arm64: dts: salvator-x: Enable SCIF_CLK frequency and pins

Add and enable the external crystal for the SCIF_CLK and its pinctrl, to
be used by the Baud Rate Generator for External Clock (BRG) on (H)SCIF.

This increases the range and accuracy of supported baud rates:
  - SCIF:
      - Supports now 50, 230400, 460800, 500000, and 921600 bps,
      - Perfect match for standard 50-460800, and 9216000 bps.
  - HSCIF:
      - Supports now 50, 75, and 110 bps,
      - Perfect match for standard 50-460800, and 9216000 bps.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
index 9af1e3fdc468c76f7ddd0a4a9cd420026e2ebc8c..31ace9c1f79dc70ceb8bfda66e1b83ecad399527 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
+++ b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
@@ -93,6 +93,9 @@
 };
 
 &pfc {
+       pinctrl-0 = <&scif_clk_pins>;
+       pinctrl-names = "default";
+
        scif1_pins: scif1 {
                renesas,groups = "scif1_data_a", "scif1_ctrl";
                renesas,function = "scif1";
@@ -101,6 +104,10 @@
                renesas,groups = "scif2_data_a";
                renesas,function = "scif2";
        };
+       scif_clk_pins: scif_clk {
+               renesas,groups = "scif_clk_a";
+               renesas,function = "scif_clk";
+       };
 
        i2c2_pins: i2c2 {
                renesas,groups = "i2c2_a";
@@ -138,6 +145,11 @@
        status = "okay";
 };
 
+&scif_clk {
+       clock-frequency = <14745600>;
+       status = "okay";
+};
+
 &i2c2 {
        pinctrl-0 = <&i2c2_pins>;
        pinctrl-names = "default";