linux-kernel - Re: [PATCH V3 00/11] Multiplatform BMIPS kernel

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Date:	Mon, 24 Nov 2014 14:34:24 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	ralf@...ux-mips.org, f.fainelli@...il.com, jfraser@...adcom.com,
	dtor@...omium.org, tglx@...utronix.de, jason@...edaemon.net,
	jogo@...nwrt.org, computersforpeace@...il.com,
	linux-mips@...ux-mips.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 00/11] Multiplatform BMIPS kernel

On Sunday 23 November 2014 18:40:35 Kevin Cernekee wrote:

> V2->V3:
> 
>  - Omit the BMIPS updates that have already been accepted into Ralf's tree.
>    They are still needed, but not reposted.
> 
>  - Make USB endian swap options conditional on "if CPU_BIG_ENDIAN".
> 
>  - Remove board listing from Documentation/devicetree/bindings/mips/brcm/soc.txt
> 
>  - Remove legacy device autodetection and chip ID decoding.  Legacy
>    boards/bootloaders will be supported by selecting a single DTB file
>    to compile into the kernel.
> 
>  - Refactor quirks code to match against DT "compatible" strings, not chip IDs.
> 
>  - Fix CPU1 boot (missing DT node) on 6329.
> 
>  - Remove @0 / addressing properties on non-reg nodes.
> 
>  - Remove bogus "brcm,bmips" bus registration.
> 
>  - Move UBUS peripherals onto a "simple-bus" and set DMA ranges for this
>    bus on bcm3384_zephyr.
> 
>  - Fix base addresses on 6328/6368 for "periph_intc@...00020".
> 
>  - Change the MIPS_L1_CACHE_SHIFT calculation so as to minimize the impact
>    on other builds (like bcm63xx).

Looks nice to me overall, with the new way of handling the dtb passing,
this seems much more flexible, and I guess it can be turned into an
actual multiplatform build if there is ever a desire to do that.

> Re: dma-ranges
> 
> dma.c implements a minimal remapping scheme just for the current UBUS
> peripherals.  The remapping is global, and it isn't the same mapping
> needed for PCI(e).  A more comprehensive solution will be needed before
> PCI support can be added.
> 
> On chips OTHER than 3384, remapping is only required on PCI (not UBUS or
> "rdb").  Notably, BCM7445, an ARM platform currently supported upstream,
> doesn't require dma-ranges for non-PCI devices.
> 
> I am hoping we can piggyback on top of the ARM dma-ranges code once it
> is merged.  This will allow for eliminating my dma.c.

Sounds good.

	Arnd

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