummy clock was the only fixed rate clock not initialized from the
device tree. So let's add it to the device tree like we did for the
others fixed rate clocks.

This is a preparation patch for the upcoming support to setup all the
clocks directly from the device tree.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 arch/arm64/boot/dts/freescale/imx8mn.dtsi | 11 +++++++++--
 drivers/clk/imx/clk-imx8mn.c              |  2 +-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index b7d91df71cc2..1949db3e08f7 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -217,6 +217,13 @@ clk_ext4: clock-ext4 {
 		clock-output-names = "clk_ext4";
 	};
 
+	clk_dummy: clock-dummy {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <0>;
+		clock-output-names = "dummy";
+	};
+
 	pmu {
 		compatible = "arm,cortex-a53-pmu";
 		interrupts = <GIC_PPI 7
@@ -614,9 +621,9 @@ clk: clock-controller@...80000 {
 				reg = <0x30380000 0x10000>;
 				#clock-cells = <1>;
 				clocks = <&osc_32k>, <&osc_24m>, <&clk_ext1>, <&clk_ext2>,
-					 <&clk_ext3>, <&clk_ext4>;
+					 <&clk_ext3>, <&clk_ext4>, <&clk_dummy>;
 				clock-names = "osc_32k", "osc_24m", "clk_ext1", "clk_ext2",
-					      "clk_ext3", "clk_ext4";
+					      "clk_ext3", "clk_ext4", "dummy";
 				assigned-clocks = <&clk IMX8MN_CLK_A53_SRC>,
 						<&clk IMX8MN_CLK_A53_CORE>,
 						<&clk IMX8MN_CLK_NOC>,
diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
index af256ade554f..e1f059dc5afa 100644
--- a/drivers/clk/imx/clk-imx8mn.c
+++ b/drivers/clk/imx/clk-imx8mn.c
@@ -331,7 +331,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 	clk_hw_data->num = IMX8MN_CLK_END;
 	hws = clk_hw_data->hws;
 
-	hws[IMX8MN_CLK_DUMMY] = imx_clk_hw_fixed("dummy", 0);
+	hws[IMX8MN_CLK_DUMMY] = imx_get_clk_hw_by_name(np, "dummy");
 	hws[IMX8MN_CLK_24M] = imx_get_clk_hw_by_name(np, "osc_24m");
 	hws[IMX8MN_CLK_32K] = imx_get_clk_hw_by_name(np, "osc_32k");
 	hws[IMX8MN_CLK_EXT1] = imx_get_clk_hw_by_name(np, "clk_ext1");
-- 
2.32.0