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Message-ID: <20210111203850.GA3022469@robh.at.kernel.org>
Date: Mon, 11 Jan 2021 14:38:50 -0600
From: Rob Herring <robh@...nel.org>
To: "Chia-Wei, Wang" <chiawei_wang@...eedtech.com>
Cc: lee.jones@...aro.org, joel@....id.au, andrew@...id.au,
linus.walleij@...aro.org, minyard@....org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
openbmc@...ts.ozlabs.org, BMC-SW@...eedtech.com,
haiyue.wang@...ux.intel.com, cyrilbur@...il.com,
rlippert@...gle.com
Subject: Re: [PATCH v4 1/5] dt-bindings: aspeed-lpc: Remove LPC partitioning
On Tue, Dec 29, 2020 at 02:31:53PM +0800, Chia-Wei, Wang wrote:
> 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@...eedtech.com>
> ---
> .../devicetree/bindings/mfd/aspeed-lpc.txt | 99 ++++---------------
> 1 file changed, 21 insertions(+), 78 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> index d0a38ba8b9ce..90eb0ecc95d1 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 +38,29 @@ 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@...89000 {
> - 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>;
No child nodes? Then you don't need 'ranges', '#size-cells', nor
'#address-cells'.
> -
> - lpc_bmc: lpc-bmc@0 {
> - compatible = "aspeed,ast2500-lpc-bmc";
> - 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>;
> - };
> };
>
> -BMC Node Children
> -==================
> -
> -
> -Host Node Children
> -==================
>
> LPC Host Interface Controller
> -------------------
> @@ -149,14 +92,12 @@ 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 +120,9 @@ 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 +133,18 @@ 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>;
> };
> --
> 2.17.1
>
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