From: "Lothar Waßmann" <LW@KARO-electronics.de>
To: Dong Aisheng <dongas86@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>,
Dong Aisheng <aisheng.dong@freescale.com>,
"vinod.koul\@linux.intel.com" <vinod.koul@linux.intel.com>,
"s.hauer\@pengutronix.de" <s.hauer@pengutronix.de>,
"linux-mmc\@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"rob.herring\@calxeda.com" <rob.herring@calxeda.com>,
Guo Shawn-R65073 <r65073@freescale.com>,
"rdunlap\@xenotime.net" <rdunlap@xenotime.net>,
"kernel\@pengutronix.de" <kernel@pengutronix.de>,
"cjb\@laptop.org" <cjb@laptop.org>,
Dong Aisheng-B29396 <B29396@freescale.com>,
"devicetree-discuss\@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
"linux-arm-kernel\@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v1 1/5] ARM: imx28: add basic dt support
Date: Tue, 20 Mar 2012 14:17:48 +0100 [thread overview]
Message-ID: <20328.33660.472382.117901@ipc1.ka-ro> (raw)
In-Reply-To: <CAA+hA=R8hLZMyRASRim28MNzX4jyE3nsaJ3DPzgxDtUmqtH62w@mail.gmail.com>
Hi,
Dong Aisheng writes:
> On Mon, Mar 19, 2012 at 3:02 PM, Grant Likely <grant.likely@secretlab.ca> wrote:
> > On Mon, 19 Mar 2012 17:49:02 +0100, Lothar Waßmann <LW@KARO-electronics.de> wrote:
> >> Hi,
> >>
> >> Grant Likely writes:
> >> > On Mon, 19 Mar 2012 07:54:33 +0100, Lothar Waßmann <LW@KARO-electronics.de> wrote:
> >> > > Grant Likely writes:
> >> > > > On Fri, 16 Mar 2012 11:01:35 +0800, Dong Aisheng <aisheng.dong@freescale.com> wrote:
> >> > > > > On Thu, Mar 15, 2012 at 07:22:04PM +0800, Lothar Waßmann wrote:
> >> > > > > > Dong Aisheng writes:
> >> > > > > > > On Thu, Mar 15, 2012 at 02:53:29PM +0800, Lothar Waßmann wrote:
> >> > > > > > Anyway there is no definite spec how the MAC address(es) are stored
> >> > > > > > in the fuse map. Thus reading the MAC from there is more or less
> >> > > > > > platform specific.
> >> > > > > >
> >> > > > > It's just provide one more option since there are customers storing the MAC
> >> > > > > in the fuse map.
> >> > > >
> >> > > > That should be straight forward to support; have a property that
> >> > > > specifies the method used for fetching/calculating the MAC.
> >> > > >
> >> > > Executable code stored inside a DT blob? ;)
> >> >
> >> > I know you're joking here, but I'm going to answer seriously
> >> > anyway... Absolutely not. What I'm suggesting is a property that
> >> > specifies the method used to determine the mac address. Something
> >> > like (off the top of my head):
> >> >
> >> > local-mac-address = [01 02 03 00 00 00];
> >> > local-mac-mask = [0xff 0xff 0xff 0 0 0];
> >> > mac-encoding = "append-serial-number";
> >> >
> >> That still does not specify where the remaining part of the MAC is
> >> stored and how it should be retrieved.
> >
> > I'm suggesting that you define a string that means something specific;
> > that hopefully can be shared by multiple platforms. For example,
> > "append-serial-number" might mean start with the values selected by
> > AND of local-mac-address and local-mac-mask, and OR in the board's
> > serial number. You would need to define something that worked if this
> > was the solution you used.
> >
> I'm intend to Grant's this suggestion.
> This can be shared by all other imx platforms which stores mac address in
> fuse map and this is commonly used by customer.
> Then we do not need keep writing repeat code for different platforms
> via platform
> data.
>
> For Lothar's question, we can add a property fuse_mac_offset to indicate
> read mac from fuse map and where to read it.
>
That's not really enough. The format (big-endian vs. little-endian)
may also differ. But it's not really necessary, if the solution with
prom_update_property() works, since then platform code has full
control over the MAC.
> For how many bytes to read, we can calculate it from the local-mac-mask.
> For example, local-mac-mask = [0xff 0xff 0xff 0 0 0], we can get the size
> as 3 bypes.
