Message-Id: <20250811-clk-for-stephen-round-rate-v1-3-b3bf97b038dc@redhat.com>
Date: Mon, 11 Aug 2025 11:17:55 -0400
From: Brian Masney via B4 Relay <devnull+bmasney.redhat.com@...nel.org>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>, 
 Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...il.com>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Paul Cercueil <paul@...pouillou.net>, 
 Keguang Zhang <keguang.zhang@...il.com>, 
 Taichi Sugaya <sugaya.taichi@...ionext.com>, 
 Takao Orito <orito.takao@...ionext.com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Jacky Huang <ychuang3@...oton.com>, 
 Shan-Chun Hung <schung@...oton.com>, Vladimir Zapolskiy <vz@...ia.com>, 
 Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Samuel Holland <samuel.holland@...ive.com>, Yixun Lan <dlan@...too.org>, 
 Steen Hegelund <Steen.Hegelund@...rochip.com>, 
 Daniel Machon <daniel.machon@...rochip.com>, UNGLinuxDriver@...rochip.com, 
 Orson Zhai <orsonzhai@...il.com>, 
 Baolin Wang <baolin.wang@...ux.alibaba.com>, 
 Chunyan Zhang <zhang.lyra@...il.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Michal Simek <michal.simek@....com>, Maxime Ripard <mripard@...nel.org>, 
 Andreas Färber <afaerber@...e.de>, 
 Manivannan Sadhasivam <mani@...nel.org>, Sven Peter <sven@...nel.org>, 
 Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Neal Gompa <neal@...pa.dev>, Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Max Filippov <jcmvbkbc@...il.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Daniel Palmer <daniel@...ngy.jp>, Romain Perier <romain.perier@...il.com>, 
 Andrew Lunn <andrew@...n.ch>, Gregory Clement <gregory.clement@...tlin.com>, 
 Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Heiko Stuebner <heiko@...ech.de>, 
 Andrea della Porta <andrea.porta@...e.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Chanwoo Choi <cw00.choi@...sung.com>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Qin Jian <qinjian@...lus1.com>, Viresh Kumar <vireshk@...nel.org>, 
 Ulf Hansson <ulf.hansson@...aro.org>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Alex Helms <alexander.helms.jy@...esas.com>, 
 Linus Walleij <linus.walleij@...aro.org>, Liviu Dudau <liviu.dudau@....com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 sophgo@...ts.linux.dev, linux-mips@...r.kernel.org, imx@...ts.linux.dev, 
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev, 
 linux-stm32@...md-mailman.stormreply.com, patches@...nsource.cirrus.com, 
 linux-actions@...ts.infradead.org, asahi@...ts.linux.dev, 
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-renesas-soc@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, soc@...ts.linux.dev, 
 Brian Masney <bmasney@...hat.com>
Subject: [PATCH 003/114] clk: fixed-factor: add determine_rate() ops

From: Brian Masney <bmasney@...hat.com>

The round_rate() clk ops is deprecated, and determine_rate() should be
used instead. We can't just simply convert this driver over initially
since other drivers depend on this. So let's go ahead and add a
determine_rate() clk ops. Once all of the drivers have been converted,
then the round_rate() clk ops can be dropped.

Signed-off-by: Brian Masney <bmasney@...hat.com>
---
 drivers/clk/clk-fixed-factor.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index e62ae8794d445f685156276d5135448f340fca3f..79b9a8c57d4b84be990955d8bc3159b818f38d50 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -30,6 +30,23 @@ static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
 	return (unsigned long)rate;
 }
 
+static int clk_factor_determine_rate(struct clk_hw *hw,
+				     struct clk_rate_request *req)
+{
+	struct clk_fixed_factor *fix = to_clk_fixed_factor(hw);
+
+	if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
+		unsigned long best_parent;
+
+		best_parent = (req->rate / fix->mult) * fix->div;
+		req->best_parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent);
+	}
+
+	req->rate = (req->best_parent_rate / fix->div) * fix->mult;
+
+	return 0;
+}
+
 static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate,
 				unsigned long *prate)
 {
@@ -50,7 +67,7 @@ static int clk_factor_set_rate(struct clk_hw *hw, unsigned long rate,
 {
 	/*
 	 * We must report success but we can do so unconditionally because
-	 * clk_factor_round_rate returns values that ensure this call is a
+	 * clk_factor_determine_rate returns values that ensure this call is a
 	 * nop.
 	 */
 
@@ -69,6 +86,7 @@ static unsigned long clk_factor_recalc_accuracy(struct clk_hw *hw,
 }
 
 const struct clk_ops clk_fixed_factor_ops = {
+	.determine_rate = clk_factor_determine_rate,
 	.round_rate = clk_factor_round_rate,
 	.set_rate = clk_factor_set_rate,
 	.recalc_rate = clk_factor_recalc_rate,

-- 
2.50.1

Powered by blists - more mailing lists