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From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
To: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Cc: linux-media@vger.kernel.org,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Prabhakar Lad <prabhakar.lad@ti.com>
Subject: Re: [PATCH v6 1/7] media: V4L2: add temporary clock helpers
Date: Mon, 08 Apr 2013 10:36:22 +0000	[thread overview]
Message-ID: <Pine.LNX.4.64.1304081234050.29945@axis700.grange> (raw)
In-Reply-To: <5147934D.2040908@gmail.com>

On Mon, 18 Mar 2013, Sylwester Nawrocki wrote:

[snip]

> > +unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk)
> > +{
> > +	if (!clk->ops->get_rate)
> > +		return -ENOSYS;
> 
> I guess we should just WARN if this callback is null and return 0
> or return value type of this function needs to be 'long'. Otherwise
> we'll get insanely large frequency value by casting this error code
> to unsigned long.

Comparing to the CCF: AFAICS, they do the same, you're supposed to use 
IS_ERR_VALUE() on the clock rate, obtained from clk_get_rate().

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/

WARNING: multiple messages have this Message-ID (diff)
From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
To: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Cc: linux-media@vger.kernel.org,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Prabhakar Lad <prabhakar.lad@ti.com>
Subject: Re: [PATCH v6 1/7] media: V4L2: add temporary clock helpers
Date: Mon, 8 Apr 2013 12:36:22 +0200 (CEST)	[thread overview]
Message-ID: <Pine.LNX.4.64.1304081234050.29945@axis700.grange> (raw)
In-Reply-To: <5147934D.2040908@gmail.com>

On Mon, 18 Mar 2013, Sylwester Nawrocki wrote:

[snip]

> > +unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk)
> > +{
> > +	if (!clk->ops->get_rate)
> > +		return -ENOSYS;
> 
> I guess we should just WARN if this callback is null and return 0
> or return value type of this function needs to be 'long'. Otherwise
> we'll get insanely large frequency value by casting this error code
> to unsigned long.

Comparing to the CCF: AFAICS, they do the same, you're supposed to use 
IS_ERR_VALUE() on the clock rate, obtained from clk_get_rate().

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/

  parent reply	other threads:[~2013-04-08 10:36 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-15 21:27 [PATCH v6 0/7] V4L2 clock and async patches and soc-camera example Guennadi Liakhovetski
2013-03-15 21:27 ` Guennadi Liakhovetski
2013-03-15 21:27 ` [PATCH v6 1/7] media: V4L2: add temporary clock helpers Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-18 22:21   ` Sylwester Nawrocki
2013-03-18 22:21     ` Sylwester Nawrocki
2013-03-19  7:32     ` Guennadi Liakhovetski
2013-03-19  7:32       ` Guennadi Liakhovetski
2013-03-19  9:52       ` Sylwester Nawrocki
2013-03-19  9:52         ` Sylwester Nawrocki
2013-03-19 10:27         ` Guennadi Liakhovetski
2013-03-19 10:27           ` Guennadi Liakhovetski
2013-03-26 23:09           ` Laurent Pinchart
2013-03-26 23:09             ` Laurent Pinchart
2013-03-26 23:08         ` Laurent Pinchart
2013-03-26 23:08           ` Laurent Pinchart
2013-04-08 10:36     ` Guennadi Liakhovetski [this message]
2013-04-08 10:36       ` Guennadi Liakhovetski
2013-04-08 15:20       ` Sylwester Nawrocki
2013-04-08 15:20         ` Sylwester Nawrocki
2013-03-21  8:19   ` Prabhakar Lad
2013-03-21  8:31     ` Prabhakar Lad
2013-03-21  9:10     ` Anatolij Gustschin
2013-03-21  9:10       ` Anatolij Gustschin
2013-03-21  9:13       ` Prabhakar Lad
2013-03-21  9:25         ` Prabhakar Lad
2013-03-15 21:27 ` [PATCH v6 2/7] media: V4L2: support asynchronous subdevice registration Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-26 23:41   ` Laurent Pinchart
2013-03-26 23:41     ` Laurent Pinchart
2013-03-15 21:27 ` [PATCH v6 3/7] media: soc-camera: switch I2C subdevice drivers to use v4l2-clk Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-18  7:47   ` Hans Verkuil
2013-03-18  7:47     ` Hans Verkuil
2013-03-18 10:08     ` Guennadi Liakhovetski
2013-03-18 10:08       ` Guennadi Liakhovetski
2013-03-18 10:23       ` Hans Verkuil
2013-03-18 10:23         ` Hans Verkuil
2013-03-18 22:48         ` Sylwester Nawrocki
2013-03-18 22:48           ` Sylwester Nawrocki
2013-03-26 23:54   ` Laurent Pinchart
2013-03-26 23:54     ` Laurent Pinchart
2013-04-08 10:53     ` Guennadi Liakhovetski
2013-04-08 10:53       ` Guennadi Liakhovetski
2013-03-15 21:27 ` [PATCH v6 4/7] soc-camera: add V4L2-async support Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-15 21:27 ` [PATCH v6 5/7] sh_mobile_ceu_camera: add asynchronous subdevice probing support Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-15 21:27 ` [PATCH v6 6/7] imx074: support asynchronous probing Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-15 21:27 ` [PATCH v6 7/7] ARM: shmobile: convert ap4evb to asynchronously register camera subdevices Guennadi Liakhovetski
2013-03-15 21:27   ` Guennadi Liakhovetski
2013-03-19  3:36   ` Simon Horman
2013-03-19  3:36     ` Simon Horman

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