On Mon, Sep 13, 2021 at 1:02 AM Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx> wrote: > > Convert the bindings of Aspeed LPC from text file into YAML schema. > > Signed-off-by: Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx> > --- > .../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_h8s2168.pdf?key=7c88837454702128622bee53acbda8f4 > -[2] https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/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@1e789000 { > - 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..4e3862cf2a4b > --- /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@xxxxxxxx> > + - Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx> > + > +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: > + comptabile: typo here. This is the source of your warnings. Rob
