linux-kernel - Re: [PATCH v2 1/3] omap2: Change clk dev id for rng to omap3-rom-rng

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Date:	Fri, 20 Sep 2013 10:46:41 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Russell King <linux@....linux.org.uk>,
	Joe Perches <joe@...ches.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] omap2: Change clk dev id for rng to
 omap3-rom-rng

* Pali Rohár <pali.rohar@...il.com> [130920 09:49]:
> On Friday 20 September 2013 18:23:43 Tony Lindgren wrote:
> > * Pali Rohár <pali.rohar@...il.com> [130920 06:33]:
> > > Name omap_rng is already used by omap_rng driver which is
> > > for omap2 and omap4. For omap3 HS devices there is new
> > > driver omap3-rom-rng which needs that clk. And because
> > > there cannot be two drivers with same name, rename omap3
> > > clk dev id.
> > > 
> > > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > > ---
> > > 
> > >  arch/arm/mach-omap2/cclock3xxx_data.c |    2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/arch/arm/mach-omap2/cclock3xxx_data.c
> > > b/arch/arm/mach-omap2/cclock3xxx_data.c index
> > > 334b767..5059338 100644
> > > --- a/arch/arm/mach-omap2/cclock3xxx_data.c
> > > +++ b/arch/arm/mach-omap2/cclock3xxx_data.c
> > > @@ -3274,7 +3274,7 @@ static struct omap_clk omap36xx_clks[]
> > > = {
> > > 
> > >   */
> > >  
> > >  static struct omap_clk omap34xx_omap36xx_clks[] = {
> > >  
> > >  	CLK(NULL,	"aes1_ick",	&aes1_ick),
> > > 
> > > -	CLK("omap_rng",	"ick",		&rng_ick),
> > > +	CLK("omap3-rom-rng",	"ick",		&rng_ick),
> > > 
> > >  	CLK(NULL,	"sha11_ick",	&sha11_ick),
> > >  	CLK(NULL,	"des1_ick",	&des1_ick),
> > >  	CLK(NULL,	"cam_mclk",	&cam_mclk),
> > 
> > Hmm are you sure the omap_rng is not available on
> > any of the omap3 GP versions? If so, the omap_rng
> > alias should be kept as well.
> > 
> > Regards,
> > 
> > Tony
> 
> I really do not know, but driver char/hw_random/omap-rng.c 
> support only omap2 and omap4 platforms. So "omap_rng" dev id for 
> omap3 is not used.
> 
> In email [1] you suggested to use clk_get instead clk_get_sys. If 
> I understand correctly clk_get calling clk_get_sys with driver 
> name. So dev in in CLK macro must be same as driver name. And 
> because in cclock3xxx_data.c is dev id "omap_rng" and there is 
> already driver with name "omap_rng", I need to rename dev in 
> cclock3xxx_data.c to get new omap3-rom-rng driver working.
> 
> Or if you know better way how to do it, let me know.

I think it's safest to keep the existing alias also, and
add a comment saying that it may not be available on omap3
processors.

Regards,

Tony
 
> [1] - https://lkml.org/lkml/2013/4/1/278
> 
> -- 
> Pali Rohár
> pali.rohar@...il.com


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