linux-kernel - [PATCH v2 0/4] dmaengine: stm32-dma3: improvements and helper functions

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Message-ID: <20251121-dma3_improv-v2-0-76a207b13ea6@foss.st.com>
Date: Fri, 21 Nov 2025 14:36:55 +0100
From: Amelie Delaunay <amelie.delaunay@...s.st.com>
To: Vinod Koul <vkoul@...nel.org>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC: <dmaengine@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Eugen Hristev
	<eugen.hristev@...aro.org>
Subject: [PATCH v2 0/4] dmaengine: stm32-dma3: improvements and helper
 functions

This series introduces improvements and helper functions for channel
and driver management.

It enables proper unloading of the stm32_dma3 module, replacing the
previous subsys_initcall() mechanism with module_plaform_driver().

It introduces helper functions to take and release the channel semaphore,
and restores the semaphore state on resume, considering the possible
reset of CxSEMCR register during suspend.

It also adds a helper to retrieve the device pointer from the dma_device
structure contained in stm32_dma3_ddata, simplifying the code.

Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
---
Changes in v2:
- Refine PATCH 4/4 commit description and remove unintended blank line
- Collect Reviewed-by tag
- Link to v1: https://lore.kernel.org/r/20251103-dma3_improv-v1-0-57f048bf2877@foss.st.com

---
Amelie Delaunay (4):
      dmaengine: stm32-dma3: use module_platform_driver
      dmaengine: stm32-dma3: introduce channel semaphore helpers
      dmaengine: stm32-dma3: restore channel semaphore status after suspend
      dmaengine: stm32-dma3: introduce ddata2dev helper

 drivers/dma/stm32/stm32-dma3.c | 165 +++++++++++++++++++++++++++++++++--------
 1 file changed, 136 insertions(+), 29 deletions(-)
---
base-commit: 398035178503bf662281bbffb4bebce1460a4bc5
change-id: 20251103-dma3_improv-b4b36ee231e4

Best regards,
-- 
Amelie Delaunay <amelie.delaunay@...s.st.com>