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

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Date: Thu, 20 Jun 2024 19:56:33 +0200
From: Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
To: Vinod Koul <vkoul@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"J.M.B. Downing" <jonathan.downing@...tel.com>,
	Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Andi Shyti <andi.shyti@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Yangtao Li <frank.li@...o.com>,
	Arnd Bergmann <arnd@...db.de>,
	Li Zetao <lizetao1@...wei.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Chancel Liu <chancel.liu@....com>,
	dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-sound@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-i2c@...r.kernel.org,
	linux-mtd@...ts.infradead.org
Cc: Markus Elfring <Markus.Elfring@....de>
Subject: [Patch v4 02/10] 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@...esys.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@...tel.com>
+  - Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.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@...04000 {
+      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@...tel.com>
+M:	Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
+R:	Vladimir Zapolskiy <vz@...ia.com>
+L:	linux-arm-kernel@...ts.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@...n.ch>
 M:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
-- 
2.25.1