linux-kernel - [PATCH v2 3/6] dmaengine: axi-dmac: move clock enable earlier

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Message-ID: <20200825124840.43664-11-alexandru.ardelean@analog.com>
Date:   Tue, 25 Aug 2020 15:48:37 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <vkoul@...nel.org>, <lars@...afoo.de>, <dan.j.williams@...el.com>,
        <ardeleanalex@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 3/6] dmaengine: axi-dmac: move clock enable earlier

The clock may also be required to read registers from the IP core (if it is
provided and the driver needs to control it).
So, move it earlier in the probe.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/dma/dma-axi-dmac.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 90a99bdffa2b..f4b17b5e3914 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -850,16 +850,23 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	if (IS_ERR(dmac->clk))
 		return PTR_ERR(dmac->clk);
 
+	ret = clk_prepare_enable(dmac->clk);
+	if (ret < 0)
+		return ret;
+
 	of_channels = of_get_child_by_name(pdev->dev.of_node, "adi,channels");
-	if (of_channels == NULL)
-		return -ENODEV;
+	if (of_channels == NULL) {
+		ret = -ENODEV;
+		goto err_clk_disable;
+	}
 
 	for_each_child_of_node(of_channels, of_chan) {
 		ret = axi_dmac_parse_chan_dt(of_chan, &dmac->chan);
 		if (ret) {
 			of_node_put(of_chan);
 			of_node_put(of_channels);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto err_clk_disable;
 		}
 	}
 	of_node_put(of_channels);
@@ -892,10 +899,6 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	dmac->chan.vchan.desc_free = axi_dmac_desc_free;
 	vchan_init(&dmac->chan.vchan, dma_dev);
 
-	ret = clk_prepare_enable(dmac->clk);
-	if (ret < 0)
-		return ret;
-
 	version = axi_dmac_read(dmac, ADI_AXI_REG_VERSION);
 
 	ret = axi_dmac_detect_caps(dmac, version);
-- 
2.17.1