From: Mark Rutland <mark.rutland@arm.com>
To: Chris Bostic <christopher.lee.bostic@gmail.com>
Cc: robh+dt@kernel.org, linux@armlinux.org.uk,
gregkh@linuxfoundation.org, sre@kernel.org,
mturquette@baylibre.com, geert+renesas@glider.be,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Jeremy Kerr <jk@ozlabs.org>,
joel@jms.id.au, linux-kernel@vger.kernel.org, andrew@aj.id.au,
alistair@popple.id.au, benh@kernel.crashing.org,
Chris Bostic <cbostic@us.ibm.com>
Subject: Re: [PATCH 05/16] drivers/fsi: Add fake master driver
Date: Wed, 7 Dec 2016 12:09:05 +0000 [thread overview]
Message-ID: <20161207120905.GD7054@leverpostej> (raw)
In-Reply-To: <1481069677-53660-6-git-send-email-christopher.lee.bostic@gmail.com>
On Tue, Dec 06, 2016 at 06:14:26PM -0600, Chris Bostic wrote:
> From: Jeremy Kerr <jk@ozlabs.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.
> +
> +static struct platform_driver fsi_master_fake_driver = {
> + .driver = {
> + .name = "fsi-master-fake",
> + .of_match_table = fsi_master_fake_match,
> + },
> + .probe = fsi_master_fake_probe,
> +};
> +
> +static int __init fsi_master_fake_init(void)
> +{
> + struct device_node *np;
> +
> + platform_driver_register(&fsi_master_fake_driver);
> +
> + for_each_compatible_node(np, NULL, "ibm,fsi-master-fake")
> + of_platform_device_create(np, NULL, NULL);
As a general note, please use for_each_matching_node in situations like
this. That way you can reuse your existing of_device_id table, and not
reproduce the string.
That said, this is not necessary. The platform driver has an
of_match_table, so presumes the parent bus registers children, and hence
they should already have platform devices.
Thanks,
Mark.
next prev parent reply other threads:[~2016-12-07 12:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 0:14 [PATCH 00/16] FSI device driver introduction Chris Bostic
2016-12-07 0:14 ` [PATCH 01/16] drivers/fsi: Add empty fsi bus definitions Chris Bostic
2016-12-07 0:14 ` [PATCH 02/16] drivers/fsi: Add device & driver definitions Chris Bostic
2016-12-07 0:14 ` [PATCH 03/16] drivers/fsi: add driver to device matches Chris Bostic
2016-12-07 0:14 ` [PATCH 05/16] drivers/fsi: Add fake master driver Chris Bostic
2016-12-07 12:09 ` Mark Rutland [this message]
2016-12-07 23:27 ` Jeremy Kerr
2016-12-07 0:14 ` [PATCH 06/16] drivers/fsi: Add slave definition Chris Bostic
2016-12-07 0:14 ` [PATCH 07/16] drivers/fsi: Add empty master scan Chris Bostic
2016-12-07 0:14 ` [PATCH 10/16] drivers/fsi: scan slaves & register devices Chris Bostic
2016-12-07 0:14 ` [PATCH 13/16] drivers/fsi: Set slave SMODE to init communication Chris Bostic
2016-12-07 0:14 ` [PATCH 14/16] drivers/fsi: Add master unscan Chris Bostic
2016-12-07 9:31 ` Greg KH
2016-12-07 0:14 ` [PATCH 15/16] drivers/fsi: Add documentation for GPIO bindings Chris Bostic
2016-12-07 12:02 ` Mark Rutland
2016-12-07 0:14 ` [PATCH 16/16] drivers/fsi: Add GPIO based FSI master Chris Bostic
2016-12-09 4:12 ` Jeremy Kerr
2016-12-12 19:49 ` Christopher Bostic
2016-12-07 1:52 ` [PATCH 00/16] FSI device driver introduction Sebastian Reichel
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