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From: ChiaWei Wang <chiawei_wang@aspeedtech.com>
To: Rob Herring <robh@kernel.org>
Subject: RE: [PATCH v5 1/4] dt-bindings: mfd: aspeed-lpc: Convert to YAML
 schema
Thread-Topic: [PATCH v5 1/4] dt-bindings: mfd: aspeed-lpc: Convert to YAML
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Date: Wed, 22 Sep 2021 05:54:53 +0000
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Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
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Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org
Sender: "openbmc"
 <openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org>

Hi Rob,

> From: Rob Herring <robh@kernel.org>
> Sent: Thursday, September 16, 2021 10:32 PM
>=20
> On Thu, Sep 16, 2021 at 05:25:12PM +0800, Chia-Wei Wang wrote:
> > Convert the bindings of Aspeed LPC from text file into YAML schema.
> >
> > Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> > ---
> >  .../devicetree/bindings/mfd/aspeed-lpc.txt    | 157 ---------------
> >  .../devicetree/bindings/mfd/aspeed-lpc.yaml   | 187
> ++++++++++++++++++
> >  2 files changed, 187 insertions(+), 157 deletions(-)  delete mode
> > 100644 Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> >  create mode 100644
> > Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> > b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> > deleted file mode 100644
> > index 936aa108eab4..000000000000
> > --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> > +++ /dev/null
> > @@ -1,157 +0,0 @@
> >
> -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =3D=3D=3D=3D=3D=3D
> > =3D -Device tree bindings for the Aspeed Low Pin Count (LPC) Bus
> > Controller
> >
> -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =3D=3D=3D=3D=3D=3D
> > =3D
> > -
> > -The LPC bus is a means to bridge a host CPU to a number of
> > low-bandwidth -peripheral devices, replacing the use of the ISA bus in
> > the age of PCI[0]. The -primary use case of the Aspeed LPC controller
> > is as a slave on the bus -(typically in a Baseboard Management
> > Controller SoC), but under certain -conditions it can also take the rol=
e of bus
> master.
> > -
> > -The LPC controller is represented as a multi-function device to
> > account for the -mix of functionality, which includes, but is not limit=
ed to:
> > -
> > -* An IPMI Block Transfer[2] Controller
> > -
> > -* An LPC Host Controller: Manages LPC functions such as host vs slave
> > mode, the
> > -  physical properties of some LPC pins, configuration of serial IRQs,
> > and
> > -  APB-to-LPC bridging amonst other functions.
> > -
> > -* An LPC Host Interface Controller: Manages functions exposed to the
> > host such
> > -  as LPC firmware hub cycles, configuration of the LPC-to-AHB
> > mapping, UART
> > -  management and bus snoop configuration.
> > -
> > -* A set of SuperIO[3] scratch registers: Enables implementation of
> > e.g. custom
> > -  hardware management protocols for handover between the host and
> > baseboard
> > -  management controller.
> > -
> > -Additionally the state of the LPC controller influences the pinmux
> > -configuration, therefore the host portion of the controller is
> > exposed as a -syscon as a means to arbitrate access.
> > -
> > -[0] http://www.intel.com/design/chipsets/industry/25128901.pdf
> > -[1]
> >
> https://www.renesas.com/en-sg/doc/products/mpumcu/001/rej09b0078_h8s2
> 1
> > 68.pdf?key=3D7c88837454702128622bee53acbda8f4
> > -[2]
> >
> https://www.intel.com/content/dam/www/public/us/en/documents/product-b
> > riefs/ipmi-second-gen-interface-spec-v2-rev1-1.pdf
> > -[3] https://en.wikipedia.org/wiki/Super_I/O
> > -
> > -Required properties
> > -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > -
> > -- compatible:	One of:
> > -		"aspeed,ast2400-lpc-v2", "simple-mfd", "syscon"
> > -		"aspeed,ast2500-lpc-v2", "simple-mfd", "syscon"
> > -		"aspeed,ast2600-lpc-v2", "simple-mfd", "syscon"
> > -
> > -- reg:		contains the physical address and length values of the Aspeed
> > -                LPC memory region.
