[PATCH v4 0/13] dmaengine: introduce sg_nents_for_dma() and convert users

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

A handful of the DMAengine drivers use same routine to calculate the number of
SG entries needed for the given DMA transfer. Provide a common helper for them
and convert.

I left the new helper on SG level of API because brief grepping shows potential
candidates outside of DMA engine, e.g.:

  drivers/crypto/chelsio/chcr_algo.c:154:  nents += DIV_ROUND_UP(less, entlen);
  drivers/spi/spi-stm32.c:1495:  /* Count the number of entries needed */

Changelog v4:
- fixed compilation errors (Vinod)

v3: <20251113151603.3031717-1-andriy.shevchenko@linux.intel.com>

Changelog v3:
- added missed EXPORT_SYMBOL() (Bjorn)
- left the return type as signed int (as agreed with Bjorn)
- collected tags (Bjorn)

v2: <20251110103805.3562136-1-andriy.shevchenko@linux.intel.com>

Changelog v2:
- dropped outdated patches (only 9 years passed :-)
- rebased on top of the current kernel
- left API SG wide It might

v1: https://patchwork.kernel.org/project/linux-dmaengine/patch/20161021173535.100245-1-andriy.shevchenko@linux.intel.com/

Andy Shevchenko (13):
  scatterlist: introduce sg_nents_for_dma() helper
  dmaengine: altera-msgdma: use sg_nents_for_dma() helper
  dmaengine: axi-dmac: use sg_nents_for_dma() helper
  dmaengine: bcm2835-dma: use sg_nents_for_dma() helper
  dmaengine: dw-axi-dmac: use sg_nents_for_dma() helper
  dmaengine: k3dma: use sg_nents_for_dma() helper
  dmaengine: lgm: use sg_nents_for_dma() helper
  dmaengine: pxa-dma: use sg_nents_for_dma() helper
  dmaengine: qcom: adm: use sg_nents_for_dma() helper
  dmaengine: qcom: bam_dma: use sg_nents_for_dma() helper
  dmaengine: sa11x0: use sg_nents_for_dma() helper
  dmaengine: sh: use sg_nents_for_dma() helper
  dmaengine: xilinx: xdma: use sg_nents_for_dma() helper

 drivers/dma/altera-msgdma.c                   |  5 ++--
 drivers/dma/bcm2835-dma.c                     | 19 +-------------
 drivers/dma/dma-axi-dmac.c                    |  5 +---
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    |  6 ++---
 drivers/dma/k3dma.c                           |  9 ++-----
 drivers/dma/lgm/lgm-dma.c                     |  9 ++-----
 drivers/dma/pxa_dma.c                         |  5 ++--
 drivers/dma/qcom/bam_dma.c                    |  9 ++-----
 drivers/dma/qcom/qcom_adm.c                   |  9 +++----
 drivers/dma/sa11x0-dma.c                      |  6 ++---
 drivers/dma/sh/shdma-base.c                   |  5 ++--
 drivers/dma/xilinx/xdma.c                     |  6 ++---
 include/linux/scatterlist.h                   |  2 ++
 lib/scatterlist.c                             | 26 +++++++++++++++++++
 14 files changed, 52 insertions(+), 69 deletions(-)

-- 
2.50.1