linux-kernel - Re: [PATCH v3 0/4] tty/serial: meson_uart: add support for core clock handling

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Message-ID: <m2lgrha433.fsf@baylibre.com>
Date:   Mon, 03 Apr 2017 08:44:16 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Helmut Klein <hgkr.klein@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/4] tty/serial: meson_uart: add support for core clock handling

Helmut Klein <hgkr.klein@...il.com> writes:

> To be able to use the three none AO uarts of the meson gx SoCs (uart_A,

s/none/non/

> uart_B & uart_C), the core clock has to be enabled (see chapter 22.3 of
> the public s905 data sheet).
> At least the u-boot of my s905 based media player (netxeon minimx-g)
> doesn't do this. so the driver must enable the clock.

FYI: even if a booloader enablesq clocks, it's important that the kernel
enable clocks that it uses so the kernel can be independent of any
bootloader.

> This patch set does:
> - exposes the UART clock ids to the dtb
> - adds documentation for the dt-bindings of meson_uart
> - adds the core clock handling to the driver
> - adds the core clock handling to meson-gxbb.dtsi and meson-gxl.dtsi
>
> The patchset is based on the branch "master" of the repository in [1]

The master branch in my tree just tracks mainline master branch.

To avoid conflicts with other on-going DT changes, the DT patches should
probably be based on top of my v4.12/dt64 branch.

Kevin