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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>
Subject: Re: [RFC PATCH v2 1/4] dt-bindings: misc: Add bindings for misc. BMC control fields
Date: Thu, 23 Aug 2018 18:32:13 +0300
Message-ID: <81f3d73a-acce-6dad-2e65-49f499c60eb9@yadro.com> (raw)
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 need
>> on our systems ?
>>
> Okay, our Witherspoon and Romulus platforms containing the ASPEED AST2500 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 the 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 need 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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  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-11  5:31 [RFC PATCH v2 0/4] sysfs interface to miscellaneous BMC controls and fields Andrew Jeffery
2018-07-11  5:31 ` [RFC PATCH v2 1/4] dt-bindings: misc: Add bindings for misc. BMC control fields Andrew Jeffery
2018-07-11 20:04   ` Rob Herring
2018-07-12  0:14     ` Benjamin Herrenschmidt
2018-07-12  0:53     ` Andrew Jeffery
2018-07-12 15:11       ` Rob Herring
2018-07-13  0:55         ` Benjamin Herrenschmidt
2018-07-13  6:31           ` Andrew Jeffery
2018-07-13 15:14             ` Alexander Amelkin
2018-07-13 18:49               ` Eugene.Cho
2018-07-13 19:03                 ` Greg KH
2018-07-13 19:06                   ` Eugene.Cho
2018-07-15 14:21                     ` Avi Fishman
2018-07-16  0:57               ` Andrew Jeffery
2018-07-16 13:55             ` Rob Herring
2018-07-17  1:04               ` Andrew Jeffery
2018-07-17  4:56               ` Benjamin Herrenschmidt
2018-07-17 23:28                 ` Andrew Jeffery
2018-07-18 19:07                   ` Rob Herring
2018-07-19  1:57                     ` Andrew Jeffery
2018-07-18 19:50                 ` Rob Herring
2018-07-18 23:58                   ` Benjamin Herrenschmidt
2018-07-19  2:28                     ` Andrew Jeffery
2018-07-19  4:35                       ` Benjamin Herrenschmidt
2018-07-20  0:07                         ` Andrew Jeffery
2018-07-20  4:56                           ` Benjamin Herrenschmidt
2018-08-10  0:22                             ` Kun Yi
2018-08-23 15:32                           ` Alexander Amelkin [this message]
2018-07-11  5:31 ` [RFC PATCH v2 2/4] Documentation: ABI: Add sysfs-devices-platform-field to testing Andrew Jeffery
2018-07-11  5:31 ` [RFC PATCH v2 3/4] misc: Add bmc-misc-ctrl Andrew Jeffery
2018-07-11  5:31 ` [RFC PATCH v2 4/4] dts: aspeed-g5: Describe VGA, SIO scratch and DAC mux fields Andrew Jeffery

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