linux-kernel - Re: [PATCH 1/5] ARM: tegra: set up wlan clocks for tegra dt

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Date:	Thu, 05 Jul 2012 10:39:56 +0200
From:	Marc Dietrich <marvin24@....de>
To:	Wei Ni <wni@...dia.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	"olof@...om.net" <olof@...om.net>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"cjb@...top.org" <cjb@...top.org>
Subject: Re: [PATCH 1/5] ARM: tegra: set up wlan clocks for tegra dt

Am Donnerstag, 5. Juli 2012, 11:18:14 schrieb Wei Ni:
> On Wed, 2012-07-04 at 19:51 +0800, Marc Dietrich wrote:
> > Am Mittwoch, 4. Juli 2012, 19:23:33 schrieb Wei Ni:
> > > On Wed, 2012-07-04 at 18:43 +0800, Marc Dietrich wrote:
> > > > Am Mittwoch, 4. Juli 2012, 17:34:44 schrieb Wei Ni:
> > > > > Set up the wlan clock tree for Tegra20 and Tegra30.
> > > > > 
> > > > > Signed-off-by: Wei Ni <wni@...dia.com>
> > > > > ---
> > > > > 
> > > > >  arch/arm/mach-tegra/board-dt-tegra20.c |    1 +
> > > > >  arch/arm/mach-tegra/board-dt-tegra30.c |    1 +
> > > > >  2 files changed, 2 insertions(+), 0 deletions(-)
> > > > > 
> > > > > diff --git a/arch/arm/mach-tegra/board-dt-tegra20.c
> > > > > b/arch/arm/mach-tegra/board-dt-tegra20.c index 70a19a9..fbcc7d9
> > > > > 100644
> > > > > --- a/arch/arm/mach-tegra/board-dt-tegra20.c
> > > > > +++ b/arch/arm/mach-tegra/board-dt-tegra20.c
> > > > > @@ -78,6 +78,7 @@ static __initdata struct tegra_clk_init_table
> > > > > tegra_dt_clk_init_table[] = { { "pll_a",      "pll_p_out1",  
> > > > > 56448000,
> > > > > 
> > > > >   true },
> > > > >   
> > > > >  	{ "pll_a_out0", "pll_a",        11289600,       true },
> > > > >  	{ "cdev1",      NULL,           0,              true },
> > > > > 
> > > > > +	{ "blink",      "clk_32k",      32768,          true },
> > > > 
> > > > what's the reason to enable this on all boards? Would it make sense to
> > > > set
> > > > this to "false" instead?
> > > 
> > > This clock is used for the wlan device, it need to be enabled, so that
> > > the wlan device can be powered on, and then the mmc driver can enumerate
> > > it.
> > ...
> Yes we have thought about this issue.
> In here we need to enable this clock before loading wifi driver, so that
> the mmc driver can enumerate it.
> This likes another thing that the SD controller should be taught how to
> provide to clients, such as trigger the power/reset gpios. We had talked
> about it in the:
> http://www.spinics.net/lists/linux-wireless/msg92093.html

ah, sorry, I didn't followed this discussion.

> And we are trying to provide the tegra clk framework support, so at that
> time we could set this clock for different boards.
> 
> So I suppose we can just dump it into the clk init tables for now.

ok, thanks for explanation. Let's hope there will be a better solution in the 
future.

Thanks!

Marc


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