[PATCH] clk: rockchip: rk3588: fix CLK_NR_CLKS usage

[Sascha Hauer]

barebox adoption of Linux commit 2dc66a5ab2c6:

|    clk: rockchip: rk3588: fix CLK_NR_CLKS usage
|
|    CLK_NR_CLKS is not part of the DT bindings and needs to be removed
|    from it, just like it recently happened for other platforms. This
|    takes care of it by introducing a new function identifying the
|    maximum used clock ID at runtime.
|
|    Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
|    Link: https://lore.kernel.org/r/20240126182919.48402-2-sebastian.reichel@collabora.com
|    Signed-off-by: Heiko Stuebner <heiko at sntech.de>

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/clk/rockchip/clk-rk3588.c |  5 ++++-
 drivers/clk/rockchip/clk.c        | 17 +++++++++++++++++
 drivers/clk/rockchip/clk.h        |  2 ++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/rockchip/clk-rk3588.c b/drivers/clk/rockchip/clk-rk3588.c
index 8b5c68debe..68565a188c 100644
--- a/drivers/clk/rockchip/clk-rk3588.c
+++ b/drivers/clk/rockchip/clk-rk3588.c
@@ -2451,15 +2451,18 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = {
 static void __init rk3588_clk_init(struct device_node *np)
 {
 	struct rockchip_clk_provider *ctx;
+	unsigned long clk_nr_clks;
 	void __iomem *reg_base;
 
+	clk_nr_clks = rockchip_clk_find_max_clk_id(rk3588_clk_branches,
+					ARRAY_SIZE(rk3588_clk_branches)) + 1;
 	reg_base = of_iomap(np, 0);
 	if (!reg_base) {
 		pr_err("%s: could not map cru region\n", __func__);
 		return;
 	}
 
-	ctx = rockchip_clk_init(np, reg_base, CLK_NR_CLKS);
+	ctx = rockchip_clk_init(np, reg_base, clk_nr_clks);
 	if (IS_ERR(ctx)) {
 		pr_err("%s: rockchip clk init failed\n", __func__);
 		return;
diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index aca107a45d..aedb02a8d3 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -395,6 +395,23 @@ void rockchip_clk_register_plls(struct rockchip_clk_provider *ctx,
 }
 EXPORT_SYMBOL_GPL(rockchip_clk_register_plls);
 
+unsigned long rockchip_clk_find_max_clk_id(struct rockchip_clk_branch *list,
+					   unsigned int nr_clk)
+{
+	unsigned long max = 0;
+	unsigned int idx;
+
+	for (idx = 0; idx < nr_clk; idx++, list++) {
+		if (list->id > max)
+			max = list->id;
+		if (list->child && list->child->id > max)
+			max = list->id;
+	}
+
+	return max;
+}
+EXPORT_SYMBOL_GPL(rockchip_clk_find_max_clk_id);
+
 void rockchip_clk_register_branches(struct rockchip_clk_provider *ctx,
 				    struct rockchip_clk_branch *list,
 				    unsigned int nr_clk)
diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
index df819c61f1..a451229326 100644
--- a/drivers/clk/rockchip/clk.h
+++ b/drivers/clk/rockchip/clk.h
@@ -888,6 +888,8 @@ void rockchip_clk_of_add_provider(struct device_node *np,
 				struct rockchip_clk_provider *ctx);
 void rockchip_clk_add_lookup(struct rockchip_clk_provider *ctx,
 			     struct clk *clk, unsigned int id);
+unsigned long rockchip_clk_find_max_clk_id(struct rockchip_clk_branch *list,
+					   unsigned int nr_clk);
 void rockchip_clk_register_branches(struct rockchip_clk_provider *ctx,
 				    struct rockchip_clk_branch *list,
 				    unsigned int nr_clk);
-- 
2.39.2