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

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Date:   Mon, 08 Jan 2018 09:56:42 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Yixun Lan <yixun.lan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>, devicetree@...r.kernel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Carlo Caione <carlo@...one.org>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] ARM64: dts: meson-axg: uart: drop legacy
 compatible name from EE UART

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 <jbrunet@...libre.com>
> Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>