linux-kernel - [PATCH v3 3/6] clk: qcom: common: add qcom_find_freq

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Date:   Tue, 17 Jan 2023 14:54:56 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Christian Marangi <ansuelsmth@...il.com>
Subject: [PATCH v3 3/6] clk: qcom: common: add qcom_find_freq_exact

Currently qcom_find_freq will always find a freq following a CEIL logic
but we may need to find the exact requesting frequency or return NULL.

Add qcom_find_freq_exact to perform a search of the exact requested
frequency.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/clk/qcom/common.c | 17 +++++++++++++++++
 drivers/clk/qcom/common.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index 75f09e6e057e..ffa91bcc0b0a 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -57,6 +57,23 @@ const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
 }
 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
 
+const
+struct freq_tbl *qcom_find_freq_exact(const struct freq_tbl *f, unsigned long rate)
+{
+	if (!f)
+		return NULL;
+
+	if (!f->freq)
+		return f;
+
+	for (; f->freq; f++)
+		if (rate == f->freq)
+			return f;
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(qcom_find_freq_exact);
+
 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
 {
 	int i, num_parents = clk_hw_get_num_parents(hw);
diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h
index 9c8f7b798d9f..7bd935332634 100644
--- a/drivers/clk/qcom/common.h
+++ b/drivers/clk/qcom/common.h
@@ -45,6 +45,8 @@ extern const struct freq_tbl *qcom_find_freq(const struct freq_tbl *f,
 					     unsigned long rate);
 extern const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
 						   unsigned long rate);
+extern const struct freq_tbl *qcom_find_freq_exact(const struct freq_tbl *f,
+						   unsigned long rate);
 extern void
 qcom_pll_set_fsm_mode(struct regmap *m, u32 reg, u8 bias_count, u8 lock_count);
 extern int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map,
-- 
2.38.1