From mboxrd@z Thu Jan  1 00:00:00 1970
From: aisheng.dong@freescale.com (Dong Aisheng)
Date: Fri, 29 Jun 2012 20:41:59 +0800
Subject: [PATCH 3/3] mtd: gpmi: change the code for clocks
In-Reply-To: <20120629124154.GG29197@S2101-09.ap.freescale.net>
References: <1340941925-14591-3-git-send-email-shijie8@gmail.com>
 <20120629020650.GB28932@S2101-09.ap.freescale.net>
 <20120629063329.GE5844@shlinux2.ap.freescale.net>
 <20461.30070.771087.830745@ipc1.ka-ro>
 <20120629093437.GK5844@shlinux2.ap.freescale.net>
 <20461.30991.63507.369439@ipc1.ka-ro>
 <20120629095433.GO5844@shlinux2.ap.freescale.net>
 <20120629111334.GB29197@S2101-09.ap.freescale.net>
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 <20120629124154.GG29197@S2101-09.ap.freescale.net>
Message-ID: <20120629124158.GA32473@shlinux2.ap.freescale.net>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, Jun 29, 2012 at 08:41:57PM +0800, Shawn Guo wrote:
> On Fri, Jun 29, 2012 at 08:14:38PM +0800, Dong Aisheng wrote:
> > > I'm with Lothar on this.  At least for imx28 case, we do not even need
> > > dummy clock, because NULL con_id in clkdev lookup will have all those
> > > clocks match the only one gpmi-nand clock on imx28, as I already said.
> > > 
> > I'm not quite understand. Can you clarify a bit more?
> > For extra clocks need by mx6q like "gpmi_bch", they're indeed have con_id.
> > Getting them will not fail on imx28 without dummy clock?
> > 
> You need to look at how imx28 registers clkdev for gpmi-nand.
> 
> static struct clk_lookup gpmi_lookups[] __initdata = {
>         { .dev_id = "imx28-gpmi-nand", },
>         { .dev_id = "8000c000.gpmi", },
> };
> 
> clk_register_clkdevs(clks[gpmi], gpmi_lookups, ARRAY_SIZE(gpmi_lookups));
> 
> As you can see, con_id is NULL for imx28 case.  As NULL is actually
> a wildcard for looking up, all the gpmi-nand clocks match it.
> 
I know this.
You may missed my point.
I mean extra clocks introduced for imx6q which is not exist on imx28.
For your proposal, the gpmi driver will acquire all clocks including
imx6q's.
So when get imx6q's gpmi clock like "gpmi-bch" like clk_get(dev, "gpmi-bch"),
it may fail for imx28.

Regards
Dong Aisheng