linux-kernel - Re: Sense of soc bus? (was: [PATCH] base: soc: Export soc_device_to

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Message-ID: <faa9924a-1c61-349c-9c35-da83fd0b3547@suse.de>
Date:   Fri, 15 Nov 2019 12:15:50 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-realtek-soc@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Kevin Hilman <khilman@...libre.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        NXP Linux Team <linux-imx@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Lee Jones <lee.jones@...aro.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        LAKML <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Architecture Mailman List <boot-architecture@...ts.linaro.org>,
        U-Boot <u-boot@...ts.denx.de>
Subject: Re: Sense of soc bus? (was: [PATCH] base: soc: Export
 soc_device_to_device() helper)

Am 14.11.19 um 23:09 schrieb Rob Herring:
> On Tue, Nov 12, 2019 at 4:47 AM Andreas Färber <afaerber@...e.de> wrote:
>> On the other hand, one might argue that such information should just be
>> parsed by EBBR-conformant bootloaders and be passed to the kernel via
>> standard UEFI interfaces and DMI tables. But I'm not aware of Barebox
>> having implemented any of that yet, and even for U-Boot (e.g., Realtek
>> based consumer devices...) not everyone has the GPL sources or tools to
>> update their bootloader. So, having the kernel we control gather
>> information relevant to kernel developers does make some sense to me.
> 
> UEFI and DMI are orthogonal, right. You can't expect DMI on a UEFI+DT system.

Not sure, that's why I CC'ed the EBBR folks for input. If it's not
mandatory today, the next revision of EBBR could just require it - if
that's the unified way between SBBR and EBBR. Little point in doing it
only for EBBR.

On my UEFI+DT based Raspberry Pi 3 Model B I do see it, note the
non-filled Processor Information delivered by U-Boot:

raspi3:~ # dmidecode
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.0 present.
7 structures occupying 253 bytes.
Table at 0x3CB3E020.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
	Vendor: U-Boot
	Version: 2019.10
	Release Date: 10/26/2019
	ROM Size: 64 kB
	Characteristics:
		PCI is supported
		BIOS is upgradeable
		Selectable boot is supported
		I2O boot is supported
		Targeted content distribution is supported

Handle 0x0001, DMI type 1, 27 bytes
System Information
	Manufacturer: raspberrypi
	Product Name: rpi
	Version: Not Specified
	Serial Number: 00000000********
	UUID: 30303030-3030-3030-6437-623461336666
	Wake-up Type: Reserved
	SKU Number: Not Specified
	Family: Not Specified

Handle 0x0002, DMI type 2, 14 bytes
Base Board Information
	Manufacturer: raspberrypi
	Product Name: rpi
	Version: Not Specified
	Serial Number: Not Specified
	Asset Tag: Not Specified
	Features:
		Board is a hosting board
	Location In Chassis: Not Specified
	Chassis Handle: 0x0000
	Type: Motherboard

Handle 0x0003, DMI type 3, 21 bytes
Chassis Information
	Manufacturer: raspberrypi
	Type: Desktop
	Lock: Not Present
	Version: Not Specified
	Serial Number: Not Specified
	Asset Tag: Not Specified
	Boot-up State: Safe
	Power Supply State: Safe
	Thermal State: Safe
	Security Status: None
	OEM Information: 0x00000000
	Height: Unspecified
	Number Of Power Cords: Unspecified
	Contained Elements: 0

Handle 0x0004, DMI type 4, 48 bytes
Processor Information
	Socket Designation: Not Specified
	Type: Central Processor
	Family: Unknown
	Manufacturer: Unknown
	ID: 00 00 00 00 00 00 00 00
	Version: Unknown
	Voltage: Unknown
	External Clock: Unknown
	Max Speed: Unknown
	Current Speed: Unknown
	Status: Unpopulated
	Upgrade: None
	L1 Cache Handle: Not Provided
	L2 Cache Handle: Not Provided
	L3 Cache Handle: Not Provided
	Serial Number: Not Specified
	Asset Tag: Not Specified
	Part Number: Not Specified
	Characteristics: None

Handle 0x0005, DMI type 32, 11 bytes
System Boot Information
	Status: No errors detected

Handle 0x0006, DMI type 127, 4 bytes
End Of Table


Regards,
Andreas

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