linux-kernel - [PATCH v3 2/8] dmaengine: mmp_pdma: Add optional clock support

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: <20250714-working_dma_0701_v2-v3-2-8b0f5cd71595@riscstar.com>
Date: Mon, 14 Jul 2025 17:39:29 +0800
From: Guodong Xu <guodong@...cstar.com>
To: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Duje Mihanović <duje.mihanovic@...le.hr>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Alex Elder <elder@...cstar.com>, Vivian Wang <wangruikang@...as.ac.cn>, 
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, Guodong Xu <guodong@...cstar.com>
Subject: [PATCH v3 2/8] dmaengine: mmp_pdma: Add optional clock support

Add support for retrieving and enabling an optional clock during
mmp_pdma_probe().

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v3: No change.
v2: No change.
---
 drivers/dma/mmp_pdma.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index a95d31103d3063a1d11177a1a37b89ac2fd213e9..4a6dbf55823722d26cc69379d22aaa88fbe19313 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
+#include <linux/clk.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -1019,6 +1020,7 @@ static int mmp_pdma_probe(struct platform_device *op)
 {
 	struct mmp_pdma_device *pdev;
 	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
+	struct clk *clk;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1037,6 +1039,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(pdev->base))
 		return PTR_ERR(pdev->base);
 
+	clk = devm_clk_get_optional_enabled(pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",

-- 
2.43.0