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 18:41:15 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.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

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.

[1] - https://lkml.org/lkml/2013/4/1/278

-- 
Pali Rohár
pali.rohar@...il.com

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