[PATCH v4 08/18] watchdog: orion: Make RSTOUT register a separate resource

[thomas.petazzoni@free-electrons.com (Thomas Petazzoni)]

Dear Ezequiel Garcia,

On Wed, 22 Jan 2014 20:05:05 -0300, Ezequiel Garcia wrote:

> +/* RSTOUT mask register physical address for Orion5x, Kirkwood and Dove */
> +#define ORION_RSTOUT_MASK_OFFSET	0x20108
> +
> +/* Internal registers can be configured at any 1 MiB aligned address */
> +#define INTERNAL_REGS_MASK		~(SZ_1M - 1)

I'm not a big fan of hardcoding the internal register window size in a
driver. I would have preferred to have used the offset between the
watchdog registers and the rstout register, but since this one is
*before* the watchdog registers, it would have to be a negative offset.
Not sure how to handle this.

> +/*
> + * The original devicetree binding for this driver specified only
> + * one memory resource, so in order to keep DT backwards compatibility
> + * we try to fallback to a hardcoded register address, if the resource
> + * is missing from the devicetree.
> + */
> +static void __iomem *try_rstout_ioremap(struct platform_device *pdev,
> +					phys_addr_t internal_regs)

Why is it called "try" ? It actually does the mapping. So I would
prefer the function to be named:

	orion_wdt_ioremap_rstout()

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com