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Message-Id: <20250226-ppcyaml-dma-v3-1-79ce3133569f@posteo.net>
Date: Wed, 26 Feb 2025 16:57:17 +0100
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Crystal Wood <oss@...error.net>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Naveen N Rao <naveen@...nel.org>
Cc: dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
J. Neuschäfer <j.ne@...teo.net>
Subject: [PATCH v3] dt-bindings: dma: Convert fsl,elo*-dma to YAML
From: "J. Neuschäfer" <j.ne@...teo.net>
The devicetree bindings for Freescale DMA engines have so far existed as
a text file. This patch converts them to YAML, and specifies all the
compatible strings currently in use in arch/powerpc/boot/dts.
Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---
I considered referencing dma-controller.yaml, but that requires
the #dma-cells property (via dma-common.yaml), and I'm now sure which
value it should have, if any. Therefore I did not reference
dma-controller.yaml.
V3:
- split out as a single patch
- restructure "description" definitions to use "items:" as much as possible
- remove useless description of interrupts in fsl,elo3-dma
- rename DMA controller nodes to dma-controller@...
- use IRQ_TYPE_* constants in examples
- define unit address format for DMA channel nodes
- drop interrupts-parent properties from examples
V2:
- part of series [PATCH v2 00/12] YAML conversion of several Freescale/PowerPC DT bindings
Link: https://lore.kernel.org/lkml/20250207-ppcyaml-v2-5-8137b0c42526@posteo.net/
- remove unnecessary multiline markers
- fix additionalProperties to always be false
- add description/maxItems to interrupts
- add missing #address-cells/#size-cells properties
- convert "Note on DMA channel compatible properties" to YAML by listing
fsl,ssi-dma-channel as a valid compatible value
- fix property ordering in examples: compatible and reg come first
- add missing newlines in examples
- trim subject line (remove "bindings")
---
.../devicetree/bindings/dma/fsl,elo-dma.yaml | 137 ++++++++++++++
.../devicetree/bindings/dma/fsl,elo3-dma.yaml | 125 +++++++++++++
.../devicetree/bindings/dma/fsl,eloplus-dma.yaml | 132 +++++++++++++
.../devicetree/bindings/powerpc/fsl/dma.txt | 204 ---------------------
4 files changed, 394 insertions(+), 204 deletions(-)
diff --git a/Documentation/devicetree/bindings/dma/fsl,elo-dma.yaml b/Documentation/devicetree/bindings/dma/fsl,elo-dma.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..628f41355e41598dc24d59e92530d93b7e2bc590
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl,elo-dma.yaml
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/fsl,elo-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale Elo DMA Controller
+
+maintainers:
+ - J. Neuschäfer <j.ne@...teo.net>
+
+description:
+ This is a little-endian 4-channel DMA controller, used in Freescale mpc83xx
+ series chips such as mpc8315, mpc8349, mpc8379 etc.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - fsl,mpc8313-dma
+ - fsl,mpc8315-dma
+ - fsl,mpc8323-dma
+ - fsl,mpc8347-dma
+ - fsl,mpc8349-dma
+ - fsl,mpc8360-dma
+ - fsl,mpc8377-dma
+ - fsl,mpc8378-dma
+ - fsl,mpc8379-dma
+ - const: fsl,elo-dma
+
+ reg:
+ items:
+ - description:
+ DMA General Status Register, i.e. DGSR which contains status for
+ all the 4 DMA channels.
+
+ cell-index:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Controller index. 0 for controller @ 0x8100.
+
+ ranges: true
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 1
+
+ interrupts:
+ maxItems: 1
+ description: Controller interrupt.
+
+required:
+ - compatible
+ - reg
+
+patternProperties:
+ "^dma-channel@[0-9a-f]+$":
+ type: object
+ additionalProperties: false
+
+ properties:
+ compatible:
+ oneOf:
+ # native DMA channel
+ - items:
+ - enum:
+ - fsl,mpc8315-dma-channel
+ - fsl,mpc8323-dma-channel
+ - fsl,mpc8347-dma-channel
+ - fsl,mpc8349-dma-channel
+ - fsl,mpc8360-dma-channel
+ - fsl,mpc8377-dma-channel
+ - fsl,mpc8378-dma-channel
+ - fsl,mpc8379-dma-channel
+ - const: fsl,elo-dma-channel
+
+ # audio DMA channel, see fsl,ssi.yaml
+ - const: fsl,ssi-dma-channel
+
+ reg:
+ maxItems: 1
+
+ cell-index:
+ description: DMA channel index starts at 0.
