linux-kernel - Re: [PATCH 3/5] spi: pxa2xx: use an enum for type

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Date:   Tue, 09 Oct 2018 18:43:41 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Daniel Mack <daniel@...que.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 3/5] spi: pxa2xx: use an enum for type

On Fri, 2018-09-21 at 22:34 +0200, Robert Jarzmik wrote:
> Lubomir Rintel <lkundrak@...sk> writes:
> 
> > That seems to be the correct type.
> Okay, but what happens here when adev_id->driver_data is a value out
> of enum
> range ? Does the following assignment make sense ?
> > +		type = (enum pxa_ssp_type)adev_id->driver_data;

No change in behavior. In standard C the enum type is compatible with
an integer type (char or larger), thus type would just hold a value
outside the rank of an enum.

But why would that happen? What we can get here is just the constants
from pxa2xx_spi_acpi_match[], all of them of enum pxa_ssp_type type.

> As a side note, could you join for the next throw to the review :
>  - Jarkko Nikula <jarkko.nikula@...ux.intel.com>
>  - Mika Westerberg <mika.westerberg@...ux.intel.com>
> 
> Even if they are Intel, I think they have worked a lot on this driver
> for Intel
> platforms.

Will do.

> Cheers.

Thanks,
Lubo