linux-kernel - Re: [PATCH 3/5] mfd: tc3589x: reform device tree probing

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Date:	Wed, 16 Oct 2013 10:43:56 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mfd: tc3589x: reform device tree probing

On Tue, 15 Oct 2013, Linus Walleij wrote:

> This changes the following mechanisms in the TC3589x device tree
> probing path:
> 
> - Use the .of_match_table in struct device_driver to match the
>   device in the device tree.
> - Add matches for the proper compatible strings "toshiba,..."
>   and all sub-variants, just as is done for the .id matches.
> - Move over all the allocation of platform data etc to the
>   tc3589x_of_probe() function and follow the pattern of passing
>   a platform data pointer back, or an error pointer on error,
>   as found in the STMPE driver.
> - Match the new (proper) compatible strings for the GPIO and
>   keypad MFD cells.
> - Use of_device_is_compatible() rather than just !strcmp()
>   to discover which cells to instantiate.
> 
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  drivers/mfd/tc3589x.c | 84 ++++++++++++++++++++++++++++++++++++---------------
>  1 file changed, 59 insertions(+), 25 deletions(-)

Nice patch overall.

> +	of_id = of_match_device(tc3589x_match, dev);
> +	if (!of_id)
> +		return ERR_PTR(-ENODEV);

I still think -EINVAL is better in this case, but I see that some
people are using -ENODEV as well and I'm not religious enough about it
to care, so:

Acked-by: Lee Jones <lee.jones@...aro.org>

:)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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