linux-kernel - Re: [PATCH 00/25] clk: sunxi-ng: clk parent rewrite part 1

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Date:   Mon, 20 May 2019 11:03:27 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/25] clk: sunxi-ng: clk parent rewrite part 1

On Mon, May 20, 2019 at 04:03:56PM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
>
> Hi everyone,
>
> This is series is the first part of a large series (I haven't done the
> rest) of patches to rewrite the clk parent relationship handling within
> the sunxi-ng clk driver. This is based on Stephen's recent work allowing
> clk drivers to specify clk parents using struct clk_hw * or parsing DT
> phandles in the clk node.
>
> This series can be split into a few major parts:
>
> 1) The first patch is a small fix for clk debugfs representation. This
>    was done before commit 1a079560b145 ("clk: Cache core in
>    clk_fetch_parent_index() without names") was posted, so it might or
>    might not be needed. Found this when checking my work using
>    clk_possible_parents.
>
> 2) A bunch of CLK_HW_INIT_* helper macros are added. These cover the
>    situations I encountered, or assume I will encounter, such as single
>    internal (struct clk_hw *) parent, single DT (struct clk_parent_data
>    .fw_name), multiple internal parents, and multiple mixed (internal +
>    DT) parents. A special variant for just an internal single parent is
>    added, CLK_HW_INIT_HWS, which lets the driver share the singular
>    list, instead of having the compiler create a compound literal every
>    time. It might even make sense to only keep this variant.
>
> 3) A bunch of CLK_FIXED_FACTOR_* helper macros are added. The rationale
>    is the same as the single parent CLK_HW_INIT_* helpers.
>
> 4) Bulk conversion of CLK_FIXED_FACTOR to use local parent references,
>    either struct clk_hw * or DT .fw_name types, whichever the hardware
>    requires.
>
> 5) The beginning of SUNXI_CCU_GATE conversion to local parent
>    references. This part is not done. They are included as justification
>    and examples for the shared list of clk parents case.

That series is pretty neat. As far as sunxi is concerned, you can add my
Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

> I realize this is going to be many patches every time I convert a clock
> type. Going forward would the people involved prefer I send out
> individual patches like this series, or squash them all together?

For bisection, I guess it would be good to keep the approach you've
had in this series. If this is really too much, I guess we can always
change oru mind later on.

Thanks!
Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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