linux-kernel - [PATCH RFC 1/8] dt-bindings: iio: dac: ad3552r: add io-backend property

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Message-Id: <20240829-wip-bl-ad3552r-axi-v0-v1-1-b6da6015327a@baylibre.com>
Date: Thu, 29 Aug 2024 14:31:59 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dlechner@...libre.com, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH RFC 1/8] dt-bindings: iio: dac: ad3552r: add io-backend
 property

From: Angelo Dureghello <adureghello@...libre.com>

There is a version AXI DAC IP block (for FPGAs) that provides
a physical bus for AD3552R and similar chips. This can be used
instead of a typical SPI controller to be able to use the chip
in ways that typical SPI controllers are not capable of.

The binding is modified so that either the device is a SPI
peripheral or it uses an io-backend.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 .../devicetree/bindings/iio/dac/adi,ad3552r.yaml   | 39 ++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
index fc8b97f82077..1874486229ad 100644
--- a/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
@@ -60,12 +60,34 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [0, 1, 2, 3]
 
+  io-backends:
+    description: The iio backend reference.
+      An example backend can be found at
+        https://analogdevicesinc.github.io/hdl/library/axi_ad3552r/index.html
+    maxItems: 1
+
   '#address-cells':
     const: 1
 
   '#size-cells':
     const: 0
 
+if:
+  required:
+    - reg
+
+then:
+  $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+  properties:
+    io-backends: false
+
+  required: [ spi-max-frequency ]
+
+else:
+  required:
+    - io-backends
+
 patternProperties:
   "^channel@([0-1])$":
     type: object
@@ -207,8 +229,6 @@ allOf:
 
 required:
   - compatible
-  - reg
-  - spi-max-frequency
 
 additionalProperties: false
 
@@ -238,4 +258,19 @@ examples:
             };
         };
     };
+
+  - |
+    fpga_axi {
+        ad3552r {
+            compatible = "adi,ad3552r";
+            reset-gpios = <&gpio0 92 1>;
+            io-backends = <&backend>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            channel@0 {
+                reg = <0>;
+                adi,output-range-microvolt = <(-5000000) (5000000)>;
+            };
+        };
+    };
 ...

-- 
2.45.0.rc1