Messages in this thread | | | Date | Fri, 30 Jan 2015 10:28:07 -0500 (EST) | From | Vivien Didelot <> | Subject | Re: [PATCH 2/4] watchdog: max63xx: cleanup |
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Hi Guenter,
> > -#define MAX6369_WDSET (7 << 0) > > -#define MAX6369_WDI (1 << 3) > > Not really sure I understand why you remove those constants. > that is personal preference, not cleanup. Someone else might > submit another cleanup later on and re-introduce them.
Indeed, I should have explained this. My primary intention with this patchset is to bring GPIO support to this driver. MAX6369_WDSET, which is a mask, is specific to the memory mapped support. I first intented to rename it to MAX6369_MMAP_WDSET to explicitly mention the connection, but I ended up thinking that a clear comment in the related functions would be much clearer that a generic named macro.
These masks are explained below in this patch:
In max63xx_mmap_ping(): + /* WDI is the 4th bit of the memory mapped byte */ + __raw_writeb(val | BIT(3), data->base); + __raw_writeb(val & ~BIT(3), data->base);
and max63xx_mmap_set(): + /* SET0, SET1, SET2 are the 3 lower bits of the memory mapped byte */ + val = __raw_readb(data->base); + val &= ~7; + val |= set & 7; + __raw_writeb(val, data->base);
Also, if it is possible for a platform to map these bits in a different way, some platform settings would have to be added and thus these macros won't be relevant.
Thanks, -v
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