>
> Then we have three properties:
> local-mac-address = [01 02 03 00 00 00];
> local-mac-mask = [0xff 0xff 0xff 0 0 0];
> fuse_mac_offset = <1>;
>
> In fec driver, the final mac address can be got by:
> local-mac-address & local-mac-mask | (read_fuse(1) & 0xffffff)
>
> Lathar,
> Do you think if this is ok?
>
No. IMO the FEC driver itself should not read any fuses.
Reading fuses is a SoC specific thing and the FEC driver should not
depend on the idiosyncrasies of some SoC wrt. anything else but the
implementation of the FEC itself.
Lothar Waßmann
--
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next prev parent reply other threads:[~2012-03-20 13:18 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 8:47 [PATCH v1 0/5] dt: add basic imx28 support Dong Aisheng
2012-03-13 8:47 ` [PATCH v1 1/5] ARM: imx28: add basic dt support Dong Aisheng
2012-03-13 14:35 ` Rob Herring
2012-03-13 14:59 ` Zach Sadecki
2012-03-13 17:28 ` Grant Likely
2012-03-14 5:38 ` Shawn Guo
2012-03-14 6:23 ` Dong Aisheng
2012-03-14 6:51 ` Marek Vasut
2012-03-14 13:05 ` Rob Herring
2012-03-15 2:57 ` Dong Aisheng
2012-03-13 17:23 ` Grant Likely
2012-03-14 5:41 ` Shawn Guo
2012-03-14 5:56 ` Marek Vasut
2012-03-14 6:30 ` Dong Aisheng
2012-03-14 12:45 ` Dong Aisheng
2012-03-14 14:16 ` s.hauer
2012-03-15 3:02 ` Dong Aisheng
2012-03-15 6:53 ` Lothar Waßmann
2012-03-15 10:59 ` Dong Aisheng
2012-03-15 11:22 ` Lothar Waßmann
2012-03-16 3:01 ` Dong Aisheng
2012-03-16 7:48 ` Lothar Waßmann
2012-03-16 8:22 ` Dong Aisheng
[not found] ` <20120318184749.BB15D3E07BF@localhost>
2012-03-19 6:54 ` Lothar Waßmann
[not found] ` <20120319150601.B783A3E05A5@localhost>
2012-03-19 16:49 ` Lothar Waßmann
[not found] ` <20120319220224.ABF5A3E0A04@localhost>
2012-03-20 12:49 ` Dong Aisheng
2012-03-20 13:17 ` Lothar Waßmann [this message]
2012-03-21 11:06 ` Dong Aisheng
2012-03-16 8:49 ` Shawn Guo
2012-03-15 11:24 ` s.hauer
2012-03-16 3:05 ` Dong Aisheng
2012-03-14 19:41 ` Sascha Hauer
2012-03-15 3:05 ` Dong Aisheng
2012-03-13 8:47 ` [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support Dong Aisheng
2012-03-13 17:42 ` Grant Likely
2012-03-14 6:42 ` Dong Aisheng
2012-03-14 5:58 ` Marek Vasut
2012-03-14 6:55 ` Dong Aisheng
2012-03-14 7:09 ` Marek Vasut
2012-03-14 7:13 ` s.hauer
2012-03-14 7:26 ` Dong Aisheng
2012-03-14 11:17 ` Marek Vasut
2012-03-14 7:23 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-14 8:09 ` Dong Aisheng
2012-03-14 8:52 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-13 8:47 ` [PATCH v1 3/5] ARM: imx28evk: add mmc dt support Dong Aisheng
2012-03-13 14:39 ` Rob Herring
2012-03-13 16:52 ` Sascha Hauer
2012-03-13 17:45 ` Rob Herring
2012-03-14 7:30 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-14 8:20 ` Dong Aisheng
2012-03-14 8:54 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-14 7:28 ` Jean-Christophe PLAGNIOL-VILLARD
2012-03-13 8:47 ` [PATCH v1 4/5] dma: mxs-dma: add dt probe support Dong Aisheng
2012-03-14 7:54 ` Huang Shijie
2012-03-14 8:23 ` Dong Aisheng
2012-03-13 8:47 ` [PATCH v1 5/5] ARM: mxs: add mxs dma dt support Dong Aisheng
2012-03-14 7:58 ` Huang Shijie
2012-03-14 8:30 ` Dong Aisheng
2012-03-14 8:43 ` Huang Shijie
2012-03-14 6:01 ` [PATCH v1 0/5] dt: add basic imx28 support Marek Vasut
2012-03-14 7:34 ` Dong Aisheng
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