linux-kernel - Re: [PATCH v5.1 1/2] ARM64: dts: meson-gx: use stable UART bindings with correct gate clock

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Date:   Sun, 3 Dec 2017 15:15:34 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     Neil Armstrong <narmstrong@...libre.com>, khilman@...libre.com,
        Helmut Klein <hgkr.klein@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v5.1 1/2] ARM64: dts: meson-gx: use stable UART bindings
 with correct gate clock

Hi,

Am 21.06.2017 um 16:42 schrieb Neil Armstrong:
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> index 17d3efd..ea53cc2 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> @@ -682,6 +682,31 @@
>  	clocks = <&clkc CLKID_SPI>;
>  };
>  
> +&uart_A {
> +	clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
> +	clock-names = "xtal", "pclk", "baud";
> +};
> +
> +&uart_AO {
> +	clocks = <&xtal>, <&clkc CLKID_CLK81>, <&xtal>;
> +	clock-names = "xtal", "pclk", "baud";
> +};
> +
> +&uart_AO_B {
> +	clocks = <&xtal>, <&clkc CLKID_CLK81>, <&xtal>;
> +	clock-names = "xtal", "pclk", "baud";
> +};
> +
> +&uart_B {
> +	clocks = <&xtal>, <&clkc CLKID_UART1>, <&xtal>;
> +	clock-names = "xtal", "core", "baud";

Looking at the meson_uart driver, it only looks for a "pclk" clock,
never for "core", and the only unnamed clock used should be the first.

There is no bindings documentation for "core", so I assume this was an
oversight and should be "pclk" everywhere?

> +};
> +
> +&uart_C {
> +	clocks = <&xtal>, <&clkc CLKID_UART2>, <&xtal>;
> +	clock-names = "xtal", "core", "baud";
> +};

The issue I'm facing is that uart_C on NanoPi K2 is not working in
4.14.1. To my surprise it appears to be probing okay though.

Sadly just overwriting the clock-names property via overlay does not fix
my issue. Any ideas?

> +
>  &vpu {
>  	compatible = "amlogic,meson-gxbb-vpu", "amlogic,meson-gx-vpu";
>  };
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> index 8d4f316..9e67444 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> @@ -623,6 +623,31 @@
>  	clocks = <&clkc CLKID_SPI>;
>  };
>  
> +&uart_A {
> +	clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
> +	clock-names = "xtal", "core", "baud";

Same issue spotted here and below.

> +};
> +
> +&uart_AO {
> +	clocks = <&xtal>, <&clkc CLKID_CLK81>, <&xtal>;
> +	clock-names = "xtal", "pclk", "baud";
> +};
> +
> +&uart_AO_B {
> +	clocks = <&xtal>, <&clkc CLKID_CLK81>, <&xtal>;
> +	clock-names = "xtal", "pclk", "baud";
> +};
> +
> +&uart_B {
> +	clocks = <&xtal>, <&clkc CLKID_UART1>, <&xtal>;
> +	clock-names = "xtal", "core", "baud";
> +};
> +
> +&uart_C {
> +	clocks = <&xtal>, <&clkc CLKID_UART2>, <&xtal>;
> +	clock-names = "xtal", "core", "baud";
> +};
> +
>  &vpu {
>  	compatible = "amlogic,meson-gxl-vpu", "amlogic,meson-gx-vpu";
>  };

Regards,
Andreas

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