linux-kernel - [PATCH RESEND 5/7] clk: spacemit: make clocks optional

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Message-ID: <20250321151831.623575-6-elder@riscstar.com>
Date: Fri, 21 Mar 2025 10:18:28 -0500
From: Alex Elder <elder@...cstar.com>
To: p.zabel@...gutronix.de,
	mturquette@...libre.com,
	sboyd@...nel.org,
	dlan@...too.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	heylenay@....org,
	guodong@...cstar.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	spacemit@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH RESEND 5/7] clk: spacemit: make clocks optional

There are some syscon devices that support both clocks and resets,
but for now only their reset functionality is required.  Make
defining clocks optional for a SpacemiT CCU, though at least one
clock or at least one reset controller must be defined.

Signed-off-by: Alex Elder <elder@...cstar.com>
---
 drivers/clk/spacemit/ccu-k1.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/spacemit/ccu-k1.c b/drivers/clk/spacemit/ccu-k1.c
index be8abd27753cb..17e321c25959a 100644
--- a/drivers/clk/spacemit/ccu-k1.c
+++ b/drivers/clk/spacemit/ccu-k1.c
@@ -1830,6 +1830,10 @@ static int k1_ccu_register(struct device *dev, struct regmap *regmap,
 	const struct spacemit_ccu_clk *clk;
 	int i, ret, max_id = 0;
 
+	/* Clocks are optional */
+	if (!clks)
+		return 0;
+
 	for (clk = clks; clk->hw; clk++)
 		max_id = max(max_id, clk->id);
 
@@ -1903,7 +1907,7 @@ static int k1_ccu_probe(struct platform_device *pdev)
 	int ret;
 
 	data = of_device_get_match_data(dev);
-	if (!data)
+	if (!data || !(data->clk || data->rst_data))
 		return -EINVAL;
 
 	base_regmap = device_node_to_regmap(dev->of_node);
-- 
2.43.0