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Message-ID: <20240129-garnet-polar-65afd461a1c6@spud>
Date: Mon, 29 Jan 2024 15:37:08 +0000
From: Conor Dooley <conor@...nel.org>
To: William Qiu <william.qiu@...rfivetech.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org, linux-can@...r.kernel.org,
Emil Renner Berthing <kernel@...il.dk>,
Rob Herring <robh+dt@...nel.org>,
Wolfgang Grandegger <wg@...ndegger.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Marc Kleine-Budde <mkl@...gutronix.de>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v1 2/4] dt-bindings: can: Add bindings for CAST CAN
Controller
Hey William,
On Mon, Jan 29, 2024 at 11:12:37AM +0800, William Qiu wrote:
> Add bindings for CAST CAN Controller
>
> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
> ---
> .../devicetree/bindings/net/can/cast,can.yaml | 95 +++++++++++++++++++
> 1 file changed, 95 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/can/cast,can.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/can/cast,can.yaml b/Documentation/devicetree/bindings/net/can/cast,can.yaml
> new file mode 100644
> index 000000000000..ea52132d9b1c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/can/cast,can.yaml
> @@ -0,0 +1,95 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/can/cast,can.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CAST CAN controller
> +
> +maintainers:
> + - William Qiu <william.qiu@...rfivetech.com>
> +
> +allOf:
> + - $ref: can-controller.yaml#
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: starfive,can
> + then:
> + required:
> + - starfive,syscon
If you've got property related stuff in the allOf, move it down after
the property definitions.
> +properties:
> + compatible:
> + enum:
> + - cast,can
> + - cast,canfd
I don't like these uber generic compatibles that have no users as a
fallback. Allowing them in the binding only really discourages people
from creating device specific compatibles.
Secondly, this is some purchased IP that I am sure has a versioning
scheme and the compatibles that you have created do not reflect that.
If they were being used as a fallback, I would request some versioning.
That's not going to really work though since the canfd features on the
jh7110 require setting u0_can_ctrl_can_fd_enable, so neither of these
compatibles really has a use right now.
> + - starfive,can
Just "starfive,can"? Can you please add device specific compatibles for
the SoCs on which this is used?
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + clocks:
> + minItems: 3
> +
> + clock-names:
> + items:
> + - const: apb_clk
> + - const: timer_clk
> + - const: can_clk
Drop _clk, they're all clocks!
> +
> + resets:
> + minItems: 3
> +
> + reset-names:
> + items:
> + - const: rst_apb
> + - const: rst_core
> + - const: rst_timer
Same here, drop rst_
> +
> + starfive,syscon:
> + $ref: /schemas/types.yaml#/definitions/phandle-array
> + items:
> + - items:
> + - description: phandle to System Register Controller syscon node
> + - description: offset of SYS_SYSCON_NE__SAIF__SYSCFG register for CAN controller
The docs I have call this register "SYS_SYSCONSAIF__SYSCFG". Did the
names change since the TRM I have was written?
> + - description: shift of SYS_SYSCON_NE__SAIF__SYSCFG register for CAN controller
> + - description: mask of SYS_SYSCON_NE__SAIF__SYSCFG register for CAN controller
> + description:
> + Should be four parameters, the phandle to System Register Controller
> + syscon node and the offset/shift/mask of SYS_SYSCON_NE__SAIF__SYSCFG register
> + for CAN controller.
Cheers,
Conor.
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