[PATCH v4 0/9] RZN1 DMA support

Miquel Raynal
2022-03-10T15:58:11Z

Hello,

Here is a first series bringing DMA support to RZN1 platforms. 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 v4:
* Freed "map" in the error path of the dmamux driver.
* Improved a bit the style as requested by Prabhakar.
* Dropped a __maybe_unused.
* Reorder the includes.
* Added a dependency on ARCH_RZN1.
* Added Rob's Ack.
* Added a reg property to the dmamux binding file.
* Referenced the dmamux binding from the system controller file.
* Called of_platform_populate from the end of the system controller
(clock) driver probe in order to probe the dmamux if it was
populated.
* Added DMA properties to all the relevant UARTs.

Changes in v3:
* Added Reviewed-by tags.
* Exported the set_dmamux* symbol properly.
* Dropped a useless check in the probe and moved the sysctrl_priv
assignation to the end of the probe.
* Renamed the dmamux driver
* Added a couple of missing MODULE_ macros in the dmamux driver.
* Decided to use a regular platform init call instead of the
arch_initcall() initially proposed.
* s/%d/%u/ in printk's when appropriate.
* Used a hardcoded value instead of dmamux->dmac_requests when
appropriate.
* Changed the variable name "master" to "dmac_idx" to be more
descriptive.
* Dropped most of the of_* calls in favor of #define's.
* Fixed a typo.
* Exported two symbols from 8250_dma.c.

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.
* Exported the serial8250_{tx,rx}_dma() symbols.

Miquel Raynal (9):
dt-bindings: dma: Introduce RZN1 dmamux bindings
dt-bindings: clock: r9a06g032-sysctrl: Reference the DMAMUX subnode
dt-bindings: dma: Introduce RZN1 DMA compatible
soc: renesas: rzn1-sysc: Export function to set dmamux
dma: dw: dmamux: Introduce RZN1 DMA router support
dma: dw: Add RZN1 compatible
dma: dw: Avoid partial transfers
ARM: dts: r9a06g032: Add the two DMA nodes
ARM: dts: r9a06g032: Describe the DMA router

.../clock/renesas,r9a06g032-sysctrl.yaml | 11 ++
.../bindings/dma/renesas,rzn1-dmamux.yaml | 51 ++++++
.../bindings/dma/snps,dma-spear1340.yaml | 8 +-
MAINTAINERS | 1 +
arch/arm/boot/dts/r9a06g032.dtsi | 40 +++++
drivers/clk/renesas/r9a06g032-clocks.c | 36 ++++-
drivers/dma/dw/Kconfig | 9 ++
drivers/dma/dw/Makefile | 2 +
drivers/dma/dw/core.c | 4 +
drivers/dma/dw/platform.c | 1 +
drivers/dma/dw/rzn1-dmamux.c | 152 ++++++++++++++++++
include/linux/soc/renesas/r9a06g032-sysctrl.h | 11 ++
12 files changed, 324 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/dma/renesas,rzn1-dmamux.yaml
create mode 100644 drivers/dma/dw/rzn1-dmamux.c
create mode 100644 include/linux/soc/renesas/r9a06g032-sysctrl.h

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2.27.0