[PATCH v3 02/15] clk: add clk_determine_rate_noop()

Tue, 05 May 2026 17:50:45 -0700 

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 <[email protected]>
---
To: Michael Turquette <[email protected]>
To: Stephen Boyd <[email protected]>
To: Brian Masney <[email protected]>
To: Abel Vesa <[email protected]>
To: Peng Fan <[email protected]>
To: Frank Li <[email protected]>
To: Sascha Hauer <[email protected]>
To: Pengutronix Kernel Team <[email protected]>
To: Fabio Estevam <[email protected]>
To: Anson Huang <[email protected]>
To: Bjorn Andersson <[email protected]>
To: Geert Uytterhoeven <[email protected]>
To: Andrea della Porta <[email protected]>
To: Tudor Ambarus <[email protected]>
To: Krzysztof Kozlowski <[email protected]>
To: Sylwester Nawrocki <[email protected]>
To: Chanwoo Choi <[email protected]>
To: Alim Akhtar <[email protected]>
To: Sudeep Holla <[email protected]>
To: Cristian Marussi <[email protected]>
To: Orson Zhai <[email protected]>
To: Baolin Wang <[email protected]>
To: Chunyan Zhang <[email protected]>
To: Chun-Kuang Hu <[email protected]>
To: Philipp Zabel <[email protected]>
To: Chunfeng Yun <[email protected]>
To: Vinod Koul <[email protected]>
To: Neil Armstrong <[email protected]>
To: Matthias Brugger <[email protected]>
To: AngeloGioacchino Del Regno <[email protected]>
To: Ulf Hansson <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
 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

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