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Message-ID: <HK0PR06MB3779F21A233D4B02824E5FB091160@HK0PR06MB3779.apcprd06.prod.outlook.com>
Date: Tue, 27 Oct 2020 07:14:47 +0000
From: ChiaWei Wang <chiawei_wang@...eedtech.com>
To: Andrew Jeffery <andrew@...id.au>, Rob Herring <robh+dt@...nel.org>,
Joel Stanley <joel@....id.au>
CC: Ryan Chen <ryan_chen@...eedtech.com>,
Lee Jones <lee.jones@...aro.org>,
Corey Minyard <minyard@....org>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linus Walleij <linus.walleij@...aro.org>,
Haiyue Wang <haiyue.wang@...ux.intel.com>,
Cyril Bur <cyrilbur@...il.com>,
Robert Lippert <rlippert@...gle.com>,
"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>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: RE: [PATCH v2 5/5] dt-bindings: aspeed-lpc: Remove LPC partitioning
Hi Andrew,
> -----Original Message-----
> From: Andrew Jeffery <andrew@...id.au>
> Sent: Monday, October 26, 2020 11:12 AM
> To: ChiaWei Wang <chiawei_wang@...eedtech.com>; Rob Herring
> <robh+dt@...nel.org>; Joel Stanley <joel@....id.au>
> Subject: Re: [PATCH v2 5/5] dt-bindings: aspeed-lpc: Remove LPC partitioning
>
> Hi Wang Chia-Wei,
>
> On Mon, 5 Oct 2020, at 18:58, 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>
>
> The documentation at [1] suggests this should probably be patch 1/5 rather
> than 5/5, so if you send the series again I'd probably rearrange it. Following the
> steps outlined in [1] helps catch Rob's attention in the right way :)
>
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Docume
> ntation/devicetree/bindings/submitting-patches.rst?h=v5.9
Thanks for pointing out the guideline.
I will rearrange the commits if v3 change is requested.
>
> Rob:
>
> The changes here go some way towards cleaning up mistakes I made in the
> Aspeed LPC controller binding. The proposed change is very much not
> backwards compatible, but Joel and I don't want to live with the resulting mess
> in the drivers of catering to both layouts. Another way we could avoid the
> driver mess is to rev all the bindings and immediately drop support for the old
> compatibles in the drivers. This creates a bit more churn in the bindings. What
> are you willing to accommodate?
>
> All consumers I'm aware of ship the Aspeed BMC dtb in FIT images alongside
> the kernel, so while backwards-incompatible changes are rightly frowned upon
> I feel we probably wouldn't cause too much damage if we went that path.
>
> Andrew
>
> > ---
> > .../devicetree/bindings/mfd/aspeed-lpc.txt | 85 +++----------------
> > 1 file changed, 14 insertions(+), 71 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> > b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> > index a92acf1dd491..866f54a09e09 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
> >
> > @@ -44,8 +38,8 @@ Required properties
> > ===================
> >
> > - compatible: One of:
> > - "aspeed,ast2400-lpc", "simple-mfd"
> > - "aspeed,ast2500-lpc", "simple-mfd"
> > + "aspeed,ast2400-lpc", "simple-mfd", "syscon"
> > + "aspeed,ast2500-lpc", "simple-mfd", "syscon"
> >
> > - reg: contains the physical address and length values of the Aspeed
> > LPC memory region.
> > @@ -55,66 +49,17 @@ Required properties
> > - 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"
> > -
> > -- 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"
> > -
> > -- 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
> > - region
> > -
> > Example:
> >
> > lpc: lpc@...89000 {
> > - compatible = "aspeed,ast2500-lpc", "simple-mfd";
> > + compatible = "aspeed,ast2500-lpc", "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";
> > - 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
> > -------------------
> > @@ -145,14 +90,12 @@ 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
> > @@ -174,9 +117,9 @@ 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
> > @@ -194,8 +137,8 @@ Required properties:
> >
> > 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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