+
+ interrupts:
+ maxItems: 1
+ description:
+ Per-channel interrupt. Only necessary if no controller interrupt has
+ been provided.
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ dma-controller@...8 {
+ compatible = "fsl,mpc8349-dma", "fsl,elo-dma";
+ reg = <0x82a8 4>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x8100 0x1a4>;
+ interrupts = <71 IRQ_TYPE_LEVEL_LOW>;
+ cell-index = <0>;
+
+ dma-channel@0 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ reg = <0 0x80>;
+ cell-index = <0>;
+ interrupts = <71 IRQ_TYPE_LEVEL_LOW>;
+ };
+
+ dma-channel@80 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ reg = <0x80 0x80>;
+ cell-index = <1>;
+ interrupts = <71 IRQ_TYPE_LEVEL_LOW>;
+ };
+
+ dma-channel@100 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ reg = <0x100 0x80>;
+ cell-index = <2>;
+ interrupts = <71 IRQ_TYPE_LEVEL_LOW>;
+ };
+
+ dma-channel@180 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ reg = <0x180 0x80>;
+ cell-index = <3>;
+ interrupts = <71 IRQ_TYPE_LEVEL_LOW>;
+ };
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/dma/fsl,elo3-dma.yaml b/Documentation/devicetree/bindings/dma/fsl,elo3-dma.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..6b9615a041f8f3292bc4f033b1b72584883b8941
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl,elo3-dma.yaml
@@ -0,0 +1,125 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/fsl,elo3-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale Elo3 DMA Controller
+
+maintainers:
+ - J. Neuschäfer <j.ne@...teo.net>
+
+description:
+ DMA controller which has same function as EloPlus except that Elo3 has 8
+ channels while EloPlus has only 4, it is used in Freescale Txxx and Bxxx
+ series chips, such as t1040, t4240, b4860.
+
+properties:
+ compatible:
+ const: fsl,elo3-dma
+
+ reg:
+ items:
+ - description:
+ DMA General Status Registers starting from DGSR0, for channel 1~4
+ - description:
+ DMA General Status Registers starting from DGSR1, for channel 5~8
+
+ ranges: true
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 1
+
+ interrupts:
+ maxItems: 1
+
+patternProperties:
+ "^dma-channel@[0-9a-f]+$":
+ type: object
+ additionalProperties: false
+
+ properties:
+ compatible:
+ enum:
+ # native DMA channel
+ - fsl,eloplus-dma-channel
+
+ # audio DMA channel, see fsl,ssi.yaml
+ - fsl,ssi-dma-channel
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+ description:
+ Per-channel interrupt. Only necessary if no controller interrupt has
+ been provided.
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ dma-controller@...300 {
+ compatible = "fsl,elo3-dma";
+ reg = <0x100300 0x4>,
+ <0x100600 0x4>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x100100 0x500>;
+
+ dma-channel@0 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x0 0x80>;
+ interrupts = <28 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@80 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x80 0x80>;
+ interrupts = <29 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@100 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x100 0x80>;
+ interrupts = <30 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@180 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x180 0x80>;
+ interrupts = <31 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@300 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x300 0x80>;
+ interrupts = <76 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@380 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x380 0x80>;
+ interrupts = <77 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@400 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x400 0x80>;
+ interrupts = <78 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+
+ dma-channel@480 {
+ compatible = "fsl,eloplus-dma-channel";
+ reg = <0x480 0x80>;
+ interrupts = <79 IRQ_TYPE_EDGE_FALLING 0 0>;
+ };
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/dma/fsl,eloplus-dma.yaml b/Documentation/devicetree/bindings/dma/fsl,eloplus-dma.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..62d0e0e78b4f74622cba167a9ba847c4e9fb80c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl,eloplus-dma.yaml
@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/fsl,eloplus-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale EloPlus DMA Controller
+
+maintainers:
+ - J. Neuschäfer <j.ne@...teo.net>
+
+description:
+ This is a 4-channel DMA controller with extended addresses and chaining,
+ mainly used in Freescale mpc85xx/86xx, Pxxx and BSC series chips, such as
+ mpc8540, mpc8641 p4080, bsc9131 etc.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - fsl,mpc8540-dma
+ - fsl,mpc8541-dma
+ - fsl,mpc8548-dma
+ - fsl,mpc8555-dma
+ - fsl,mpc8560-dma
+ - fsl,mpc8572-dma
+ - fsl,mpc8641-dma
+ - const: fsl,eloplus-dma
+ - const: fsl,eloplus-dma
+
+ reg:
+ items:
+ - description:
+ DMA General Status Register, i.e. DGSR which contains
+ status for all the 4 DMA channels
+
+ cell-index:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ controller index. 0 for controller @ 0x21000, 1 for controller @ 0xc000
+
+ ranges: true
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 1
+
+ interrupts:
+ maxItems: 1
+ description: Controller interrupt.
