linux-kernel - [PATCH v4 5/7] clk: spacemit: make clocks optional

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250414191715.2264758-6-elder@riscstar.com>
Date: Mon, 14 Apr 2025 14:17:12 -0500
From: Alex Elder <elder@...cstar.com>
To: mturquette@...libre.com,
	sboyd@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: p.zabel@...gutronix.de,
	dlan@...too.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 v4 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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/spacemit/ccu-k1.c b/drivers/clk/spacemit/ccu-k1.c
index 09f101a52b1af..7494c97c3c7ec 100644
--- a/drivers/clk/spacemit/ccu-k1.c
+++ b/drivers/clk/spacemit/ccu-k1.c
@@ -1218,6 +1218,10 @@ static int spacemit_ccu_register(struct device *dev,
 	struct clk_hw_onecell_data *clk_data;
 	int i, ret;
 
+	/* Clocks are optional */
+	if (!data->clk_hws)
+		return 0;
+
 	clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, data->clk_num),
 				GFP_KERNEL);
 	if (!clk_data)
@@ -1329,6 +1333,7 @@ static int k1_ccu_probe(struct platform_device *pdev)
 	return 0;
 }
 
+/* Match data is required; its clk_hws or reset_data field must be non-null */
 static const struct of_device_id of_k1_ccu_match[] = {
 	{
 		.compatible	= "spacemit,k1-pll",
-- 
2.45.2