[PATCH 1/1] arm64: dts: freescale: imx8mm/imx8mq: mba8mx: Use PCIe clock generator

[Alexander Stein]

PCIe reference clock is provided by Renesas 9FGV0441. Reference this
instead of a fixed-clock.

Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
---
I've dropped Geert Uytterhoeven and Magnus Damm from get_maintainers.pl
output as they seem to be triggered by 'renesas' keyword only.

It's a bit unclear what the clock IMX8MQ_CLK_PCIEx_PHY is actually
about. I assume 'pcie_bus' is the reference clock for the PCIe
device while 'pcie_phy' is the reference clock for the RC. Both
are provided by the external clock generator.

 .../dts/freescale/imx8mm-tqma8mqml-mba8mx.dts | 14 +++++++----
 .../dts/freescale/imx8mq-tqma8mq-mba8mx.dts   | 23 +++++--------------
 arch/arm64/boot/dts/freescale/mba8mx.dtsi     | 19 ++++++++++-----
 3 files changed, 29 insertions(+), 27 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
index ea6e8b85169f7..01b632b220dc7 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts
@@ -5,6 +5,8 @@
 
 /dts-v1/;
 
+#include <dt-bindings/phy/phy-imx8-pcie.h>
+
 #include "imx8mm-tqma8mqml.dtsi"
 #include "mba8mx.dtsi"
 
@@ -74,19 +76,23 @@ expander2: gpio at 27 {
 };
 
 &pcie_phy {
-	clocks = <&pcie0_refclk>;
+	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
+	fsl,clkreq-unsupported;
+	clocks = <&pcieclk 2>;
+	clock-names = "ref";
 	status = "okay";
 };
 
+/* PCIe slot on X36 */
 &pcie0 {
 	reset-gpio = <&expander0 14 GPIO_ACTIVE_LOW>;
-	clocks = <&clk IMX8MM_CLK_PCIE1_ROOT>, <&pcie0_refclk>,
+	clocks = <&clk IMX8MM_CLK_PCIE1_ROOT>, <&pcieclk 3>,
 		 <&clk IMX8MM_CLK_PCIE1_AUX>;
 	assigned-clocks = <&clk IMX8MM_CLK_PCIE1_AUX>,
-				<&clk IMX8MM_CLK_PCIE1_CTRL>;
+			  <&clk IMX8MM_CLK_PCIE1_CTRL>;
 	assigned-clock-rates = <10000000>, <250000000>;
 	assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_50M>,
-				<&clk IMX8MM_SYS_PLL2_250M>;
+				 <&clk IMX8MM_SYS_PLL2_250M>;
 	status = "okay";
 };
 
diff --git a/arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts b/arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts
index b302daca4ce64..b2e17d4f335eb 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts
@@ -28,18 +28,6 @@ extcon_usbotg: extcon-usbotg0 {
 		id-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
 	};
 
-	pcie0_refclk: pcie0-refclk {
-		compatible = "fixed-clock";
-		#clock-cells = <0>;
-		clock-frequency = <100000000>;
-	};
-
-	pcie1_refclk: pcie1-refclk {
-		compatible = "fixed-clock";
-		#clock-cells = <0>;
-		clock-frequency = <100000000>;
-	};
-
 	reg_otg_vbus: regulator-otg-vbus {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -103,23 +91,24 @@ &led2 {
 	gpios = <&gpio3 16 GPIO_ACTIVE_HIGH>;
 };
 
+/* PCIe slot on X36 */
 &pcie0 {
 	reset-gpio = <&expander0 14 GPIO_ACTIVE_LOW>;
 	clocks = <&clk IMX8MQ_CLK_PCIE1_ROOT>,
-		 <&pcie0_refclk>,
-		 <&clk IMX8MQ_CLK_PCIE1_PHY>,
+		 <&pcieclk 3>,
+		 <&pcieclk 2>,
 		 <&clk IMX8MQ_CLK_PCIE1_AUX>;
 	status = "okay";
 };
 
 /*
- * miniPCIe, also usable for cards with USB. Therefore configure the reset as
+ * miniPCIe on X28, also usable for cards with USB. Therefore configure the reset as
  * static gpio hog.
  */
 &pcie1 {
 	clocks = <&clk IMX8MQ_CLK_PCIE2_ROOT>,
-		 <&pcie1_refclk>,
-		 <&clk IMX8MQ_CLK_PCIE2_PHY>,
+		 <&pcieclk 1>,
+		 <&pcieclk 0>,
 		 <&clk IMX8MQ_CLK_PCIE2_AUX>;
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/freescale/mba8mx.dtsi b/arch/arm64/boot/dts/freescale/mba8mx.dtsi
index e2bc53b8d39a8..c82af672d1834 100644
--- a/arch/arm64/boot/dts/freescale/mba8mx.dtsi
+++ b/arch/arm64/boot/dts/freescale/mba8mx.dtsi
@@ -29,6 +29,12 @@ chosen {
 		stdout-path = &uart3;
 	};
 
+	clk_xtal25: clk-xtal25 {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <25000000>;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 		pinctrl-names = "default";
@@ -100,12 +106,6 @@ panel_in_lvds: endpoint {
 		};
 	};
 
-	pcie0_refclk: pcie0-refclk {
-		compatible = "fixed-clock";
-		#clock-cells = <0>;
-		clock-frequency = <100000000>;
-	};
-
 	reg_12v: regulator-12v {
 		compatible = "regulator-fixed";
 		regulator-name = "MBA8MX_12V";
@@ -264,6 +264,13 @@ eeprom3: eeprom at 57 {
 		pagesize = <16>;
 		vcc-supply = <&reg_vcc_3v3>;
 	};
+
+	pcieclk: clk at 68 {
+		compatible = "renesas,9fgv0441";
+		reg = <0x68>;
+		clocks = <&clk_xtal25>;
+		#clock-cells = <1>;
+	};
 };
 
 &i2c3 {
-- 
2.34.1