linux-kernel - Re: [PATCH v5 1/2] dt-binding: misc: Add iop yaml file for Sunplus SP7021

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Date:   Mon, 27 Dec 2021 12:43:37 -0400
From:   Rob Herring <robh@...nel.org>
To:     Tony Huang <tonyhuang.sunplus@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        derek.kiernan@...inx.com, dragan.cvetic@...inx.com, arnd@...db.de,
        gregkh@...uxfoundation.org, tony.huang@...plus.com,
        wells.lu@...plus.com
Subject: Re: [PATCH v5 1/2] dt-binding: misc: Add iop yaml file for Sunplus
 SP7021

On Fri, Dec 24, 2021 at 04:35:55PM +0800, Tony Huang wrote:
> Add iop yaml file for Sunplus SP7021
> 
> Signed-off-by: Tony Huang <tonyhuang.sunplus@...il.com>
> ---
> Changes in v5:
> -Add iop-wakeup pin for 8051 to wake up the Linux kernel in shutdown mode.
> 
>  .../devicetree/bindings/misc/sunplus-iop.yaml      | 72 ++++++++++++++++++++++
>  MAINTAINERS                                        |  5 ++
>  2 files changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/sunplus-iop.yaml
> 
> diff --git a/Documentation/devicetree/bindings/misc/sunplus-iop.yaml b/Documentation/devicetree/bindings/misc/sunplus-iop.yaml
> new file mode 100644
> index 0000000..fad0f50
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/sunplus-iop.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) Sunplus Ltd. Co. 2021
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/sunplus-iop.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sunplus IOP(8051) controller
> +
> +maintainers:
> +  - Tony Huang <tonyhuang.sunplus@...il.com>
> +
> +description: |
> +  Processor for I/O control, RTC wake-up procedure management,
> +  and cooperation with CPU&PMC in power management.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - sunplus,sp7021-iop
> +
> +  reg:
> +    items:
> +      - description: IOP registers regions
> +      - description: PMC registers regions
> +      - description: MOON0 registers regions
> +
> +  reg-names:
> +    items:
> +      - const: iop
> +      - const: iop_pmc
> +      - const: moon0
> +
> +  interrupts:
> +    items:
> +      - description: IOP_INT0. IOP to system Interrupt 0.
> +                     Sent by IOP to system RISC.
> +      - description: IOP_INT1. IOP to System Interrupt 1.
> +                     Sent by IOP to system RISC.
> +
> +  memory-region:
> +    maxItems: 1
> +
> +  iop-wakeup:
> +    description: Notify 8051 to wake up the Linux kernel.

What does that mean? What's the type? Does the standard 'wakeup-source' 
property not work here?

> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - memory-region
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    iop: iop@...00400 {
> +        compatible = "sunplus,sp7021-iop";
> +        reg = <0x9c000400 0x80>, <0x9c003100 0x80>, <0x9c000000 0x80>;
> +        reg-names = "iop", "iop_pmc", "moon0";
> +        interrupt-parent = <&intc>;
> +        interrupts = <41 IRQ_TYPE_LEVEL_HIGH>, <42 IRQ_TYPE_LEVEL_HIGH>;
> +        memory-region = <&iop_reserve>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&iop_pins>;
> +        iop-wakeup = <&pctl 1 GPIO_ACTIVE_HIGH>;

That's not how the GPIO binding works.

> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3b79fd4..071b5e6 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -17945,6 +17945,11 @@ L:	netdev@...r.kernel.org
>  S:	Maintained
>  F:	drivers/net/ethernet/dlink/sundance.c
>  
> +SUNPLUS IOP DRIVER
> +M:	Tony Huang <tonyhuang.sunplus@...il.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/misc/sunplu-iop.yaml
> +
>  SUPERH
>  M:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
>  M:	Rich Felker <dalias@...c.org>
> -- 
> 2.7.4
> 
>