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Message-ID: <c6d8c1f2-082d-43c1-8768-c0004d3fe386@linaro.org>
Date: Tue, 19 Dec 2023 08:40:23 +0100
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Subject: Re: [PATCH 1/4] dt-bindings: reset: mobileye,eyeq5-reset: add
 bindings
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To: =?UTF-8?Q?Th=C3=A9o_Lebrun?= <theo.lebrun@bootlin.com>,
 Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>,
 Gregory CLEMENT <gregory.clement@bootlin.com>,
 Philipp Zabel <p.zabel@pengutronix.de>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Thomas Petazzoni
 <thomas.petazzoni@bootlin.com>, Tawfik Bayouk <tawfik.bayouk@mobileye.com>
References: <20231218-mbly-reset-v1-0-b4688b916213@bootlin.com>
 <20231218-mbly-reset-v1-1-b4688b916213@bootlin.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20231218-mbly-reset-v1-1-b4688b916213@bootlin.com>
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On 18/12/2023 18:16, Théo Lebrun wrote:
> Add DT-Schema bindings for the EyeQ5 reset controller.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
> ---
>  .../bindings/reset/mobileye,eyeq5-reset.yaml       | 69 +++++++++++++++++++
>  MAINTAINERS                                        |  2 +
>  include/dt-bindings/reset/mobileye,eyeq5-reset.h   | 80 ++++++++++++++++++++++
>  3 files changed, 151 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/reset/mobileye,eyeq5-reset.yaml b/Documentation/devicetree/bindings/reset/mobileye,eyeq5-reset.yaml
> new file mode 100644
> index 000000000000..cab6a75ba59d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reset/mobileye,eyeq5-reset.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reset/mobileye,eyeq5-reset.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mobileye EyeQ5 reset controller
> +
> +description:
> +  The EyeQ5 reset driver handles three reset domains. It is custom to this
> +  platform, its registers live in a shared region called OLB.
> +
> +maintainers:
> +  - Grégory Clement <gregory.clement@bootlin.com>
> +  - Théo Lebrun <theo.lebrun@bootlin.com>
> +  - Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
> +
> +properties:
> +  $nodename:
> +    pattern: "^reset-controller$"
> +    description:
> +      We have no unique address, we rely on OLB.

NAK, third time.

> +
> +  compatible:
> +    const: mobileye,eyeq5-reset
> +
> +  "#reset-cells":
> +    const: 2
> +    description:
> +      The first cell is the domain (0 to 2 inclusive) and the second one is the
> +      reset index inside that domain.
> +
> +  mobileye,olb:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      A phandle to the OLB syscon. This is a fallback to using the parent as
> +      syscon node.

No, the same rationale as before.

> +
> +required:
> +  - compatible
> +  - "#reset-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    olb@e00000 {
> +      compatible = "mobileye,eyeq5-olb", "syscon", "simple-mfd";

No, the same rationale as before.


> +      reg = <0xe00000 0x400>;
> +      reg-io-width = <4>;
> +
> +      reset-controller {
> +        compatible = "mobileye,eyeq5-reset";
> +        #reset-cells = <2>;
> +      };
> +    };
> +
> +  - |
> +    olb: olb@e00000 {
> +      compatible = "mobileye,eyeq5-olb", "syscon", "simple-mfd";

No, the same rationale as before. The hardware is either A or B, not both.


> +      reg = <0xe00000 0x400>;
> +      reg-io-width = <4>;
> +    };
> +
> +    reset-controller {
> +      compatible = "mobileye,eyeq5-reset";
> +      #reset-cells = <2>;
> +      mobileye,olb = <&olb>;
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4a7bd6b40d74..9096a940b425 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14553,9 +14553,11 @@ M:	Théo Lebrun <theo.lebrun@bootlin.com>
>  L:	linux-mips@vger.kernel.org
>  S:	Maintained
>  F:	Documentation/devicetree/bindings/mips/mobileye.yaml
> +F:	Documentation/devicetree/bindings/reset/mobileye,eyeq5-reset.yaml
>  F:	arch/mips/boot/dts/mobileye/
>  F:	arch/mips/configs/generic/board-eyeq5.config
>  F:	arch/mips/generic/board-epm5.its.S
> +F:	include/dt-bindings/reset/mobileye,eyeq5-reset.h
>  F:	include/dt-bindings/soc/mobileye,eyeq5.h
>  
>  MODULE SUPPORT
> diff --git a/include/dt-bindings/reset/mobileye,eyeq5-reset.h b/include/dt-bindings/reset/mobileye,eyeq5-reset.h
> new file mode 100644
> index 000000000000..ce59fe5409ac
> --- /dev/null
> +++ b/include/dt-bindings/reset/mobileye,eyeq5-reset.h
> @@ -0,0 +1,80 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * Copyright (C) 2023 Mobileye Vision Technologies Ltd.
> + */
> +
> +#ifndef _DT_BINDINGS_RESET_MOBILEYE_EYEQ5_RESET_H
> +#define _DT_BINDINGS_RESET_MOBILEYE_EYEQ5_RESET_H
> +
> +/* Domain 0 */
> +
> +/* 0..2 are reserved */

No, they are not. IDs cannot be reserved. IDs start from 0 and are
incremented by 1. Reserving an ID contradicts to entire point of that
ID, so either drop entire file or make this proper IDs.

> +#define EQ5R_D0_CAN0				3
> +#define EQ5R_D0_CAN1				4
> +#define EQ5R_D0_CAN2				5
> +#define EQ5R_D0_SPI0				6
> +#define EQ5R_D0_SPI1				7
> +#define EQ5R_D0_SPI2				8
> +#define EQ5R_D0_SPI3				9

...

> +
> +#define EQ5R_D2_MULTIPHY_SWRST_DIS		12
> +#define EQ5R_D2_MULTIPHY_APB_RST_DIS		13
> +/* 14 is refclk select, ie not a reset */
> +#define EQ5R_D2_PCIE0_LINK_MGMT_RST		15
> +#define EQ5R_D2_PCIE1_LINK_MGMT_RST		16
> +#define EQ5R_D2_PCIE0_LINK_PM_RST		17
> +#define EQ5R_D2_PCIE1_LINK_PM_RST		18
> +/* 19..31 are unknown */

No, they are not unknown. They are explicitly implemented by driver or
these are not IDs.

Best regards,
Krzysztof