linux-kernel - Re: [PATCH V2 01/63] of: Add a new macro to declare_of for one parameter function returning a value

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Date:	Mon, 20 Jun 2016 16:03:30 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH V2 01/63] of: Add a new macro to declare_of for one
 parameter function returning a value

On Thu, Jun 16, 2016 at 4:26 PM, Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
> The macro OF_DECLARE_1 expect a void (*func)(struct device_node *) while the
> OF_DECLARE_2 expect a int (*func)(struct device_node *, struct device_node *).
>
> The second one allows to pass an init function returning a value, which make
> possible to call the functions in the table and check the return value in order
> to catch at a higher level the errors and handle them from there instead of
> doing a panic in each driver (well at least this is the case for the clkevt).
>
> Unfortunately the OF_DECLARE_1 does not allow that and that lead to some code
> duplication and crappyness in the drivers.
>
> The OF_DECLARE_1 is used by all the clk drivers and the clocksource/clockevent
> drivers. It is not possible to do the change in one shot as we have to change
> all the init functions.
>
> The OF_DECLARE_2 specifies an init function prototype with two parameters with
> the node and its parent. The latter won't be used, ever, in the timer drivers.
>
> Introduce a OF_DECLARE_1_RET macro to be used, and hopefully we can smoothly
> and iteratively change the users of OF_DECLARE_1 to use the new macro instead.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  include/linux/of.h | 3 +++
>  1 file changed, 3 insertions(+)

Acked-by: Rob Herring <robh@...nel.org>