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dt-bindings: dma: ti: k3-udma: Describe cfg register regions

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Unified DMA (UDMA) module on K3 SoCs have TX and RX channel cfg and RX
flow cfg register regions which are usually configured by a Device
Management firmware. But certain entities such as bootloader (like
U-Boot) may have to access them directly. Describe this region in the
binding documentation for completeness of module description.

Keep the binding compatible with existing DTS files by requiring first
four regions to be present at least.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231124045722.191817-5-vigneshr@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Vignesh Raghavendra 2023-11-24 10:27:22 +05:30 committed by Vinod Koul
parent 8d75e0e5ee
commit d7aaccd3be
1 changed files with 13 additions and 2 deletions
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15
Documentation/devicetree/bindings/dma/ti/k3-udma.yaml
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@ -69,16 +69,24 @@ properties:
- ti,j721e-navss-mcu-udmap
reg:
minItems: 3
items:
- description: UDMA-P Control /Status Registers region
- description: RX Channel Realtime Registers region
- description: TX Channel Realtime Registers region
- description: TX Configuration Registers region
- description: RX Configuration Registers region
- description: RX Flow Configuration Registers region
reg-names:
minItems: 3
items:
- const: gcfg
- const: rchanrt
- const: tchanrt
- const: tchan
- const: rchan
- const: rflow
msi-parent: true
@ -161,8 +169,11 @@ examples:
compatible = "ti,am654-navss-main-udmap";
reg = <0x0 0x31150000 0x0 0x100>,
<0x0 0x34000000 0x0 0x100000>,
<0x0 0x35000000 0x0 0x100000>;
reg-names = "gcfg", "rchanrt", "tchanrt";
<0x0 0x35000000 0x0 0x100000>,
<0x0 0x30b00000 0x0 0x20000>,
<0x0 0x30c00000 0x0 0x8000>,
<0x0 0x30d00000 0x0 0x4000>;
reg-names = "gcfg", "rchanrt", "tchanrt", "tchan", "rchan", "rflow";
#dma-cells = <1>;
ti,ringacc = <&ringacc>;