linux-kernel - Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

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Message-ID: <Y1GLdp9GCqD7CdfW@smile.fi.intel.com>
Date:   Thu, 20 Oct 2022 20:55:02 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

On Thu, Oct 20, 2022 at 06:45:19PM +0100, Mark Brown wrote:
> On Thu, Oct 20, 2022 at 08:41:43PM +0300, Andy Shevchenko wrote:
> 
> > Okay, would it work for you if we check the named resource and only if it's
> > found take a property? In such case we can guarantee (AFAICS) that the 3rd
> > parties (like unknown firmware) won't mess up with the driver.
> 
> Not sure I quite get what you're proposing here but I *think* so,
> assuming you mean checking the values if the property is present (and
> error out if the property isn't there at all and you're instantiating
> via a MFD rather than direct PCI/DT binding I guess)?


When we instantiate via MFD, we (semi-)manually create resources for each of
the children. These resources may or may not have a dedicated names. Those
names can be given _only_ inside the source code in the kernel, so it means
it is _explicit_ telling, that we are know where the device in question comes
from.


In the code it will be like


	if (resource_with_name_present()) {
		ret = device_property_...
		if (ret)
			return ERROR "No mandatory property provided";
	}

Like you said, checking property only when we have resource present _by name_
and bail out if there is none.

-- 
With Best Regards,
Andy Shevchenko