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From: Dong Aisheng <aisheng.dong@nxp.com>
To: linux-clk@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org, sboyd@kernel.org,
	mturquette@baylibre.com, shawnguo@kernel.org,
	fabio.estevam@nxp.com, linux-imx@nxp.com, kernel@pengutronix.de,
	Dong Aisheng <aisheng.dong@nxp.com>,
	devicetree@vger.kernel.org
Subject: [PATCH v7 01/11] dt-bindings: firmware: imx-scu: new binding to parse clocks from device tree
Date: Wed, 29 Jul 2020 16:00:08 +0800
Message-ID: <1596009618-25516-2-git-send-email-aisheng.dong@nxp.com> (raw)
In-Reply-To: <1596009618-25516-1-git-send-email-aisheng.dong@nxp.com>

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 <kernel@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: devicetree@vger.kernel.org
Acked-by: Shawn Guo <shawnguo@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
ChangeLog:
v6->v7:
 * dropped SC PM clk definitions which already upstreamed by another patch
v4->v6:
 * no changes
v3->v4:
 * add some comments for various clock types
v2->v3:
 * Changed to two cells binding and register all clocks in driver
   instead of parse from device tree.
v1->v2:
 * changed to one cell binding inspired by arm,scpi.txt
   Documentation/devicetree/bindings/arm/arm,scpi.txt
   Resource ID is encoded in 'reg' property.
   Clock type is encoded in generic clock-indices property.
   Then we don't have to search all the DT nodes to fetch
   those two value to construct clocks which is relatively
   low efficiency.
 * Add required power-domain property as well.
---
 .../devicetree/bindings/arm/freescale/fsl,scu.txt    | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index 715047444391..d341285d9a58 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>;
 };
-- 
2.23.0


  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29  8:00 [PATCH v7 00/11] clk: imx8: add new clock binding for better pm support Dong Aisheng
2020-07-29  8:00 ` Dong Aisheng [this message]
2020-07-29  8:00 ` [PATCH v7 02/11] dt-bindings: clock: imx-lpcg: add support to parse clocks from device tree Dong Aisheng
2020-07-29  8:06   ` Dong Aisheng
2020-07-31 21:28   ` Rob Herring
2020-07-29  8:00 ` [PATCH v7 03/11] clk: imx: scu: add two cells binding support Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 04/11] clk: imx: scu: bypass cpu power domains Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 05/11] clk: imx: scu: allow scu clk to take device pointer Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 06/11] clk: imx: scu: add runtime pm support Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 07/11] clk: imx: scu: add suspend/resume support Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 08/11] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 09/11] clk: imx: lpcg: allow lpcg clk to take device pointer Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 10/11] clk: imx: clk-imx8qxp-lpcg: add runtime pm support Dong Aisheng
2020-07-29  8:00 ` [PATCH v7 11/11] clk: imx: lpcg: add suspend/resume support Dong Aisheng
2020-07-29  8:04 ` [PATCH v7 00/11] clk: imx8: add new clock binding for better pm support Dong Aisheng
2020-08-17  7:42   ` Dong Aisheng
2020-09-02  6:35     ` Dong Aisheng

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