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Subject: Re: [RFC PATCH v2 1/4] dt-bindings: misc: Add bindings for misc. BMC
 control fields
To: Andrew Jeffery <andrew@aj.id.au>, Benjamin Herrenschmidt
 <benh@kernel.crashing.org>, Rob Herring <robh@kernel.org>,
 <Eugene.Cho@dell.com>
CC: Mark Rutland <mark.rutland@arm.com>, <devicetree@vger.kernel.org>, Greg
 Kroah-Hartman <gregkh@linuxfoundation.org>, <linux-kernel@vger.kernel.org>,
 Joel Stanley <joel@jms.id.au>, <stewart@linux.ibm.com>, OpenBMC Maillist
 <openbmc@lists.ozlabs.org>, <linux-arm-kernel@lists.infradead.org>
References: <20180711053122.30773-1-andrew@aj.id.au>
 <20180711053122.30773-2-andrew@aj.id.au>
 <20180711200450.GB17291@rob-hp-laptop>
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 <c69d0e7c3a95d83da87b566a62619462671a233b.camel@kernel.crashing.org>
 <1531967302.2140539.1445583600.0F5ED287@webmail.messagingengine.com>
 <9787b471abc49c0b3db60e3471473a7a5b45ade7.camel@kernel.crashing.org>
 <1532045276.1219110.1446722072.546C1F9D@webmail.messagingengine.com>
From: Alexander Amelkin <a.amelkin@yadro.com>
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From: Alexander Amelkin <a.amelkin@yadro.com>
To: Andrew Jeffery <andrew@aj.id.au>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Rob Herring <robh@kernel.org>, Eugene.Cho@dell.com
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 linux-kernel@vger.kernel.org, Joel Stanley <joel@jms.id.au>,
 stewart@linux.ibm.com, OpenBMC Maillist <openbmc@lists.ozlabs.org>,
 linux-arm-kernel@lists.infradead.org
Message-ID: <81f3d73a-acce-6dad-2e65-49f499c60eb9@yadro.com>
Subject: Re: [RFC PATCH v2 1/4] dt-bindings: misc: Add bindings for misc. BMC
 control fields
References: <20180711053122.30773-1-andrew@aj.id.au>
 <20180711053122.30773-2-andrew@aj.id.au>
 <20180711200450.GB17291@rob-hp-laptop>
 <1531356830.3551458.1437853280.551CA8C5@webmail.messagingengine.com>
 <CAL_JsqKpXxR4t_-3BOy-0mFePXkaSck_4PfHRD=OZQ-_-T5P=w@mail.gmail.com>
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In-Reply-To: <1532045276.1219110.1446722072.546C1F9D@webmail.messagingengine.com>

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20.07.2018 03:07, Andrew Jeffery wrote:
>> Andrew, can you start with a list that shows what you expect us to nee=
d
>> on our systems ?
>>
> Okay, our Witherspoon and Romulus platforms containing the ASPEED AST25=
00 currently need the following tuneables exposed:
>
> From the SCU:
> - Debug UART enable
> - VGA DAC mux
> - VGA scratch registers 0-7
> - LPC SuperIO decode enable
> - VGA MMIO decode enable
>
> From the LPC controller:
> - iLPC2AHB enable
> - SuperIO scratch registers 0x20-0x2f
>
> (The LPC controller is just as much of a collection of random bits as t=
he SCU)
>
> Lastly, our Palmetto platform uses an AST2400 which has fewer features =
compared to the AST2500. Its tuneable list is the same as the above with =
the exception of "Debug UART enable".
>
> Tuneables that we may need to expose in the future include:
>
> From the SCU:
> - PCI VID/DID for the BMC PCIe device
> - VGA device enable (may need to be disabled if the platform contains a=
 discrete graphics processor)
>
> From the LPC controller:
> - UART mux
>
> Alexander, Eugene, can you chime in with your platforms' needs?
In addition to what you've mentioned, we also need (and I believe you nee=
d it too) the SCU3C register (reset control/status) to determine the BMC =
reset reason and only perform certain actions on cold boots (see https://=
github.com/openbmc/openbmc/issues/3031). Although, this could probably be=
 handled by a separate driver, don't know which though.

Alexander.


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