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Date: Wed, 1 Feb 2012 17:19:55 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: Heiko Schocher <hs@...x.de>
Cc: davinci-linux-open-source@...ux.davincidsp.com,
linux-arm-kernel@...ts.infradead.org,
devicetree-discuss@...ts.ozlabs.org, netdev@...r.kernel.org,
Sekhar Nori <nsekhar@...com>, Wolfgang Denk <wd@...x.de>
Subject: Re: [RFC PATCH 4/7] ARM: davinci: net: davinci_emac: add OF support
On Tue, Jan 31, 2012 at 12:27:11PM +0100, Heiko Schocher wrote:
> Hello Grant,
>
> Grant Likely wrote:
> > On Mon, Jan 23, 2012 at 09:56:04AM +0100, Heiko Schocher wrote:
> >> add of support for the davinci_emac driver.
> >>
> >> Signed-off-by: Heiko Schocher <hs@...x.de>
> >> Cc: davinci-linux-open-source@...ux.davincidsp.com
> >> Cc: linux-arm-kernel@...ts.infradead.org
> >> Cc: devicetree-discuss@...ts.ozlabs.org
> >> Cc: netdev@...r.kernel.org
> >> Cc: Grant Likely <grant.likely@...retlab.ca>
> >> Cc: Sekhar Nori <nsekhar@...com>
> >> Cc: Wolfgang Denk <wd@...x.de>
> >> ---
> >> .../bindings/arm/davinci/davinci_emac.txt | 46 ++++++++
> >> drivers/net/ethernet/ti/davinci_emac.c | 111 +++++++++++++++++++-
> >> 2 files changed, 156 insertions(+), 1 deletions(-)
> >> create mode 100644 Documentation/devicetree/bindings/arm/davinci/davinci_emac.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/arm/davinci/davinci_emac.txt b/Documentation/devicetree/bindings/arm/davinci/davinci_emac.txt
> >> new file mode 100644
> >> index 0000000..4e5dc8d
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/arm/davinci/davinci_emac.txt
> >> @@ -0,0 +1,46 @@
> >> +* Texas Instruments Davinci EMAC
> >> +
> >> +This file provides information, what the davice node
> >> +for the davinci_emac interface contain.
> >> +
> >> +Required properties:
> >> +- compatible: "ti,davinci-emac";
> >> +- reg: Offset and length of the register set for the device
> >> +- ctrl_reg_offset: offset to control register
> >> +- ctrl_mod_reg_offset: offset to control module register
> >> +- ctrl_ram_offset: offset to control module ram
> >
> > Should these be explicit properties, or can they be discerned from the
> > compatible string (which should include the hardware version; see
> > below).
>
> Hmm.. I do not know all davinci SoCs ... maybe someone from TI
> could answer this? But I think, we could discern this from
> the compatible string. I prepare this for v2. Maybe it is Ok,
> if I do this only for my hardwareversion and others add this,
> if needed? (maybe the better approach, as I can code it, but
> have no hw for testing it ... so it maybe is buggy)
>
> > Also, any custom properties that are specific to a binding really
> > should include a vendor prefix ('ti,') to avoid namespace collisions
> > with common bindings.
>
> Yep, is "ti,davinci-" ok? Also I should use dashes instead
> underscores, right?
Correct.
>
> >> +- hw_ram_addr: hardware ram addr
> >
> > Can this be added as a second tuple in the reg property?
>
> No, if I know this right, this is used for DMA, and also could be RAM.
Not getting what you mean here. The second tuple could be omitted if there
isn't a physical address for hardware ram.
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