From def1baeb25cfe310ee608a99059354ea131d4317 Mon Sep 17 00:00:00 2001
From: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
Date: Thu, 27 Jun 2024 17:00:20 +0200
Subject: [PATCH] dt-bindings: dma: Add lpc32xx DMA mux binding
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>
---
.../bindings/dma/nxp,lpc3220-dmamux.yaml | 49 +++++++++++++++++++
MAINTAINERS | 9 ++++
2 files changed, 58 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
diff --git a/Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml b/Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
new file mode 100644
index 0000000000000..32f2087441544
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
@@ -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>;
+ };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index ca9e12cf81b19..308482219e1bb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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>
--
GitLab