[PATCH v2 16/18] rockchip: rk3399: Include uart related pinctrl nodes in TPL/SPL

[Jonas Karlman]

The initial serial console UART iomux is typically configured in
board_debug_uart_init() at TPL stage on Rockchip platform.

Later stages typically use pinctrl driver to configure iomux UART once
again based on the control FDT.

Include uart related pinctrl nodes in TPL/SPL control FDT to make it
possible for pinctrl driver to configure UART iomux at TPL/SPL stage.

Following debug log message may also be seen at U-Boot pre-reloc stage:

  ns16550_serial serial at ff1a0000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19

This can be resolved by including bootph prop for U-Bood pre-reloc
phase (bootph-some-ram or bootph-all). However, this has intentionally
been excluded due to including it unnecessarily slows down boot around
200-400 ms.

Also add the clock-frequency prop similar to what has been done for
other Rockchip SoCs.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
v2: New patch split from "Fix loading FIT from SD-card" patch
v2: Change to only include pinctrl nodes in TPL and SPL phase

Hopefully the clock-frequency prop can be used to help speed up boot in
a future patch series, loading the uart rate from clock driver currently
delays boot at i.e. U-Boot proper pre-reloc.
---
 arch/arm/dts/rk3399-puma-haikou-u-boot.dtsi | 16 ++++++++++++++++
 arch/arm/dts/rk3399-u-boot.dtsi             |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/arch/arm/dts/rk3399-puma-haikou-u-boot.dtsi b/arch/arm/dts/rk3399-puma-haikou-u-boot.dtsi
index 390cf24152a6..d1912a2ef6a9 100644
--- a/arch/arm/dts/rk3399-puma-haikou-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-puma-haikou-u-boot.dtsi
@@ -113,4 +113,20 @@
 
 &uart0 {
 	bootph-all;
+	clock-frequency = <24000000>;
+};
+
+&uart0_cts {
+	bootph-pre-sram;
+	bootph-pre-ram;
+};
+
+&uart0_rts {
+	bootph-pre-sram;
+	bootph-pre-ram;
+};
+
+&uart0_xfer {
+	bootph-pre-sram;
+	bootph-pre-ram;
 };
diff --git a/arch/arm/dts/rk3399-u-boot.dtsi b/arch/arm/dts/rk3399-u-boot.dtsi
index 9815dc53e8ed..b39fe39fa2b3 100644
--- a/arch/arm/dts/rk3399-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-u-boot.dtsi
@@ -136,6 +136,12 @@
 
 &uart2 {
 	bootph-all;
+	clock-frequency = <24000000>;
+};
+
+&uart2c_xfer {
+	bootph-pre-sram;
+	bootph-pre-ram;
 };
 
 &vopb {
-- 
2.43.2