> > -
> > -- #address-cells: <1>
> > -- #size-cells:	<1>
> > -- ranges:	Maps 0 to the physical address and length of the LPC memory
> > -                region
> > -
> > -Example:
> > -
> > -lpc: lpc@1e789000 {
> > -	compatible =3D "aspeed,ast2500-lpc-v2", "simple-mfd", "syscon";
> > -	reg =3D <0x1e789000 0x1000>;
> > -
> > -	#address-cells =3D <1>;
> > -	#size-cells =3D <1>;
> > -	ranges =3D <0x0 0x1e789000 0x1000>;
> > -
> > -	lpc_snoop: lpc-snoop@0 {
> > -		compatible =3D "aspeed,ast2600-lpc-snoop";
> > -		reg =3D <0x0 0x80>;
> > -		interrupts =3D <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
> > -		snoop-ports =3D <0x80>;
> > -	};
> > -};
> > -
> > -
> > -LPC Host Interface Controller
> > --------------------
> > -
> > -The LPC Host Interface Controller manages functions exposed to the
> > host such as -LPC firmware hub cycles, configuration of the LPC-to-AHB
> > mapping, UART -management and bus snoop configuration.
> > -
> > -Required properties:
> > -
> > -- compatible:	One of:
> > -		"aspeed,ast2400-lpc-ctrl";
> > -		"aspeed,ast2500-lpc-ctrl";
> > -		"aspeed,ast2600-lpc-ctrl";
> > -
> > -- reg:		contains offset/length values of the host interface controller
> > -		memory regions
> > -
> > -- clocks:	contains a phandle to the syscon node describing the clocks.
> > -		There should then be one cell representing the clock to use
> > -
> > -Optional properties:
> > -
> > -- memory-region: A phandle to a reserved_memory region to be used for
> the LPC
> > -		to AHB mapping
> > -
> > -- flash:	A phandle to the SPI flash controller containing the flash to
> > -		be exposed over the LPC to AHB mapping
> > -
> > -Example:
> > -
> > -lpc_ctrl: lpc-ctrl@80 {
> > -	compatible =3D "aspeed,ast2500-lpc-ctrl";
> > -	reg =3D <0x80 0x80>;
> > -	clocks =3D <&syscon ASPEED_CLK_GATE_LCLK>;
> > -	memory-region =3D <&flash_memory>;
> > -	flash =3D <&spi>;
> > -};
> > -
> > -LPC Host Controller
> > --------------------
> > -
> > -The Aspeed LPC Host Controller configures the Low Pin Count (LPC) bus
> > behaviour -between the host and the baseboard management controller.
> > The registers exist -in the "host" portion of the Aspeed LPC
> > controller, which must be the parent of -the LPC host controller node.
> > -
> > -Required properties:
> > -
> > -- compatible:	One of:
> > -		"aspeed,ast2400-lhc";
> > -		"aspeed,ast2500-lhc";
> > -		"aspeed,ast2600-lhc";
> > -
> > -- reg:		contains offset/length values of the LHC memory regions. In th=
e
> > -		AST2400 and AST2500 there are two regions.
> > -
> > -Example:
> > -
> > -lhc: lhc@a0 {
> > -	compatible =3D "aspeed,ast2500-lhc";
> > -	reg =3D <0xa0 0x24 0xc8 0x8>;
> > -};
> > -
> > -LPC reset control
> > ------------------
> > -
> > -The UARTs present in the ASPEED SoC can have their resets tied to the
> > reset -state of the LPC bus. Some systems may chose to modify this
> configuration.
> > -
> > -Required properties:
> > -
> > - - compatible:		One of:
> > -			"aspeed,ast2600-lpc-reset";
> > -			"aspeed,ast2500-lpc-reset";
> > -			"aspeed,ast2400-lpc-reset";
> > -
> > - - reg:			offset and length of the IP in the LHC memory region
> > - - #reset-controller	indicates the number of reset cells expected
> > -
> > -Example:
> > -
> > -lpc_reset: reset-controller@98 {
> > -        compatible =3D "aspeed,ast2500-lpc-reset";
> > -        reg =3D <0x98 0x4>;
> > -        #reset-cells =3D <1>;
> > -};
> > diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
> > b/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
> > new file mode 100644
> > index 000000000000..54f080df5e2f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
> > @@ -0,0 +1,187 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) # #
> > +Copyright (c) 2021 Aspeed Tehchnology Inc.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mfd/aspeed-lpc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Aspeed Low Pin Count (LPC) Bus Controller
> > +
> > +maintainers:
> > +  - Andrew Jeffery <andrew@aj.id.au>
> > +  - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> > +
> > +description:
> > +  The LPC bus is a means to bridge a host CPU to a number of
> > +low-bandwidth
> > +  peripheral devices, replacing the use of the ISA bus in the age of
> > +PCI[0]. The
> > +  primary use case of the Aspeed LPC controller is as a slave on the
> > +bus
> > +  (typically in a Baseboard Management Controller SoC), but under
> > +certain
> > +  conditions it can also take the role of bus master.
