linux-kernel - Re: [PATCH v3 0/5] provide the XTAL clock via OF on Meson8/8b/8m2

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Date:   Mon, 18 Nov 2019 10:55:47 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        narmstrong@...libre.com, linux-amlogic@...ts.infradead.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/5] provide the XTAL clock via OF on Meson8/8b/8m2


On Sun 17 Nov 2019 at 14:59, Martin Blumenstingl <martin.blumenstingl@...glemail.com> wrote:

> So far the HHI clock controller has been providing the XTAL clock on
> Amlogic Meson8/Meson8b/Meson8m2 SoCs.
> This is not correct because the XTAL is actually a crystal on the
> boards and the SoC has a dedicated input for it.
>
> This updates the dt-bindings of the HHI clock controller and defines
> a fixed-clock in meson.dtsi (along with switching everything over to
> use this clock).
> The clock driver needs three updates to use this:
> - patch #2 uses clk_hw_set_parent in the CPU clock notifier. This drops
>   the explicit reference to CLKID_XTAL while at the same time making
>   the code much easier (thanks to Neil for providing this new method
>   as part of the G12A CPU clock bringup!)
> - patch #3 ensures that the clock driver doesn't rely on it's internal
>   XTAL clock while not losing support for older .dtbs that don't have
>   the XTAL clock input yet
> - with patch #4 the clock controller's own XTAL clock is not registered
>   anymore when a clock input is provided via OF
>
> This series is a functional no-op. It's main goal is to better represent
> how the actual hardware looks like.
>
>
> Changes since v2 at [1]:
> - add .fw_name in addition to .name in patch #3 as suggested by Jerome
> - dropped the dts patch so this whole series targets clk-meson
> - moved patch #5 from another series to this one because once we drop
>   .name = "xtal" the clocks need to be aware of the OF node
>
> Changes since v1 at [0]:
> - add Rob's Reviewed-by to the dt-bindings patch
> - check that "xtal" clock is actually passed via OF instead of checking
>   that there's any parent at all (which in the worst case may not be the
>   xtal clock) as suggested by Jerome
>   
>
> [0] https://patchwork.kernel.org/cover/11155515/
> [1] https://patchwork.kernel.org/cover/11214189/
>
>
> Martin Blumenstingl (5):
>   dt-bindings: clock: meson8b: add the clock inputs
>   clk: meson: meson8b: use clk_hw_set_parent in the CPU clock notifier
>   clk: meson: meson8b: change references to the XTAL clock to use
>     [fw_]name
>   clk: meson: meson8b: don't register the XTAL clock when provided via
>     OF
>   clk: meson: meson8b: use of_clk_hw_register to register the clocks
>
>  .../bindings/clock/amlogic,meson8b-clkc.txt   |   5 +
>  drivers/clk/meson/meson8b.c                   | 113 ++++++++++--------
>  2 files changed, 67 insertions(+), 51 deletions(-)

Applied for v5.6
Please note this will get rebased once v5.5-rc1 is out