linux-kernel - [PATCH v3 1/3] dt-bindings: memory-controllers: Add fsl,elbc-gpcm-uio

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Message-Id: <20250226-ppcyaml-elbc-v3-1-a90ed71da838@posteo.net>
Date: Wed, 26 Feb 2025 18:01:40 +0100
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Krzysztof Kozlowski <krzk+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: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-mtd@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, 
 J. Neuschäfer <j.ne@...teo.net>, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v3 1/3] dt-bindings: memory-controllers: Add
 fsl,elbc-gpcm-uio

From: "J. Neuschäfer" <j.ne@...teo.net>

Formalize the binding already supported by the uio_fsl_elbc_gpcm.c
driver.

Reviewed-by: Frank Li <Frank.Li@....com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---

V3:
- add review tags

V2:
- split out from fsl,elbc patch
- add description
- remove "device_type" property
- move to bindings/memory-controllers
---
 .../memory-controllers/fsl,elbc-gpcm-uio.yaml      | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/Documentation/devicetree/bindings/memory-controllers/fsl,elbc-gpcm-uio.yaml b/Documentation/devicetree/bindings/memory-controllers/fsl,elbc-gpcm-uio.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..381584b400a0ad98c6d9e0b38f2877d44603ed84
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/fsl,elbc-gpcm-uio.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/fsl,elbc-gpcm-uio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Userspace I/O interface for Freescale eLBC devices
+
+description:
+  The Freescale Enhanced Local Bus controller (eLBC) supports flexible access
+  to memory devices, through the General-Purpose Chip-select Machine (GPCM).
+  The purpose of this binding is to designate devices attached to eLBC/GPMC for
+  use by userspace.
+
+maintainers:
+  - J. Neuschäfer <j.ne@...teo.net>
+
+properties:
+  compatible:
+    const: fsl,elbc-gpcm-uio
+
+  reg:
+    maxItems: 1
+
+  elbc-gpcm-br:
+    description: Base Register (BR) value to set
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  elbc-gpcm-or:
+    description: Option Register (OR) value to set
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  interrupts:
+    maxItems: 1
+
+  uio_name:
+    $ref: /schemas/types.yaml#/definitions/string
+
+required:
+  - compatible
+  - reg
+  - elbc-gpcm-br
+  - elbc-gpcm-or
+
+additionalProperties: false
+
+examples:
+  - |
+    localbus {
+        #address-cells = <2>;
+        #size-cells = <1>;
+
+        simple-periph@2,0 {
+            compatible = "fsl,elbc-gpcm-uio";
+            reg = <0x2 0x0 0x10000>;
+            elbc-gpcm-br = <0xfd810800>;
+            elbc-gpcm-or = <0xffff09f7>;
+        };
+    };

-- 
2.48.0.rc1.219.gb6b6757d772