From: Brian Masney <bmasney@redhat.com>
To: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
Brian Masney <bmasney@redhat.com>
Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
Abel Vesa <abelvesa@kernel.org>, Peng Fan <peng.fan@nxp.com>,
Frank Li <Frank.Li@nxp.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Anson Huang <anson.huang@nxp.com>,
Bjorn Andersson <andersson@kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Andrea della Porta <andrea.porta@suse.com>,
Tudor Ambarus <tudor.ambarus@linaro.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Sylwester Nawrocki <s.nawrocki@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Alim Akhtar <alim.akhtar@samsung.com>,
Sudeep Holla <sudeep.holla@kernel.org>,
Cristian Marussi <cristian.marussi@arm.com>,
Orson Zhai <orsonzhai@gmail.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Chun-Kuang Hu <chunkuang.hu@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
Vinod Koul <vkoul@kernel.org>,
Neil Armstrong <neil.armstrong@linaro.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Ulf Hansson <ulfh@kernel.org>,
imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org,
linux-renesas-soc@vger.kernel.org,
linux-samsung-soc@vger.kernel.org, arm-scmi@vger.kernel.org,
dri-devel@lists.freedesktop.org,
linux-mediatek@lists.infradead.org,
linux-phy@lists.infradead.org, linux-pm@vger.kernel.org
Subject: [PATCH v3 02/15] clk: add clk_determine_rate_noop()
Date: Tue, 05 May 2026 20:48:58 -0400 [thread overview]
Message-ID: <20260505-clk-determine-rate-noop-v3-2-f3f829fbacdf@redhat.com> (raw)
In-Reply-To: <20260505-clk-determine-rate-noop-v3-0-f3f829fbacdf@redhat.com>
Add a new helper clk_determine_rate_noop() that's for clocks where the
rate rounding is handled by the firmware/hardware, or the clock is
capable of any rate. The requested rate is passed through unchanged,
and the actual rate will be learned via recalc_rate() after the rate
is set.
This shared helper will be used to get rid of the driver-specific empty
determine rate implementations that are present in the tree.
Signed-off-by: Brian Masney <bmasney@redhat.com>
---
To: Michael Turquette <mturquette@baylibre.com>
To: Stephen Boyd <sboyd@kernel.org>
To: Brian Masney <bmasney@redhat.com>
To: Abel Vesa <abelvesa@kernel.org>
To: Peng Fan <peng.fan@nxp.com>
To: Frank Li <Frank.Li@nxp.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
To: Pengutronix Kernel Team <kernel@pengutronix.de>
To: Fabio Estevam <festevam@gmail.com>
To: Anson Huang <anson.huang@nxp.com>
To: Bjorn Andersson <andersson@kernel.org>
To: Geert Uytterhoeven <geert+renesas@glider.be>
To: Andrea della Porta <andrea.porta@suse.com>
To: Tudor Ambarus <tudor.ambarus@linaro.org>
To: Krzysztof Kozlowski <krzk@kernel.org>
To: Sylwester Nawrocki <s.nawrocki@samsung.com>
To: Chanwoo Choi <cw00.choi@samsung.com>
To: Alim Akhtar <alim.akhtar@samsung.com>
To: Sudeep Holla <sudeep.holla@kernel.org>
To: Cristian Marussi <cristian.marussi@arm.com>
To: Orson Zhai <orsonzhai@gmail.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Chunyan Zhang <zhang.lyra@gmail.com>
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>
To: Philipp Zabel <p.zabel@pengutronix.de>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Vinod Koul <vkoul@kernel.org>
To: Neil Armstrong <neil.armstrong@linaro.org>
To: Matthias Brugger <matthias.bgg@gmail.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Ulf Hansson <ulfh@kernel.org>
Cc: linux-clk@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: imx@lists.linux.dev
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: arm-scmi@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-phy@lists.infradead.org
Cc: linux-pm@vger.kernel.org
---
drivers/clk/clk.c | 18 ++++++++++++++++++
include/linux/clk-provider.h | 1 +
2 files changed, 19 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 048adfa86a5d..956e147f4d4e 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -882,6 +882,24 @@ int clk_hw_determine_rate_no_reparent(struct clk_hw *hw,
}
EXPORT_SYMBOL_GPL(clk_hw_determine_rate_no_reparent);
+/**
+ * clk_determine_rate_noop - clk_ops::determine_rate noop implementation
+ * @hw: clk to determine rate on
+ * @req: rate request
+ *
+ * Noop determine rate for clocks where the rate rounding is handled by the
+ * firmware/hardware, or the clock is capable of any rate. The requested rate is
+ * passed through unchanged, and the actual rate will be learned via
+ * recalc_rate() after the rate is set.
+ *
+ * Returns: 0 always
+ */
+int clk_determine_rate_noop(struct clk_hw *hw, struct clk_rate_request *req)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(clk_determine_rate_noop);
+
/*** clk api ***/
static void clk_core_rate_unprotect(struct clk_core *core)
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b01a38fef8cf..334b9211a157 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1431,6 +1431,7 @@ int clk_mux_determine_rate_flags(struct clk_hw *hw,
unsigned long flags);
int clk_hw_determine_rate_no_reparent(struct clk_hw *hw,
struct clk_rate_request *req);
+int clk_determine_rate_noop(struct clk_hw *hw, struct clk_rate_request *req);
void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);
void clk_hw_get_rate_range(struct clk_hw *hw, unsigned long *min_rate,
unsigned long *max_rate);
--
2.54.0
next prev parent reply other threads:[~2026-05-06 0:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-06 0:48 [PATCH v3 00/15] clk: introduce clk_determine_rate_noop() and update drivers to use it Brian Masney
2026-05-06 0:48 ` Brian Masney [this message]
2026-05-06 0:49 ` [PATCH v3 10/15] clk: samsung: acpm: use clk_determine_rate_noop() Brian Masney
2026-05-06 11:55 ` Tudor Ambarus
2026-05-06 13:47 ` Krzysztof Kozlowski
2026-05-06 14:34 ` Brian Masney
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