linux-kernel - [Patch v5 02/12] dt-bindings: dma: Add lpc32xx DMA mux binding

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Message-Id: <20240627150046.258795-3-piotr.wojtaszczyk@timesys.com>
Date: Thu, 27 Jun 2024 17:00:20 +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>,
	Corentin Labbe <clabbe@...libre.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
Subject: [Patch v5 02/12] 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 v5:
- Corrected property order
- Added maxItems to properties
- Fixed example
- Removed "N:: from the MAINTAINERS entry
- Added Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com> to LPC32XX maintainers

Changes for v4:
- This patch is new in v4

 .../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 000000000000..32f208744154
--- /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@...tel.com>
+  - Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.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 aacccb376c28..79b44addc139 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2384,6 +2384,7 @@ N:	lpc18xx
 
 ARM/LPC32XX SOC SUPPORT
 M:	Vladimir Zapolskiy <vz@...ia.com>
+M:	Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
 L:	linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
 S:	Maintained
 T:	git git://github.com/vzapolskiy/linux-lpc32xx.git
@@ -2396,6 +2397,14 @@ 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@...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
+
 ARM/Marvell Dove/MV78xx0/Orion SOC support
 M:	Andrew Lunn <andrew@...n.ch>
 M:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
-- 
2.25.1