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SubjectRE: [PATCH v5 1/2] dt-binding: misc: Add iop yaml file for Sunplus SP7021
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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@gmail.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@gmail.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@9c000400 {
> > + 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@vger.kernel.org
> > S: Maintained
> > F: drivers/net/ethernet/dlink/sundance.c
> >
> > +SUNPLUS IOP DRIVER
> > +M: Tony Huang <tonyhuang.sunplus@gmail.com>
> > +S: Maintained
> > +F: Documentation/devicetree/bindings/misc/sunplu-iop.yaml
> > +
> > SUPERH
> > M: Yoshinori Sato <ysato@users.sourceforge.jp>
> > M: Rich Felker <dalias@libc.org>
> > --
> > 2.7.4
> >
> >
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