[v2,01/21] dt-bindings: aspeed-lpc: Remove LPC partitioning

From: "Chia-Wei, Wang" <chiawei_wang@aspeedtech.com>

The LPC controller has no concept of the BMC and the Host partitions.
This patch fixes the documentation by removing the description on LPC
partitions. The register offsets illustrated in the DTS node examples
are also fixed to adapt to the LPC DTS change.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
 .../devicetree/bindings/mfd/aspeed-lpc.txt    | 100 +++++-------------
 1 file changed, 25 insertions(+), 75 deletions(-)

On Fri, 19 Mar 2021 at 06:28, Andrew Jeffery <andrew@aj.id.au> wrote:
>
> From: "Chia-Wei, Wang" <chiawei_wang@aspeedtech.com>
>
> The LPC controller has no concept of the BMC and the Host partitions.
> This patch fixes the documentation by removing the description on LPC
> partitions. The register offsets illustrated in the DTS node examples
> are also fixed to adapt to the LPC DTS change.

Is this accurate:

 The node examples change their reg address to be an offset from the
LPC HC to be an offset from the base of the LPC region.

Reviewed-by: Joel Stanley <joel@jms.id.au>

>
> Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
> Acked-by: Rob Herring <robh@kernel.org>
> Acked-by: Lee Jones <lee.jones@linaro.org>
> ---
>  .../devicetree/bindings/mfd/aspeed-lpc.txt    | 100 +++++-------------
>  1 file changed, 25 insertions(+), 75 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> index d0a38ba8b9ce..936aa108eab4 100644
> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> @@ -9,13 +9,7 @@ primary use case of the Aspeed LPC controller is as a slave on the bus
>  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 it provides. The principle split is between the register
> -layout at the start of the I/O space which is, to quote the Aspeed datasheet,
> -"basically compatible with the [LPC registers from the] popular BMC controller
> -H8S/2168[1]", and everything else, where everything else is an eclectic
> -collection of functions with a esoteric register layout. "Everything else",
> -here labeled the "host" portion of the controller, includes, but is not limited
> -to:
> +mix of functionality, which includes, but is not limited to:
>
>  * An IPMI Block Transfer[2] Controller
>
> @@ -44,80 +38,36 @@ Required properties
>  ===================
>
>  - compatible:  One of:
> -               "aspeed,ast2400-lpc", "simple-mfd"
> -               "aspeed,ast2500-lpc", "simple-mfd"
> -               "aspeed,ast2600-lpc", "simple-mfd"
> +               "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
> -
> -Required LPC Child nodes
> -========================
> -
> -BMC Node
> ---------
> -
> -- compatible:  One of:
> -               "aspeed,ast2400-lpc-bmc"
> -               "aspeed,ast2500-lpc-bmc"
> -               "aspeed,ast2600-lpc-bmc"
> -
> -- reg:         contains the physical address and length values of the
> -                H8S/2168-compatible LPC controller memory region
> -
> -Host Node
> ----------
> -
> -- compatible:   One of:
> -               "aspeed,ast2400-lpc-host", "simple-mfd", "syscon"
> -               "aspeed,ast2500-lpc-host", "simple-mfd", "syscon"
> -               "aspeed,ast2600-lpc-host", "simple-mfd", "syscon"
> -
> -- reg:         contains the address and length values of the host-related
> -                register space for the Aspeed LPC controller
> -
> -- #address-cells: <1>
> -- #size-cells: <1>
> -- ranges:      Maps 0 to the address and length of the host-related LPC memory
> +- ranges:      Maps 0 to the physical address and length of the LPC memory
>                  region
>
>  Example:
>
>  lpc: lpc@1e789000 {
> -       compatible = "aspeed,ast2500-lpc", "simple-mfd";
> +       compatible = "aspeed,ast2500-lpc-v2", "simple-mfd", "syscon";
>         reg = <0x1e789000 0x1000>;
>
>         #address-cells = <1>;
>         #size-cells = <1>;
>         ranges = <0x0 0x1e789000 0x1000>;
>
> -       lpc_bmc: lpc-bmc@0 {
> -               compatible = "aspeed,ast2500-lpc-bmc";
> +       lpc_snoop: lpc-snoop@0 {
> +               compatible = "aspeed,ast2600-lpc-snoop";
>                 reg = <0x0 0x80>;
> -       };
> -
> -       lpc_host: lpc-host@80 {
> -               compatible = "aspeed,ast2500-lpc-host", "simple-mfd", "syscon";
> -               reg = <0x80 0x1e0>;
> -               reg-io-width = <4>;
> -
> -               #address-cells = <1>;
> -               #size-cells = <1>;
> -               ranges = <0x0 0x80 0x1e0>;
> +               interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
> +               snoop-ports = <0x80>;
>         };
>  };
>
> -BMC Node Children
> -==================
> -
> -
> -Host Node Children
> -==================
>
>  LPC Host Interface Controller
>  -------------------
> @@ -149,14 +99,12 @@ Optional properties:
>
>  Example:
>
> -lpc-host@80 {
> -       lpc_ctrl: lpc-ctrl@0 {
> -               compatible = "aspeed,ast2500-lpc-ctrl";
> -               reg = <0x0 0x80>;
> -               clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
> -               memory-region = <&flash_memory>;
> -               flash = <&spi>;
> -       };
> +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
> @@ -179,9 +127,9 @@ Required properties:
>
>  Example:
>
> -lhc: lhc@20 {
> +lhc: lhc@a0 {
>         compatible = "aspeed,ast2500-lhc";
> -       reg = <0x20 0x24 0x48 0x8>;
> +       reg = <0xa0 0x24 0xc8 0x8>;
>  };
>
>  LPC reset control
> @@ -192,16 +140,18 @@ state of the LPC bus. Some systems may chose to modify this configuration.
>
>  Required properties:
>
> - - compatible:         "aspeed,ast2600-lpc-reset" or
> -                       "aspeed,ast2500-lpc-reset"
> -                       "aspeed,ast2400-lpc-reset"
> + - 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@18 {
> +lpc_reset: reset-controller@98 {
>          compatible = "aspeed,ast2500-lpc-reset";
> -        reg = <0x18 0x4>;
> +        reg = <0x98 0x4>;
>          #reset-cells = <1>;
>  };
> --
> 2.27.0
>

On Fri, 9 Apr 2021, at 12:48, Joel Stanley wrote:
> On Fri, 19 Mar 2021 at 06:28, Andrew Jeffery <andrew@aj.id.au> wrote:
> >
> > From: "Chia-Wei, Wang" <chiawei_wang@aspeedtech.com>
> >
> > The LPC controller has no concept of the BMC and the Host partitions.
> > This patch fixes the documentation by removing the description on LPC
> > partitions. The register offsets illustrated in the DTS node examples
> > are also fixed to adapt to the LPC DTS change.
> 
> Is this accurate:
> 
>  The node examples change their reg address to be an offset from the
> LPC HC to be an offset from the base of the LPC region.

Everything becomes based from the start of the LPC region, yes.

Andrew