[PATCH v3 15/15] ARM: vexpress/dcscb: probe via device tree

[Nicolas Pitre]

On Tue, 29 Jan 2013, Rob Herring wrote:

> On 01/29/2013 01:51 AM, Nicolas Pitre wrote:
> > This allows for the DCSCB support to be compiled in and selected
> > at run time.
> 
> Shouldn't this just be rolled into the commit creating dcscb.c?

Probably, yes.

> > Signed-off-by: Nicolas Pitre <nico at linaro.org>
> > ---
> >  arch/arm/mach-vexpress/dcscb.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm/mach-vexpress/dcscb.c b/arch/arm/mach-vexpress/dcscb.c
> > index 58051ffafb..a724507cbc 100644
> > --- a/arch/arm/mach-vexpress/dcscb.c
> > +++ b/arch/arm/mach-vexpress/dcscb.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/io.h>
> >  #include <linux/spinlock.h>
> >  #include <linux/errno.h>
> > +#include <linux/of_address.h>
> >  #include <linux/vexpress.h>
> >  #include <linux/arm-cci.h>
> >  
> > @@ -24,8 +25,6 @@
> >  #include <asm/cp15.h>
> >  
> >  
> > -#define DCSCB_PHYS_BASE	0x60000000
> > -
> >  #define RST_HOLD0	0x0
> >  #define RST_HOLD1	0x4
> >  #define SYS_SWRESET	0x8
> > @@ -215,10 +214,14 @@ extern void dcscb_power_up_setup(unsigned int affinity_level);
> >  
> >  static int __init dcscb_init(void)
> >  {
> > +	struct device_node *node;
> >  	unsigned int cfg;
> >  	int ret;
> >  
> > -	dcscb_base = ioremap(DCSCB_PHYS_BASE, 0x1000);
> > +	node = of_find_compatible_node(NULL, NULL, "arm,dcscb");
> 
> This needs binding documentation and should be a more specific name. Not
> knowing what dcscb is, I don't have a suggestion.

Yes, I mentioned in the cover page that DT bindings are not yet 
documented.

DCSCB stands for "Dual Cluster System Control Block".  This is in fact a 
set of miscellaneous registers, mainly for reset control of individual 
CPUs and clusters.

> Perhaps should include vexpress or specific core tile name it is part 
> of.

/me hopes for some ARM dude more acquainted with their nomenclature to 
chime in with suggestions.


Nicolas