+
+patternProperties:
+ "^dma-channel@[0-9a-f]+$":
+ type: object
+ additionalProperties: false
+
+ properties:
+ compatible:
+ oneOf:
+ # native DMA channel
+ - items:
+ - enum:
+ - fsl,mpc8540-dma-channel
+ - fsl,mpc8541-dma-channel
+ - fsl,mpc8548-dma-channel
+ - fsl,mpc8555-dma-channel
+ - fsl,mpc8560-dma-channel
+ - fsl,mpc8572-dma-channel
+ - const: fsl,eloplus-dma-channel
+
+ # audio DMA channel, see fsl,ssi.yaml
+ - const: fsl,ssi-dma-channel
+
+ reg:
+ maxItems: 1
+
+ cell-index:
+ description: DMA channel index starts at 0.
+
+ interrupts:
+ maxItems: 1
+ description:
+ Per-channel interrupt. Only necessary if no controller interrupt has
+ been provided.
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ dma-controller@...00 {
+ compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
+ reg = <0x21300 4>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x21100 0x200>;
+ cell-index = <0>;
+
+ dma-channel@0 {
+ compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
+ reg = <0 0x80>;
+ cell-index = <0>;
+ interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
+ };
+
+ dma-channel@80 {
+ compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
+ reg = <0x80 0x80>;
+ cell-index = <1>;
+ interrupts = <21 IRQ_TYPE_EDGE_FALLING>;
+ };
+
+ dma-channel@100 {
+ compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
+ reg = <0x100 0x80>;
+ cell-index = <2>;
+ interrupts = <22 IRQ_TYPE_EDGE_FALLING>;
+ };
+
+ dma-channel@180 {
+ compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
+ reg = <0x180 0x80>;
+ cell-index = <3>;
+ interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
+ };
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt
deleted file mode 100644
index c11ad5c6db2190bf38c160632d9997122e169945..0000000000000000000000000000000000000000
--- a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt
+++ /dev/null
@@ -1,204 +0,0 @@
-* Freescale DMA Controllers
-
-** Freescale Elo DMA Controller
- This is a little-endian 4-channel DMA controller, used in Freescale mpc83xx
- series chips such as mpc8315, mpc8349, mpc8379 etc.
-
-Required properties:
-
-- compatible : must include "fsl,elo-dma"
-- reg : DMA General Status Register, i.e. DGSR which contains
- status for all the 4 DMA channels
-- ranges : describes the mapping between the address space of the
- DMA channels and the address space of the DMA controller
-- cell-index : controller index. 0 for controller @ 0x8100
-- interrupts : interrupt specifier for DMA IRQ
-
-- DMA channel nodes:
- - compatible : must include "fsl,elo-dma-channel"
- However, see note below.
- - reg : DMA channel specific registers
- - cell-index : DMA channel index starts at 0.
-
-Optional properties:
- - interrupts : interrupt specifier for DMA channel IRQ
- (on 83xx this is expected to be identical to
- the interrupts property of the parent node)
-
-Example:
- dma@...8 {
- #address-cells = <1>;
- #size-cells = <1>;
- compatible = "fsl,mpc8349-dma", "fsl,elo-dma";
- reg = <0x82a8 4>;
- ranges = <0 0x8100 0x1a4>;
- interrupt-parent = <&ipic>;
- interrupts = <71 8>;
- cell-index = <0>;
- dma-channel@0 {
- compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
- cell-index = <0>;
- reg = <0 0x80>;
- interrupt-parent = <&ipic>;
- interrupts = <71 8>;
- };
- dma-channel@80 {
- compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
- cell-index = <1>;
- reg = <0x80 0x80>;
- interrupt-parent = <&ipic>;
- interrupts = <71 8>;
- };
- dma-channel@100 {
- compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
- cell-index = <2>;
- reg = <0x100 0x80>;
- interrupt-parent = <&ipic>;
- interrupts = <71 8>;
- };
- dma-channel@180 {
- compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
- cell-index = <3>;
- reg = <0x180 0x80>;
- interrupt-parent = <&ipic>;
- interrupts = <71 8>;
- };
- };
-
-** Freescale EloPlus DMA Controller
- This is a 4-channel DMA controller with extended addresses and chaining,
- mainly used in Freescale mpc85xx/86xx, Pxxx and BSC series chips, such as
- mpc8540, mpc8641 p4080, bsc9131 etc.
