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

Piotr Wojtaszczyk
2024-07-01T12:22:55Z

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>
---
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@nautel.com>
+ - Piotr Wojtaszczyk <piotr.wojtaszczyk@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@40004000 {
+ compatible = "nxp,lpc3220-creg", "syscon", "simple-mfd";
+ reg = <0x40004000 0x114>;
+ ranges = <0 0x40004000 0x114>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ dma-router@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@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
+N: lpc32xx
+
ARM/Marvell Dove/MV78xx0/Orion SOC support
M: Andrew Lunn <andrew@lunn.ch>
M: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
--
2.25.1