From: Stephen Boyd <sboyd@kernel.org>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Chen-Yu Tsai <wenst@chromium.org>
Cc: Michael Turquette <mturquette@baylibre.com>,
Chun-Jie Chen <chun-jie.chen@mediatek.com>,
Miles Chen <miles.chen@mediatek.com>,
Rex-BC Chen <rex-bc.chen@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-clk@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/7] clk: mediatek: Move to struct clk_hw provider APIs
Date: Thu, 21 Apr 2022 18:40:42 -0700 [thread overview]
Message-ID: <20220422014044.16530C385A7@smtp.kernel.org> (raw)
In-Reply-To: <CAGXv+5G2Uyq5fdMUnhr5wOm6O8M3dHNKGaSP2L_Vv1o28mXmOQ@mail.gmail.com>
Quoting Chen-Yu Tsai (2022-04-20 23:05:10)
>
> Not exactly. All the clocks in the MTK drivers are allocated at runtime,
> so we can't use clk_parent_data to point to not-yet-allocated clk_hw-s.
> Instead we'll need to have
>
> struct mtk_clk_parent_data {
> unsigned int clk_id; /* Match CLK_XXX_YYY from dt-binding headers */
> ... /* remaining fields same as mtk_clk_parent_data */
> };
>
> and create the actual clk_parent_data at runtime by looking up clk_id in
> the set of already registered clks:
>
> int mtk_clk_register_XXX(..., struct mtk_clk_parent_data *pdata,
> struct clk_hw_onecell_data *clk_data) {
> struct clk_parent_data data = {
> .hw = clk_data[pdata->clk_id],
> /* copy other fields verbatim */
> };
> ...
> }
>
> Obviously this forces some ordering of how the clks are registered.
> I believe the order is already correct, and if it isn't, it would be
> easy to detect, and we can reorder things to fix it.
If this is a common problem, we may need to come up with a generic
solution that either adds a new clk registration API that fills in the
clk_parent_data hw pointer or add another member to struct
clk_parent_data that says "index into this other array of clk_hw
pointers".
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next prev parent reply other threads:[~2022-04-22 1:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-19 8:12 [RFC PATCH 0/7] clk: mediatek: Move to struct clk_hw provider APIs Chen-Yu Tsai
2022-04-19 8:12 ` [RFC PATCH 1/7] clk: mediatek: Make mtk_clk_register_composite() static Chen-Yu Tsai
2022-04-19 14:45 ` AngeloGioacchino Del Regno
2022-04-19 8:12 ` [RFC PATCH 2/7] clk: mediatek: apmixed: Drop error message from clk_register() failure Chen-Yu Tsai
2022-04-19 8:12 ` [RFC PATCH 3/7] clk: mediatek: Convert mtk_{alloc, free}_clk_data to struct clk_hw Chen-Yu Tsai
2022-04-19 8:12 ` [RFC PATCH 5/7] clk: mediatek: Switch to clk_hw provider APIs Chen-Yu Tsai
2022-04-19 8:12 ` [RFC PATCH 6/7] clk: mediatek: mt8173: Fix usage of mtk_clk_register_ref2usb_tx() Chen-Yu Tsai
2022-04-19 8:12 ` [RFC PATCH 7/7] clk: mediatek: mt8173: Switch to clk_hw provider APIs Chen-Yu Tsai
2022-04-19 15:08 ` [RFC PATCH 0/7] clk: mediatek: Move to struct " AngeloGioacchino Del Regno
2022-04-19 16:09 ` Chen-Yu Tsai
2022-04-20 12:02 ` AngeloGioacchino Del Regno
2022-04-21 6:05 ` Chen-Yu Tsai
2022-04-21 9:42 ` AngeloGioacchino Del Regno
2022-04-22 1:40 ` Stephen Boyd [this message]
2022-04-22 4:14 ` Chen-Yu Tsai
2022-05-03 16:28 ` Chen-Yu Tsai
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