[v2,0/8] RZN1 DMA support

Message

Miquel Raynal Feb. 22, 2022, 10:34 a.m. UTC

Hello,

Here is a first series bringing DMA support to RZN1 platforms. I'm not a
DMA expert at all so criticism is welcome.

Soon a second series will come with changes made to the UART controller
driver, in order to interact with the RZN1 DMA controller.

Cheers,
Miquèl

Changes in v2:
* Clarified that the 'fix' regarding non aligned reads would only apply
  to the DEV_TO_MEM case.
* Fix the DMA controller compatible string (copy-paste error).
* s/syscon/sysctrl/ as advised by Geert.
* Disabled irqs when taking the spinlock from the clocks driver.
* Moved the DMAMUX offset inside the driver.
* Removed extra commas.
* Improved the style as suggested by Andy.
* Removed a dupplicated check against the device node presence.
* Reduced the number of lines of code by using dev_err_probe().
* Created a Kconfig symbol for DMAMUX to fix the two robot reports
  received and be sure there was no useless overhead with other
  platforms.

Miquel Raynal (7):
  dt-bindings: dma: Introduce RZN1 dmamux bindings
  dt-bindings: dma: Introduce RZN1 DMA compatible
  soc: renesas: rzn1-sysc: Export function to set dmamux
  dma: dmamux: Introduce RZN1 DMA router support
  dma: dw: Add RZN1 compatible
  ARM: dts: r9a06g032: Add the two DMA nodes
  ARM: dts: r9a06g032: Describe the DMA router

Phil Edworthy (1):
  dma: dw: Avoid partial transfers

 .../bindings/dma/renesas,rzn1-dmamux.yaml     |  42 +++++
 .../bindings/dma/snps,dma-spear1340.yaml      |   8 +-
 MAINTAINERS                                   |   1 +
 arch/arm/boot/dts/r9a06g032.dtsi              |  37 ++++
 drivers/clk/renesas/r9a06g032-clocks.c        |  31 ++++
 drivers/dma/dw/Kconfig                        |   8 +
 drivers/dma/dw/Makefile                       |   2 +
 drivers/dma/dw/core.c                         |   3 +
 drivers/dma/dw/dmamux.c                       | 167 ++++++++++++++++++
 drivers/dma/dw/platform.c                     |   1 +
 include/linux/soc/renesas/r9a06g032-sysctrl.h |  11 ++
 11 files changed, 310 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/dma/renesas,rzn1-dmamux.yaml
 create mode 100644 drivers/dma/dw/dmamux.c
 create mode 100644 include/linux/soc/renesas/r9a06g032-sysctrl.h