From 02f5bea93cdc4f1c7e37a2347ee18053c1af8cf2 Mon Sep 17 00:00:00 2001 From: Dong Aisheng Date: Wed, 29 Jul 2020 16:00:08 +0800 Subject: dt-bindings: firmware: imx-scu: new binding to parse clocks from device tree There's a few limitations on the original one cell clock binding (#clock-cells = <1>) that we have to define some SW clock IDs for device tree to reference. This may cause troubles if we want to use common clock IDs for multi platforms support when the clock of those platforms are mostly the same. e.g. Current clock IDs name are defined with SS prefix. However the device may reside in different SS across CPUs, that means the SS prefix may not valid anymore for a new SoC. Furthermore, the device availability of those clocks may also vary a bit. For such situation, we want to eliminate the using of SW Clock IDs and change to use a more close to HW one instead. For SCU clocks usage, only two params required: Resource id + Clock Type. Both parameters are platform independent. So we could use two cells binding to pass those parameters, Cc: Sascha Hauer Cc: Michael Turquette Cc: devicetree@vger.kernel.org Acked-by: Shawn Guo Reviewed-by: Rob Herring Reviewed-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Shawn Guo --- Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt') diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt index 6064d98b1031..395359dc94fd 100644 --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt @@ -89,7 +89,10 @@ Required properties: "fsl,imx8qm-clock" "fsl,imx8qxp-clock" followed by "fsl,scu-clk" -- #clock-cells: Should be 1. Contains the Clock ID value. +- #clock-cells: Should be either + 2: Contains the Resource and Clock ID value. + or + 1: Contains the Clock ID value. (DEPRECATED) - clocks: List of clock specifiers, must contain an entry for each required entry in clock-names - clock-names: Should include entries "xtal_32KHz", "xtal_24MHz" @@ -208,7 +211,7 @@ firmware { clk: clk { compatible = "fsl,imx8qxp-clk", "fsl,scu-clk"; - #clock-cells = <1>; + #clock-cells = <2>; }; iomuxc { @@ -263,8 +266,7 @@ serial@5a060000 { ... pinctrl-names = "default"; pinctrl-0 = <&pinctrl_lpuart0>; - clocks = <&clk IMX8QXP_UART0_CLK>, - <&clk IMX8QXP_UART0_IPG_CLK>; - clock-names = "per", "ipg"; + clocks = <&uart0_clk IMX_SC_R_UART_0 IMX_SC_PM_CLK_PER>; + clock-names = "ipg"; power-domains = <&pd IMX_SC_R_UART_0>; }; -- cgit v1.2.3-59-g8ed1b