openwrt/target/linux/ipq806x/patches-6.1/122-01-clk-qcom-krait-cc-handle-qsb-clock-defined-in-DTS.patch

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From 666c1b745e93ccddde841d5057c33f97b29a316a Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 15 Sep 2022 02:19:28 +0200
Subject: [PATCH 3/9] clk: qcom: krait-cc: handle qsb clock defined in DTS
qsb fixed clk may be defined in DTS and correctly passed in the clocks
list. Add related code to handle this and modify the logic to
dynamically read qsb clock frequency.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/clk/qcom/krait-cc.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/qcom/krait-cc.c b/drivers/clk/qcom/krait-cc.c
index 84f0048961f5..f1d64b16cac3 100644
--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -305,7 +305,7 @@ static int krait_cc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct of_device_id *id;
- unsigned long cur_rate, aux_rate;
+ unsigned long cur_rate, aux_rate, qsb_rate;
int cpu;
struct clk *clk;
struct clk **clks;
@@ -315,11 +315,19 @@ static int krait_cc_probe(struct platform_device *pdev)
if (!id)
return -ENODEV;
- /* Rate is 1 because 0 causes problems for __clk_mux_determine_rate */
- clk = clk_register_fixed_rate(dev, "qsb", NULL, 0, 1);
+ /*
+ * Per Documentation qsb should be provided from DTS.
+ * To address old implementation, register the fixed clock anyway.
+ * Rate is 1 because 0 causes problems for __clk_mux_determine_rate
+ */
+ clk = clk_get(dev, "qsb");
+ if (IS_ERR(clk))
+ clk = clk_register_fixed_rate(dev, "qsb", NULL, 0, 1);
if (IS_ERR(clk))
return PTR_ERR(clk);
+ qsb_rate = clk_get_rate(clk);
+
if (!id->data) {
clk = clk_register_fixed_factor(dev, "acpu_aux",
"gpll0_vote", 0, 1, 2);
--
2.37.2