[Patch v4 02/10] dt-bindings: dma: Add lpc32xx DMA mux binding

[Piotr Wojtaszczyk]

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 at timesys.com>
---
Changes for v4:
- This patch is new in v4

 .../bindings/dma/nxp,lpc3220-dmamux.yaml      | 56 +++++++++++++++++++
 MAINTAINERS                                   |  9 +++
 2 files changed, 65 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 000000000000..a5384b6c67fc
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
@@ -0,0 +1,56 @@
+# 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 at nautel.com>
+  - Piotr Wojtaszczyk <piotr.wojtaszczyk at timesys.com>
+
+allOf:
+  - $ref: dma-router.yaml#
+
+properties:
+  "#dma-cells":
+    const: 3
+    description: |
+      First two cells same as for device pointed in dma-masters.
+      Third cell represents mux value for the request.
+
+  compatible:
+    const: nxp,lpc3220-dmamux
+
+  dma-masters:
+    description: phandle to a dma node compatible with arm,pl080
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - dma-masters
+
+additionalProperties: false
+
+examples:
+  - |
+    syscon at 40004000 {
+      compatible = "nxp,lpc3220-creg", "syscon", "simple-mfd";
+      reg = <0x40004000 0x114>;
+      ranges = <0 0x40004000 0x114>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      dma-router at 7c {
+        compatible = "nxp,lpc3220-dmamux";
+        reg = <0x7c 0x8>;
+        #dma-cells = <3>;
+        dma-masters = <&dma>;
+      };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index aacccb376c28..f7adf9f66dfa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2396,6 +2396,15 @@ F:	drivers/usb/host/ohci-nxp.c
 F:	drivers/watchdog/pnx4008_wdt.c
 N:	lpc32xx
 
+ARM/LPC32XX DMAMUX SUPPORT
+M:	J.M.B. Downing <jonathan.downing at nautel.com>
+M:	Piotr Wojtaszczyk <piotr.wojtaszczyk at timesys.com>
+R:	Vladimir Zapolskiy <vz at mleia.com>
+L:	linux-arm-kernel at lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	Documentation/devicetree/bindings/dma/nxp,lpc3220-dmamux.yaml
+N:	lpc32xx
+
 ARM/Marvell Dove/MV78xx0/Orion SOC support
 M:	Andrew Lunn <andrew at lunn.ch>
 M:	Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
-- 
2.25.1