Hi Emil,

On Thu, 2021-03-25 at 14:14 +0000, Emil Velikov wrote:

On Wed, 24 Mar 2021 at 15:17, Rob Herring [off-list ref] wrote:

quoted

On Thu, Mar 11, 2021 at 03:40:51PM +0000, Emil Velikov wrote:

quoted

From: Emil Velikov <redacted>

Add devicetree binding documentation for the Hantro G1/G2 VDEC on
the Microchip SAMAS5D4 SoC.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <redacted>
Cc: devicetree@vger.kernel.org>
Signed-off-by: Emil Velikov <redacted>
---
v2
 - Newly introduced
 - s/Atmel/Microchip/ (Nicolas)
 - Drop leading 0 in node name/address
---
 .../media/microchip,sama5d4-vdec.yaml         | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/microchip,sama5d4-vdec.yaml

diff --git a/Documentation/devicetree/bindings/media/microchip,sama5d4-vdec.yaml b/Documentation/devicetree/bindings/media/microchip,sama5d4-

vdec.yaml
new file mode 100644
index 000000000000..9cb2c0295d54

--- /dev/null
+++ b/Documentation/devicetree/bindings/media/microchip,sama5d4-vdec.yaml

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/media/microchip,sama5d4-vdec.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Hantro G1 VPU codec implemented on Microchip SAMA5D4 SoCs
+
+maintainers:
+  - Emil Velikov <emil.velikov@collabora.com>
+
+description:
+  Hantro G1 video decode accelerator present on Microchip SAMA5D4 SoCs.
+
+properties:
+  compatible:
+    const: microchip,sama5d4-vdec
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    items:
+      - const: vdec

Why do you need a name? *-names are used to distinguish multiple entries
and don't add anything if only a single entry.

On one hand the names are used to describe the hardware - the SAMA
board uses designated clock and interrupt lines - both called "vdec".
Additionally the names are ultimately required by the underlying API -
platform_get_irq_byname and  devm_clk_bulk_get respectively.
How can we get the respective entries without the name?

There are APIs to get the resource by index as opposed to by name.
E.g. platform_get_irq.

However, you are confusing here internal kernel implementation
with devicetree bindings. The latter is just a representation
of the hardware.

Skimming through the existing dts file -
arch/arm/boot/dts/sama5d4.dtsi and other dts files - there are lots of
examples where the device tree binding contains the name for a single
clock/interrupt.

Note that dtsi and dts are the device-tree files, not the bindings.
And even if you find examples, the fact that there exist examples
doesn't mean it's the right thing to do.

Thanks,
Ezequiel


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