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Message-ID: <HK0PR06MB3779F1ECFA191A583732E95E91A29@HK0PR06MB3779.apcprd06.prod.outlook.com>
Date: Wed, 22 Sep 2021 05:54:53 +0000
From: ChiaWei Wang <chiawei_wang@...eedtech.com>
To: Rob Herring <robh@...nel.org>
CC: "joel@....id.au" <joel@....id.au>,
"andrew@...id.au" <andrew@...id.au>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
"osk@...gle.com" <osk@...gle.com>,
"yulei.sh@...edance.com" <yulei.sh@...edance.com>
Subject: RE: [PATCH v5 1/4] dt-bindings: mfd: aspeed-lpc: Convert to YAML
schema
Hi Rob,
> From: Rob Herring <robh@...nel.org>
> Sent: Thursday, September 16, 2021 10:32 PM
>
> 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@...eedtech.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 @@
> >
> -===============================================================
> ======
> > = -Device tree bindings for the Aspeed Low Pin Count (LPC) Bus
> > Controller
> >
> -===============================================================
> ======
> > =
> > -
> > -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 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=7c88837454702128622bee53acbda8f4
> > -[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
> > -===================
> > -
> > -- 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@...89000 {
> > - compatible = "aspeed,ast2500-lpc-v2", "simple-mfd", "syscon";
> > - reg = <0x1e789000 0x1000>;
> > -
> > - #address-cells = <1>;
> > - #size-cells = <1>;
> > - ranges = <0x0 0x1e789000 0x1000>;
> > -
> > - lpc_snoop: lpc-snoop@0 {
> > - compatible = "aspeed,ast2600-lpc-snoop";
> > - reg = <0x0 0x80>;
> > - interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
> > - snoop-ports = <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 = "aspeed,ast2500-lpc-ctrl";
> > - reg = <0x80 0x80>;
> > - clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
> > - memory-region = <&flash_memory>;
> > - flash = <&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 the
> > - AST2400 and AST2500 there are two regions.
> > -
> > -Example:
> > -
> > -lhc: lhc@a0 {
> > - compatible = "aspeed,ast2500-lhc";
> > - reg = <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 = "aspeed,ast2500-lpc-reset";
> > - reg = <0x98 0x4>;
> > - #reset-cells = <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@...id.au>
> > + - Chia-Wei Wang <chiawei_wang@...eedtech.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 mapping,
> 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 the
> 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 to
> 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 the
> data
> > + bytes written by the Host to the targeted LPC I/O pots.
> > +
> > + properties:
> > + comptabile:
>
> I guess I have to point out *every* instance of your typo?
>
> 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=-m" command line argument and thus the warning did not show up.
Will keep in mind next time. Thanks for your help.
Chiawei
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