-
-Required properties:
-
-- compatible : must include "fsl,eloplus-dma"
-- reg : DMA General Status Register, i.e. DGSR which contains
- status for all the 4 DMA channels
-- cell-index : controller index. 0 for controller @ 0x21000,
- 1 for controller @ 0xc000
-- ranges : describes the mapping between the address space of the
- DMA channels and the address space of the DMA controller
-
-- DMA channel nodes:
- - compatible : must include "fsl,eloplus-dma-channel"
- However, see note below.
- - cell-index : DMA channel index starts at 0.
- - reg : DMA channel specific registers
- - interrupts : interrupt specifier for DMA channel IRQ
-
-Example:
- dma@...00 {
- #address-cells = <1>;
- #size-cells = <1>;
- compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
- reg = <0x21300 4>;
- ranges = <0 0x21100 0x200>;
- cell-index = <0>;
- dma-channel@0 {
- compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
- reg = <0 0x80>;
- cell-index = <0>;
- interrupt-parent = <&mpic>;
- interrupts = <20 2>;
- };
- dma-channel@80 {
- compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
- reg = <0x80 0x80>;
- cell-index = <1>;
- interrupt-parent = <&mpic>;
- interrupts = <21 2>;
- };
- dma-channel@100 {
- compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
- reg = <0x100 0x80>;
- cell-index = <2>;
- interrupt-parent = <&mpic>;
- interrupts = <22 2>;
- };
- dma-channel@180 {
- compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
- reg = <0x180 0x80>;
- cell-index = <3>;
- interrupt-parent = <&mpic>;
- interrupts = <23 2>;
- };
- };
-
-** Freescale Elo3 DMA Controller
- DMA controller which has same function as EloPlus except that Elo3 has 8
- channels while EloPlus has only 4, it is used in Freescale Txxx and Bxxx
- series chips, such as t1040, t4240, b4860.
-
-Required properties:
-
-- compatible : must include "fsl,elo3-dma"
-- reg : contains two entries for DMA General Status Registers,
- i.e. DGSR0 which includes status for channel 1~4, and
- DGSR1 for channel 5~8
-- ranges : describes the mapping between the address space of the
- DMA channels and the address space of the DMA controller
-
-- DMA channel nodes:
- - compatible : must include "fsl,eloplus-dma-channel"
- - reg : DMA channel specific registers
- - interrupts : interrupt specifier for DMA channel IRQ
-
-Example:
-dma@...300 {
- #address-cells = <1>;
- #size-cells = <1>;
- compatible = "fsl,elo3-dma";
- reg = <0x100300 0x4>,
- <0x100600 0x4>;
- ranges = <0x0 0x100100 0x500>;
- dma-channel@0 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x0 0x80>;
- interrupts = <28 2 0 0>;
- };
- dma-channel@80 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x80 0x80>;
- interrupts = <29 2 0 0>;
- };
- dma-channel@100 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x100 0x80>;
- interrupts = <30 2 0 0>;
- };
- dma-channel@180 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x180 0x80>;
- interrupts = <31 2 0 0>;
- };
- dma-channel@300 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x300 0x80>;
- interrupts = <76 2 0 0>;
- };
- dma-channel@380 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x380 0x80>;
- interrupts = <77 2 0 0>;
- };
- dma-channel@400 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x400 0x80>;
- interrupts = <78 2 0 0>;
- };
- dma-channel@480 {
- compatible = "fsl,eloplus-dma-channel";
- reg = <0x480 0x80>;
- interrupts = <79 2 0 0>;
- };
-};
-
-Note on DMA channel compatible properties: The compatible property must say
-"fsl,elo-dma-channel" or "fsl,eloplus-dma-channel" to be used by the Elo DMA
-driver (fsldma). Any DMA channel used by fsldma cannot be used by another
-DMA driver, such as the SSI sound drivers for the MPC8610. Therefore, any DMA
-channel that should be used for another driver should not use
-"fsl,elo-dma-channel" or "fsl,eloplus-dma-channel". For the SSI drivers, for
-example, the compatible property should be "fsl,ssi-dma-channel". See ssi.txt
-for more information.
---
base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
change-id: 20250220-ppcyaml-dma-89d59a288c8b
Best regards,
--
J. Neuschäfer <j.ne@...teo.net>
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