74 lines
2.5 KiB
Diff
74 lines
2.5 KiB
Diff
From 7023dd1743aa6bb305fdce96e6e80eecc6e01f16 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Sat, 2 Apr 2022 14:49:56 +0200
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Subject: [PATCH] clk: Introduce clk_hw_init_rate_request()
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Some drivers (at91, imx, qcom) use __clk_determine_rate directly, and
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thus will need to initialise a clk_rate_request structure.
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However, drivers don't have access to the function that the core uses to
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initialize that structure which could prove to be useful.
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Let's create a function for clock providers that will initialize a
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clk_rate_request for a given clk_hw pointer and a rate.
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Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
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Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/clk/clk.c | 20 ++++++++++++++++++++
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include/linux/clk-provider.h | 6 ++++++
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2 files changed, 26 insertions(+)
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--- a/drivers/clk/clk.c
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+++ b/drivers/clk/clk.c
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@@ -1394,6 +1394,26 @@ static void clk_core_init_rate_req(struc
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}
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}
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+/**
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+ * clk_hw_init_rate_request - Initializes a clk_rate_request
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+ * @hw: the clk for which we want to submit a rate request
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+ * @req: the clk_rate_request structure we want to initialise
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+ * @rate: the rate which is to be requested
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+ *
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+ * Initializes and fills a clk_rate_request structure to submit to
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+ * __clk_determine_rate or similar functions.
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+ */
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+void clk_hw_init_rate_request(struct clk_hw * const hw,
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+ struct clk_rate_request *req,
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+ unsigned long rate)
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+{
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+ if (WARN_ON(!hw || !req))
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+ return;
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+
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+ clk_core_init_rate_req(hw->core, req, rate);
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+}
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+EXPORT_SYMBOL_GPL(clk_hw_init_rate_request);
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+
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static bool clk_core_can_round(struct clk_core * const core)
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{
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return core->ops->determine_rate || core->ops->round_rate;
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--- a/include/linux/clk-provider.h
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+++ b/include/linux/clk-provider.h
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@@ -42,6 +42,8 @@ struct dentry;
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* struct clk_rate_request - Structure encoding the clk constraints that
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* a clock user might require.
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*
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+ * Should be initialized by calling clk_hw_init_rate_request().
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+ *
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* @rate: Requested clock rate. This field will be adjusted by
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* clock drivers according to hardware capabilities.
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* @min_rate: Minimum rate imposed by clk users.
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@@ -60,6 +62,10 @@ struct clk_rate_request {
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struct clk_hw *best_parent_hw;
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};
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+void clk_hw_init_rate_request(struct clk_hw * const hw,
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+ struct clk_rate_request *req,
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+ unsigned long rate);
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+
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/**
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* struct clk_duty - Struture encoding the duty cycle ratio of a clock
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*
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