Re: [PATCH v2 2/5] ARM64: dts: meson-axg: uart: drop legacy compatible name from EE UART

[Jerome Brunet]

On Sat, 2018-01-06 at 08:10 +0800, Yixun Lan wrote:
> When update the clock info for the UART controller in the EE domain,
> the driver explicitly require 'pclk' in order to work properly.
> 
> With current logic of the code, the driver will go for the legacy clock probe
> routine[1] if it find current compatible string match to 'amlogic,meson-uart',
> which result in not requesting the 'pclk' clock, thus break the driver in the 
> end.
> 
> [1] drivers/tty/serial/meson_uart.c:685
> 
> /* Use legacy way until all platforms switch to new bindings */
> if (of_device_is_compatible(pdev->dev.of_node, "amlogic,meson-uart"))
> ret = meson_uart_probe_clocks_legacy(pdev, port);
> else
> ret = meson_uart_probe_clocks(pdev, port);

I don't think you should add this code snip here. Anybody can look at the driver
code to see that

> 
> Acked-by: Jerome Brunet 
> Signed-off-by: Yixun Lan 

[PATCH v2 2/5] ARM64: dts: meson-axg: uart: drop legacy compatible name from EE UART

[Yixun Lan]

When update the clock info for the UART controller in the EE domain,
the driver explicitly require 'pclk' in order to work properly.

With current logic of the code, the driver will go for the legacy clock probe
routine[1] if it find current compatible string match to 'amlogic,meson-uart',
which result in not requesting the 'pclk' clock, thus break the driver in the 
end.

[1] drivers/tty/serial/meson_uart.c:685

/* Use legacy way until all platforms switch to new bindings */
if (of_device_is_compatible(pdev->dev.of_node, "amlogic,meson-uart"))
ret = meson_uart_probe_clocks_legacy(pdev, port);
else
ret = meson_uart_probe_clocks(pdev, port);

Acked-by: Jerome Brunet 
Signed-off-by: Yixun Lan 
---
 arch/arm64/boot/dts/amlogic/meson-axg.dtsi | 8 ++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi 
b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
index 70c776ef7aa7..644d0f9eaf8c 100644
--- a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
@@ -164,17 +164,21 @@
};
 
uart_A: serial@24000 {
-   compatible = "amlogic,meson-gx-uart", 
"amlogic,meson-uart";
+   compatible = "amlogic,meson-gx-uart";
reg = <0x0 0x24000 0x0 0x18>;
interrupts = ;
status = "disabled";
+   clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
+   clock-names = "xtal", "pclk", "baud";
};
 
uart_B: serial@23000 {
-   compatible = "amlogic,meson-gx-uart", 
"amlogic,meson-uart";
+   compatible = "amlogic,meson-gx-uart";
reg = <0x0 0x23000 0x0 0x18>;
interrupts = ;
status = "disabled";
+   clocks = <&xtal>, <&clkc CLKID_UART1>, <&xtal>;
+   clock-names = "xtal", "pclk", "baud";
};
};
 
-- 
2.15.1