[PATCH] versal: watchdog: Add support for Xilinx window watchdog

[Tom Rini <trini@konsulko.com>]

On Wed, Mar 11, 2020 at 01:11:07PM +0100, Michal Simek wrote:
> On 11. 03. 20 12:56, Stefan Roese wrote:
> > Hi Michal,
> > 
> > On 11.03.20 12:34, Michal Simek wrote:
> > 
> > <snip>
> > 
> >>>> +/* Generic Control/Status Register Masks */
> >>>> +#define XWT_WWCSR_GWEN_MASK??? BIT(0) /* Enable Bit */
> >>>> +
> >>>> +struct wwdt_regs {
> >>>> +??? u32 reserved0[1024];
> >>>> +??? u32 refresh;??????? /* Refresh Register [0x1000] */
> >>>> +??? u32 reserved1[1023];
> >>>> +??? u32 csr;??????? /* Control/Status Register [0x2000] */
> >>>> +??? u32 reserved2;
> >>>> +??? u32 offset;??????? /* Offset Register [0x2008] */
> >>>> +??? u32 reserved3;
> >>>> +??? u32 cmp0;??????? /* Compare Value Register0 [0x2010] */
> >>>> +??? u32 cmp1;??????? /* Compare Value Register1 [0x2014] */
> >>>> +??? u32 reserved4[1006];
> >>>> +??? u32 warmrst;??????? /* Warm Reset Register [0x2FD0] */
> >>>> +};
> >>>
> >>> My understanding is, that we moved to using defines instead of structs
> >>> for register definitions. So if you need to send a v2, then please
> >>> consider using #defines here.
> >>
> >> When was that decision done? Any link to documentation/commit message?
> > 
> > Frankly, I don't remember and unfortunately I don't have a link ready
> > to share. I've seen discussions in the past, where the old U-Boot style
> > using structs was not preferred any more. So newer code moves to using
> > the more common #defines instead. Perhaps some else can share a link?
> 
> Tom: Do you have any comment/link?

Well, in general, we have regmap and that should be used.  In cases like
this where we have some huge reserved chunks it shows the worst-case of
using a struct for this too.

-- 
Tom
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