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

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Date:   Wed, 29 Dec 2021 01:57:32 +0000
From:   Tony Huang 黃懷厚 <tony.huang@...plus.com>
To:     Rob Herring <robh@...nel.org>,
        Tony Huang <tonyhuang.sunplus@...il.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "derek.kiernan@...inx.com" <derek.kiernan@...inx.com>,
        "dragan.cvetic@...inx.com" <dragan.cvetic@...inx.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>
Subject: RE: [PATCH v5 1/2] dt-binding: misc: Add iop yaml file for Sunplus
 SP7021

Dear Rob:

> 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?
> 

When mounting IOP (8051). We can assign a gpio pin to 8051.
When the linux kernel system is powered off. 8051 is always powered.
8051 can receive external signals according to this gpio pin .
8051 receives external signal through gpio pin. 8051 can power on linux kernel system.

> > +
> > +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
> >
> >