Message ID | 20221018-clk-range-checks-fixes-v3-55-9a1358472d52@cerno.tech |
---|---|
State | New |
Headers |
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Tue, 4 Apr 2023 09:57:18 -0400 (EDT) From: Maxime Ripard <maxime@cerno.tech> Date: Tue, 04 Apr 2023 12:11:45 +0200 Subject: [PATCH v3 55/65] clk: imx: scu: Switch to determine_rate MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20221018-clk-range-checks-fixes-v3-55-9a1358472d52@cerno.tech> References: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> In-Reply-To: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> To: Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, =?utf-8?q?Andreas_F=C3=A4rber?= <afaerber@suse.de>, Manivannan Sadhasivam <mani@kernel.org>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Claudiu Beznea <claudiu.beznea@microchip.com>, Max Filippov <jcmvbkbc@gmail.com>, Charles Keepax <ckeepax@opensource.cirrus.com>, Richard Fitzgerald <rf@opensource.cirrus.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Luca Ceresoli <luca.ceresoli@bootlin.com>, David Lechner <david@lechnology.com>, Sekhar Nori <nsekhar@ti.com>, Abel Vesa <abelvesa@kernel.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Matthias Brugger <matthias.bgg@gmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Dinh Nguyen <dinguyen@kernel.org>, Peter De Schrijver <pdeschrijver@nvidia.com>, Prashant Gaikwad <pgaikwad@nvidia.com>, Thierry Reding <thierry.reding@gmail.com>, Jonathan Hunter <jonathanh@nvidia.com>, Ulf Hansson <ulf.hansson@linaro.org>, Linus Walleij <linus.walleij@linaro.org>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Vinod Koul <vkoul@kernel.org>, Kishon Vijay Abraham I <kishon@kernel.org>, Alessandro Zummo <a.zummo@towertech.it>, Chen-Yu Tsai <wens@csie.org>, Jernej Skrabec <jernej.skrabec@gmail.com>, Samuel Holland <samuel@sholland.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>, Paul Cercueil <paul@crapouillou.net>, Orson Zhai <orsonzhai@gmail.com>, Baolin Wang <baolin.wang@linux.alibaba.com>, Chunyan Zhang <zhang.lyra@gmail.com> Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, linux-arm-kernel@lists.infradead.org, linux-actions@lists.infradead.org, patches@opensource.cirrus.com, linux-stm32@st-md-mailman.stormreply.com, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-phy@lists.infradead.org, linux-rtc@vger.kernel.org, linux-sunxi@lists.linux.dev, alsa-devel@alsa-project.org, linux-mips@vger.kernel.org, Maxime Ripard <maxime@cerno.tech> X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; 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Series |
clk: Make determine_rate mandatory for muxes
|
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Commit Message
Maxime Ripard
April 4, 2023, 10:11 a.m. UTC
The iMX SCU clocks implements a mux with a set_parent hook, but doesn't
provide a determine_rate implementation.
This is a bit odd, since set_parent() is there to, as its name implies,
change the parent of a clock. However, the most likely candidate to
trigger that parent change is a call to clk_set_rate(), with
determine_rate() figuring out which parent is the best suited for a
given rate.
The other trigger would be a call to clk_set_parent(), but it's far less
used, and it doesn't look like there's any obvious user for that clock.
So, the set_parent hook is effectively unused, possibly because of an
oversight. However, it could also be an explicit decision by the
original author to avoid any reparenting but through an explicit call to
clk_set_parent().
The driver does implement round_rate() though, which means that we can
change the rate of the clock, but we will never get to change the
parent.
However, It's hard to tell whether it's been done on purpose or not.
Since we'll start mandating a determine_rate() implementation, let's
convert the round_rate() implementation to a determine_rate(), which
will also make the current behavior explicit. The round_rate()
implementation being shared with other clocks, it's not removed.
And if it was an oversight, the clock behaviour can be adjusted later
on.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/clk/imx/clk-scu.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c index 66e49fea5f8a..bbdc1b23f6f5 100644 --- a/drivers/clk/imx/clk-scu.c +++ b/drivers/clk/imx/clk-scu.c @@ -250,6 +250,23 @@ static unsigned long clk_scu_recalc_rate(struct clk_hw *hw, return le32_to_cpu(msg.data.resp.rate); } +/* + * clk_scu_determine_rate - Returns the closest rate for a SCU clock + * @hw: clock to round rate for + * @req: clock rate request + * + * Returns 0 on success, a negative error on failure + */ +static int clk_scu_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + /* + * Assume we support all the requested rate and let the SCU firmware + * to handle the left work + */ + return 0; +} + /* * clk_scu_round_rate - Round clock rate for a SCU clock * @hw: clock to round rate for @@ -425,7 +442,7 @@ static void clk_scu_unprepare(struct clk_hw *hw) static const struct clk_ops clk_scu_ops = { .recalc_rate = clk_scu_recalc_rate, - .round_rate = clk_scu_round_rate, + .determine_rate = clk_scu_determine_rate, .set_rate = clk_scu_set_rate, .get_parent = clk_scu_get_parent, .set_parent = clk_scu_set_parent,