linux-kernel - [PATCH v2 1/7] clk: qcom: clk-rcg2: add rcg2 mux ops

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Date:   Mon, 11 Jul 2022 23:06:28 +0200
From:   Robert Marko <robimarko@...il.com>
To:     bjorn.andersson@...aro.org, agross@...nel.org,
        konrad.dybcio@...ainline.org, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Christian Marangi <ansuelsmth@...il.com>,
        Robert Marko <robimarko@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v2 1/7] clk: qcom: clk-rcg2: add rcg2 mux ops

From: Christian Marangi <ansuelsmth@...il.com>

An RCG may act as a mux that switch between 2 parents.
This is the case on IPQ6018 and IPQ8074 where the APCS core clk that feeds
the CPU cluster clock just switches between XO and the PLL that feeds it.

Add the required ops to add support for this special configuration and use
the generic mux function to determine the rate.

This way we dont have to keep a essentially dummy frequency table to use
RCG2 as a mux.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
Signed-off-by: Robert Marko <robimarko@...il.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/clk/qcom/clk-rcg.h  | 1 +
 drivers/clk/qcom/clk-rcg2.c | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
index 012e745794fd..01581f4d2c39 100644
--- a/drivers/clk/qcom/clk-rcg.h
+++ b/drivers/clk/qcom/clk-rcg.h
@@ -167,6 +167,7 @@ struct clk_rcg2_gfx3d {
 
 extern const struct clk_ops clk_rcg2_ops;
 extern const struct clk_ops clk_rcg2_floor_ops;
+extern const struct clk_ops clk_rcg2_mux_closest_ops;
 extern const struct clk_ops clk_edp_pixel_ops;
 extern const struct clk_ops clk_byte_ops;
 extern const struct clk_ops clk_byte2_ops;
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 28019edd2a50..609c10f8d0d9 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -509,6 +509,13 @@ const struct clk_ops clk_rcg2_floor_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_rcg2_floor_ops);
 
+const struct clk_ops clk_rcg2_mux_closest_ops = {
+	.determine_rate = __clk_mux_determine_rate_closest,
+	.get_parent = clk_rcg2_get_parent,
+	.set_parent = clk_rcg2_set_parent,
+};
+EXPORT_SYMBOL_GPL(clk_rcg2_mux_closest_ops);
+
 struct frac_entry {
 	int num;
 	int den;
-- 
2.36.1