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dt-bindings: dma: Add lpc32xx DMA mux binding

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LPC32XX SoCs use pl080 dma controller which have few request signals
multiplexed between peripherals. This binding describes how devices can
use the multiplexed request signals.

Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240627150046.258795-3-piotr.wojtaszczyk@timesys.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Piotr Wojtaszczyk 2024-06-27 17:00:20 +02:00 committed by Rob Herring (Arm)
parent f8fd66468f
commit def1baeb25
2 changed files with 58 additions and 0 deletions
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49
Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml Normal file
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@ -0,0 +1,49 @@
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/nxp,lpc3220-dmamux.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: DMA multiplexer for LPC32XX SoC (DMA request router)
maintainers:
- J.M.B. Downing <jonathan.downing@nautel.com>
- Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
allOf:
- $ref: dma-router.yaml#
properties:
compatible:
const: nxp,lpc3220-dmamux
reg:
maxItems: 1
dma-masters:
description: phandle to a dma node compatible with arm,pl080
maxItems: 1
"#dma-cells":
const: 3
description: |
First two cells same as for device pointed in dma-masters.
Third cell represents mux value for the request.
required:
- compatible
- reg
- dma-masters
additionalProperties: false
examples:
- |
dma-router@7c {
compatible = "nxp,lpc3220-dmamux";
reg = <0x7c 0x8>;
dma-masters = <&dma>;
#dma-cells = <3>;
};
...

9
MAINTAINERS
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@ -2428,6 +2428,7 @@ N: lpc18xx
ARM/LPC32XX SOC SUPPORT
M: Vladimir Zapolskiy <vz@mleia.com>
M: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
T: git git://github.com/vzapolskiy/linux-lpc32xx.git
@ -2440,6 +2441,14 @@ F: drivers/usb/host/ohci-nxp.c
F: drivers/watchdog/pnx4008_wdt.c
N: lpc32xx
LPC32XX DMAMUX SUPPORT
M: J.M.B. Downing <jonathan.downing@nautel.com>
M: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
R: Vladimir Zapolskiy <vz@mleia.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
ARM/Marvell Dove/MV78xx0/Orion SOC support
M: Andrew Lunn <andrew@lunn.ch>
M: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>