> > +
> > +  The LPC controller is represented as a multi-function device to
> > + account for the  mix of functionality, which includes, but is not
> > + limited to
> > +
> > +  * An IPMI Block Transfer[2] Controller
> > +
> > +  * An LPC Host Interface Controller manages functions exposed to the =
host
> such
> > +    as LPC firmware hub cycles, configuration of the LPC-to-AHB mappin=
g,
> UART
> > +    management and bus snoop configuration.
> > +
> > +  * A set of SuperIO[3] scratch registers enableing implementation of =
e.g.
> custom
> > +    hardware management protocols for handover between the host and
> baseboard
> > +    management controller.
> > +
> > +  Additionally the state of the LPC controller influences the pinmux
> > + configuration, therefore the host portion of the controller is
> > + exposed as a  syscon as a means to arbitrate access.
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - aspeed,ast2400-lpc-v2
> > +          - aspeed,ast2500-lpc-v2
> > +          - aspeed,ast2600-lpc-v2
> > +      - const: simple-mfd
> > +      - const: syscon
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  "#address-cells":
> > +    const: 1
> > +
> > +  "#size-cells":
> > +    const: 1
> > +
> > +  ranges: true
> > +
> > +patternProperties:
> > +  "^lpc-ctrl@[0-9a-f]+$":
> > +    type: object
> > +
> > +    description:
> > +      The LPC Host Interface Controller manages functions exposed to t=
he
> host such as
> > +      LPC firmware hub cycles, configuration of the LPC-to-AHB mapping=
,
> UART management
> > +      and bus snoop configuration.
> > +
> > +    properties:
> > +      compatible:
> > +        items:
> > +          - enum:
> > +              - aspeed,ast2400-lpc-ctrl
> > +              - aspeed,ast2500-lpc-ctrl
> > +              - aspeed,ast2600-lpc-ctrl
> > +
> > +      reg:
> > +        maxItems: 1
> > +
> > +      clocks:
> > +        maxItems: 1
> > +
> > +      memory-region:
> > +        $ref: /schemas/types.yaml#/definitions/phandle
> > +        description: A reserved_memory region to be used for the LPC
> > + to AHB mapping
> > +
> > +      flash:
> > +        $ref: /schemas/types.yaml#/definitions/phandle
> > +        description: The SPI flash controller containing the flash to
> > + be exposed over the LPC to AHB mapping
> > +
> > +    required:
> > +      - compatible
> > +      - clocks
> > +
> > +  "^reset-controller@[0-9a-f]+$":
> > +    type: object
> > +
> > +    description:
> > +      The UARTs present in the ASPEED SoC can have their resets tied t=
o
> the reset
> > +      state of the LPC bus. Some systems may chose to modify this
> > + configuration
> > +
> > +    properties:
> > +      compatible:
> > +        items:
> > +          - enum:
> > +              - aspeed,ast2400-lpc-reset
> > +              - aspeed,ast2500-lpc-reset
> > +              - aspeed,ast2600-lpc-reset
> > +
> > +      reg:
> > +        maxItems: 1
> > +
> > +    required:
> > +      - compatible
> > +
> > +  "^lpc-snoop@[0-9a-f]+$":
> > +    type: object
> > +
> > +    description:
> > +      The LPC snoop interface allows the BMC to listen on and record t=
he
> data
> > +      bytes written by the Host to the targeted LPC I/O pots.
> > +
> > +    properties:
> > +      comptabile:
>=20
> I guess I have to point out *every* instance of your typo?
>=20
> Run 'make dt_binding_check' and find these problems before you send this
> out.

Sorry for making this error again.
I missed the "DT_CHECKER_FLAGS=3D-m" command line argument and thus the war=
ning did not show up.
Will keep in mind next time. Thanks for your help.

Chiawei