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88a404a2d1
Add a new microchipsw target aimed add supporting Microchip switch SoC-s. Start by supporting LAN969x SoC-s as the first subtarget. Signed-off-by: Robert Marko <robert.marko@sartura.hr>
82 lines
2.4 KiB
Diff
82 lines
2.4 KiB
Diff
From 92da9095958114aca94d7ab0c8fa76ee556d412d Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= <csokas.bence@prolan.hu>
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Date: Tue, 10 Jun 2025 10:22:53 +0200
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Subject: [PATCH 107/112] dmaengine: Add devm_dma_request_chan()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Expand the arsenal of devm functions for DMA devices, this time for
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requesting channels.
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Signed-off-by: Bence Csókás <csokas.bence@prolan.hu>
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Link: https://lore.kernel.org/r/20250610082256.400492-2-csokas.bence@prolan.hu
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Signed-off-by: Vinod Koul <vkoul@kernel.org>
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---
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drivers/dma/dmaengine.c | 30 ++++++++++++++++++++++++++++++
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include/linux/dmaengine.h | 7 +++++++
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2 files changed, 37 insertions(+)
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--- a/drivers/dma/dmaengine.c
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+++ b/drivers/dma/dmaengine.c
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@@ -926,6 +926,36 @@ void dma_release_channel(struct dma_chan
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}
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EXPORT_SYMBOL_GPL(dma_release_channel);
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+static void dmaenginem_release_channel(void *chan)
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+{
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+ dma_release_channel(chan);
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+}
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+
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+/**
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+ * devm_dma_request_chan - try to allocate an exclusive slave channel
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+ * @dev: pointer to client device structure
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+ * @name: slave channel name
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+ *
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+ * Returns pointer to appropriate DMA channel on success or an error pointer.
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+ *
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+ * The operation is managed and will be undone on driver detach.
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+ */
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+
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+struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
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+{
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+ struct dma_chan *chan = dma_request_chan(dev, name);
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+ int ret = 0;
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+
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+ if (!IS_ERR(chan))
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+ ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
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+
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+ if (ret)
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+ return ERR_PTR(ret);
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+
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+ return chan;
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+}
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+EXPORT_SYMBOL_GPL(devm_dma_request_chan);
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+
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/**
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* dmaengine_get - register interest in dma_channels
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*/
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--- a/include/linux/dmaengine.h
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+++ b/include/linux/dmaengine.h
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@@ -1521,6 +1521,7 @@ struct dma_chan *__dma_request_channel(c
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struct dma_chan *dma_request_chan(struct device *dev, const char *name);
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struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask);
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+struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name);
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void dma_release_channel(struct dma_chan *chan);
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int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps);
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@@ -1557,6 +1558,12 @@ static inline struct dma_chan *dma_reque
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{
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return ERR_PTR(-ENODEV);
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}
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+
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+static inline struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
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+{
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+ return ERR_PTR(-ENODEV);
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+}
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+
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static inline void dma_release_channel(struct dma_chan *chan)
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{
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}
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