linux-kernel - Re: [PATCH 05/16] drivers/fsi: Add fake master driver

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Date:   Thu, 8 Dec 2016 10:27:46 +1100
From:   Jeremy Kerr <jk@...abs.org>
To:     Mark Rutland <mark.rutland@....com>,
        Chris Bostic <christopher.lee.bostic@...il.com>
Cc:     robh+dt@...nel.org, linux@...linux.org.uk,
        gregkh@...uxfoundation.org, sre@...nel.org,
        mturquette@...libre.com, geert+renesas@...der.be,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        joel@....id.au, linux-kernel@...r.kernel.org, andrew@...id.au,
        alistair@...ple.id.au, benh@...nel.crashing.org,
        Chris Bostic <cbostic@...ibm.com>
Subject: Re: [PATCH 05/16] drivers/fsi: Add fake master driver

Hi Mark & Chris,

> On Tue, Dec 06, 2016 at 06:14:26PM -0600, Chris Bostic wrote:
>> From: Jeremy Kerr <jk@...abs.org>
>>
>> For debugging, add a fake master driver, that only supports reads,
>> returning a fixed set of data.
> 
>> +config FSI_MASTER_FAKE
>> +	tristate "Fake FSI master"
>> +	depends on FSI
>> +	---help---
>> +	This option enables a fake FSI master driver for debugging.
>> +endif
> 
>> +static const struct of_device_id fsi_master_fake_match[] = {
>> +	{ .compatible = "ibm,fsi-master-fake" },
>> +	{ },
>> +};
> 
> NAK.
> 
> DT should be treated as an ABI, and should describe the HW explicitly.
> This makes no sense. This is also missing a binding document.
> 
> Have your module take a module parameter allowing you to bind it to
> arbitrary devices, or do something like what PCI does where you can
> bind/unbind arbitrary drivers to devices using sysfs.

This driver is purely for testing the FSI engine scan code; we could
probably just drop this patch since I suspect that it's no longer useful
(now that we have an actual master driver).

If we do want to keep it though, I'd say we remove the device tree
dependency; all this is doing at the moment is triggering the ->probe,
and there are better ways to do that.

Cheers,


Jeremy