linux-kernel - Re: [PATCH 2/4] dt-bindings: power: reset: Replace SYSCON reboot-mode legacy bindings with YAML-based one

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Date:   Wed, 11 Mar 2020 23:47:22 +0300
From:   Sergey Semin <Sergey.Semin@...kalelectronics.ru>
To:     Sebastian Reichel <sre@...nel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] dt-bindings: power: reset: Replace SYSCON
 reboot-mode legacy bindings with YAML-based one

On Fri, Mar 06, 2020 at 08:56:38PM +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Mar 06, 2020 at 04:03:39PM +0300, Sergey.Semin@...kalelectronics.ru wrote:
> > From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > 
> > Modern device tree bindings are supposed to be created as YAML-files
> > in accordance with dt-schema. This commit replaces SYSCON reboot-mode
> > legacy bare text bindings with YAML file. As before the bindings file
> > states that the corresponding dts node is supposed to be compatible
> > "syscon-reboot-mode" device and necessarily have an offset property
> > to determine which register from the regmap is supposed to keep the
> > mode on reboot.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Ralf Baechle <ralf@...ux-mips.org>
> > ---
> 
> I'm missing patch 1 and would like an Acked-by from Rob Herring, so
> for now:
> 
> Acked-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> 

Great. Thanks. I'll resend the patchset very soon. You aren't in the
first patch Cc because it doesn't concern power/reset subsystem, but
mfd/syscon. That's why my submission script didn't add you to the list.
Sorry about that. I'll send a v2 copy to you.

Regards,
-Sergey

> -- Sebastian
> 
> >  .../power/reset/syscon-reboot-mode.txt        | 35 ------------
> >  .../power/reset/syscon-reboot-mode.yaml       | 55 +++++++++++++++++++
> >  2 files changed, 55 insertions(+), 35 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
> >  create mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
> > deleted file mode 100644
> > index f7ce1d8af04a..000000000000
> > --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
> > +++ /dev/null
> > @@ -1,35 +0,0 @@
> > -SYSCON reboot mode driver
> > -
> > -This driver gets reboot mode magic value form reboot-mode driver
> > -and stores it in a SYSCON mapped register. Then the bootloader
> > -can read it and take different action according to the magic
> > -value stored.
> > -
> > -This DT node should be represented as a sub-node of a "syscon", "simple-mfd"
> > -node.
> > -
> > -Required properties:
> > -- compatible: should be "syscon-reboot-mode"
> > -- offset: offset in the register map for the storage register (in bytes)
> > -
> > -Optional property:
> > -- mask: bits mask of the bits in the register to store the reboot mode magic value,
> > -  default set to 0xffffffff if missing.
> > -
> > -The rest of the properties should follow the generic reboot-mode description
> > -found in reboot-mode.txt
> > -
> > -Example:
> > -	pmu: pmu@...04000 {
> > -		compatible = "rockchip,rk3066-pmu", "syscon", "simple-mfd";
> > -		reg = <0x20004000 0x100>;
> > -
> > -		reboot-mode {
> > -			compatible = "syscon-reboot-mode";
> > -			offset = <0x40>;
> > -			mode-normal = <BOOT_NORMAL>;
> > -			mode-recovery = <BOOT_RECOVERY>;
> > -			mode-bootloader = <BOOT_FASTBOOT>;
> > -			mode-loader = <BOOT_BL_DOWNLOAD>;
> > -		};
> > -	};
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > new file mode 100644
> > index 000000000000..e09bb07b1abb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > @@ -0,0 +1,55 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/power/reset/syscon-reboot-mode.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Generic SYSCON reboot mode driver
> > +
> > +maintainers:
> > +  - Sebastian Reichel <sre@...nel.org>
> > +
> > +description: |
> > +  This driver gets reboot mode magic value from reboot-mode driver
> > +  and stores it in a SYSCON mapped register. Then the bootloader
> > +  can read it and take different action according to the magic
> > +  value stored. The SYSCON mapped register is retrieved from the
> > +  parental dt-node plus the offset. So the SYSCON reboot-mode node
> > +  should be represented as a sub-node of a "syscon", "simple-mfd" node.
> > +
> > +properties:
> > +  compatible:
> > +    const: syscon-reboot-mode
> > +
> > +  mask:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: Update only the register bits defined by the mask (32 bit).
> > +
> > +  offset:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: Offset in the register map for the mode register (in bytes).
> > +
> > +patternProperties:
> > +  "^mode-.+":
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: Vendor-specific mode value written to the mode register.
> > +
> > +additionalProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - offset
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/soc/rockchip,boot-mode.h>
> > +
> > +    reboot-mode {
> > +      compatible = "syscon-reboot-mode";
> > +      offset = <0x40>;
> > +      mode-normal = <BOOT_NORMAL>;
> > +      mode-recovery = <BOOT_RECOVERY>;
> > +      mode-bootloader = <BOOT_FASTBOOT>;
> > +      mode-loader = <BOOT_BL_DOWNLOAD>;
> > +    };
> > +...
> > -- 
> > 2.25.1
> >