netdev - Re: [PATCH RESEND] can: mcp251x: Replace power callbacks with regulator API

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Message-ID: <520FD60E.4040709@pengutronix.de>
Date:	Sat, 17 Aug 2013 21:59:10 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Alexander Shiyan <shc_work@...l.ru>
CC:	Haojian Zhuang <haojian.zhuang@...il.com>,
	Eric Miao <eric.y.miao@...il.com>, netdev@...r.kernel.org,
	linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RESEND] can: mcp251x: Replace power callbacks with regulator
 API

On 08/17/2013 06:30 AM, Alexander Shiyan wrote:
[...]
>> Since DT conversion isn't finished, I still accept the board files.
>> But this patch should be split into two parts. One is for pxa, and the
>> other one is for net.
> 
> Patch cannot be splitted because this can create hole which break git-bisect.
> 
> In any case, I want to create a v2 with a more detailed description, and I
> have a supplementary question for the CAN subsystem maintainers.
> "Transciever power" is not used by any of the boards, can we remove it
> completely? This will greatly simplify driver.

Do you mean the former transceiver_enable() callback?

>  struct mcp251x_platform_data {
>  	unsigned long oscillator_frequency;
>  	unsigned long irq_flags;
> -	int (*board_specific_setup)(struct spi_device *spi);
> -	int (*transceiver_enable)(int enable);
> -	int (*power_enable) (int enable);
>  };

Having a switchable transceiver is a quite common thing. So I'd like
that you keep it. The flexcan driver was just converted from a callback
to a regulator too. It already has device tree bindings and I'd like to
use these bindings as a standard for new drivers. From flexcan's dt
bindings:

> - xceiver-supply: Regulator that powers the CAN transceiver

which translates into:

> priv->reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");

Can you please use "xceiver" instead of "transceiver", so that future DT
binding will fit the scheme.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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