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| author | Fabien Lahoudere <fabien.lahoudere@collabora.com> | 2021-04-30 19:50:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-04 15:11:16 +0200 |
| commit | db0a196bd8ad1d6bb4b1a9e54f54c09f8dc2cc25 (patch) | |
| tree | f5bcfce7bcaa5837de636f0e7ba7f45f9e707990 /Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml | |
| parent | Merge 5.13-rc4 into tty-next (diff) | |
| download | linux-db0a196bd8ad1d6bb4b1a9e54f54c09f8dc2cc25.tar.xz linux-db0a196bd8ad1d6bb4b1a9e54f54c09f8dc2cc25.zip | |
serial: imx: Add DMA buffer configuration via DT
In order to optimize serial communication (performance/throughput VS
latency), we may need to tweak DMA period number and size. This adds
DT properties to configure those values before initialising DMA.
The defaults will stay the same as before.
[update documentation and commit message, rebase to current master,
switch back to DT instead of sysfs]
Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20210430175038.103226-2-sebastian.reichel@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml index 2b06c6ce4a75..9d949296a142 100644 --- a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml +++ b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml @@ -71,6 +71,18 @@ properties: received, and that the peripheral should invert its input using the INVR registers. + fsl,dma-info: + $ref: /schemas/types.yaml#/definitions/uint32-array + minItems: 2 + maxItems: 2 + description: | + First cell contains the size of DMA buffer chunks, second cell contains + the amount of chunks used for the device. Multiplying both numbers is + the total size of memory used for receiving data. + When not being configured the system will use default settings, which + are sensible for most use cases. If you need low latency processing on + slow connections this needs to be configured appropriately. + uart-has-rtscts: true rs485-rts-delay: true |