Re: [PATCH v4 4/5] platform/x86: intel_pmc_ipc: Fix iTCO GCS memory mapping failure

[Andy Shevchenko]

On Sat, Apr 1, 2017 at 2:27 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> wrote:
> iTCO watchdog driver need access to PMC_CFG GCR register to modify

iTCO_wdt or use above in the rest of the series.

So, choose one and use it everywhere in your patch series.

> the no reboot setting. Currently, this is done by passing PMC_CFG reg
> address as memory resource to watchdog driver and allowing it directly
> modify the PMC_CFG register. But currently PMC driver also has
> requirement to memory map the entire GCR register space in this driver.
> This causes mem request failure in watchdog driver. So this patch fixes
> this issue by adding api to update noreboot flag and passes them
> to watchdog driver via platform data.


> +static int update_noreboot_bit(bool status)
> +{
> +       if (status)

> +               return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG, BIT(4),
> +                                           BIT(4));

BIT(4) is a magic. Moreover, it's used as mask and value here, you
might introduce temporary variables for better understanding what is
what.
As an example you may look at drivers/acpi/acpi_lpss.c (code related
to IOSF MBI interaction).

> +       else

Redundant.


-- 
With Best Regards,
Andy Shevchenko