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From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/4] clk: Implement clk_set_rate
Date: Wed, 25 May 2011 19:03:47 +0000	[thread overview]
Message-ID: <20110525190347.GH22096@pengutronix.de> (raw)
In-Reply-To: <1305876469.326620.351525457111.2.gpush@pororo>

Hi Jeremy,

On Fri, May 20, 2011 at 03:27:49PM +0800, Jeremy Kerr wrote:
> Implemenent clk_set_rate by adding a set_rate callback to clk_hw_ops,
> and core code to handle propagation of rate changes up and down the
> clock tree.
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
> 
> +
> +propagate:
> +	ret = clk->ops->set_rate(clk->hw, new_rate, &parent_rate);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	/* ops->set_rate may require the parent's rate to change (to
> +	 * parent_rate), we need to propagate the set_rate call to the
> +	 * parent.
> +	 */
> +	if (ret = CLK_SET_RATE_PROPAGATE) {
> +		new_rate = parent_rate;
> +		clk = clk->parent;
> +		goto propagate;
> +	}

I'm unsure about this one. Every clock should have the ability to stop
or continue the rate propagation to the parent. This suggests to leave
the decision whether or not to propagate to the core and not to the
individual clocks.
Right now each mux/div/gate needs an individual propagate flag. By
adding the flag to the core the building block implementations could be
simpler and the knowledge about propagatability might become handy for
the core later.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

WARNING: multiple messages have this Message-ID
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-sh@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 2/4] clk: Implement clk_set_rate
Date: Wed, 25 May 2011 21:03:47 +0200	[thread overview]
Message-ID: <20110525190347.GH22096@pengutronix.de> (raw)
In-Reply-To: <1305876469.326620.351525457111.2.gpush@pororo>

Hi Jeremy,

On Fri, May 20, 2011 at 03:27:49PM +0800, Jeremy Kerr wrote:
> Implemenent clk_set_rate by adding a set_rate callback to clk_hw_ops,
> and core code to handle propagation of rate changes up and down the
> clock tree.
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
> 
> +
> +propagate:
> +	ret = clk->ops->set_rate(clk->hw, new_rate, &parent_rate);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	/* ops->set_rate may require the parent's rate to change (to
> +	 * parent_rate), we need to propagate the set_rate call to the
> +	 * parent.
> +	 */
> +	if (ret == CLK_SET_RATE_PROPAGATE) {
> +		new_rate = parent_rate;
> +		clk = clk->parent;
> +		goto propagate;
> +	}

I'm unsure about this one. Every clock should have the ability to stop
or continue the rate propagation to the parent. This suggests to leave
the decision whether or not to propagate to the core and not to the
individual clocks.
Right now each mux/div/gate needs an individual propagate flag. By
adding the flag to the core the building block implementations could be
simpler and the knowledge about propagatability might become handy for
the core later.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

WARNING: multiple messages have this Message-ID
From: s.hauer@pengutronix.de (Sascha Hauer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/4] clk: Implement clk_set_rate
Date: Wed, 25 May 2011 21:03:47 +0200	[thread overview]
Message-ID: <20110525190347.GH22096@pengutronix.de> (raw)
In-Reply-To: <1305876469.326620.351525457111.2.gpush@pororo>

Hi Jeremy,

On Fri, May 20, 2011 at 03:27:49PM +0800, Jeremy Kerr wrote:
> Implemenent clk_set_rate by adding a set_rate callback to clk_hw_ops,
> and core code to handle propagation of rate changes up and down the
> clock tree.
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
> 
> +
> +propagate:
> +	ret = clk->ops->set_rate(clk->hw, new_rate, &parent_rate);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	/* ops->set_rate may require the parent's rate to change (to
> +	 * parent_rate), we need to propagate the set_rate call to the
> +	 * parent.
> +	 */
> +	if (ret == CLK_SET_RATE_PROPAGATE) {
> +		new_rate = parent_rate;
> +		clk = clk->parent;
> +		goto propagate;
> +	}

I'm unsure about this one. Every clock should have the ability to stop
or continue the rate propagation to the parent. This suggests to leave
the decision whether or not to propagate to the core and not to the
individual clocks.
Right now each mux/div/gate needs an individual propagate flag. By
adding the flag to the core the building block implementations could be
simpler and the knowledge about propagatability might become handy for
the core later.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

  parent reply	other threads:[~2011-05-25 19:03 UTC|newest]

Thread overview: 139+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-20  7:27 [PATCH 0/4] Add a generic struct clk Jeremy Kerr
2011-05-20  7:27 ` Jeremy Kerr
2011-05-20  7:27 ` Jeremy Kerr
2011-05-20  7:27 ` [PATCH 4/4] clk: Add simple gated clock Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20 11:37   ` Arnd Bergmann
2011-05-20 11:37     ` Arnd Bergmann
2011-05-20 11:37     ` Arnd Bergmann
2011-05-20 22:19   ` Rob Herring
2011-05-20 22:19     ` Rob Herring
2011-05-20 22:19     ` Rob Herring
2011-05-20  7:27 ` [PATCH 2/4] clk: Implement clk_set_rate Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20 12:25   ` Sascha Hauer
2011-05-20 12:25     ` Sascha Hauer
2011-05-20 12:25     ` Sascha Hauer
2011-05-24  7:59   ` Colin Cross
2011-05-24  7:59     ` Colin Cross
2011-05-24  7:59     ` Colin Cross
2011-05-25 19:03   ` Sascha Hauer [this message]
2011-05-25 19:03     ` Sascha Hauer
2011-05-25 19:03     ` Sascha Hauer
     [not found]     ` <1306373867.2875.162.camel@pororo>
2011-05-26  6:54       ` Sascha Hauer
2011-05-26  6:54         ` Sascha Hauer
2011-05-26  6:54         ` Sascha Hauer
2011-05-30  5:05   ` Mike Frysinger
2011-05-30  5:05     ` Mike Frysinger
2011-05-30  5:05     ` Mike Frysinger
2011-05-20  7:27 ` [PATCH 3/4] clk: Add fixed-rate clock Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-24  7:01   ` Francesco VIRLINZI
2011-05-30  5:01   ` Mike Frysinger
2011-05-30  5:01     ` Mike Frysinger
2011-05-30  5:01     ` Mike Frysinger
2011-05-30  5:02   ` Mike Frysinger
2011-05-30  5:02     ` Mike Frysinger
2011-05-30  5:02     ` Mike Frysinger
2011-05-20  7:27 ` [PATCH 1/4] clk: Add a generic clock infrastructure Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20  7:27   ` Jeremy Kerr
2011-05-20 11:59   ` Sascha Hauer
2011-05-20 11:59     ` Sascha Hauer
2011-05-20 11:59     ` Sascha Hauer
2011-05-20 13:25     ` Thomas Gleixner
2011-05-20 13:25       ` Thomas Gleixner
2011-05-20 13:25       ` Thomas Gleixner
2011-05-20 13:36       ` Sascha Hauer
2011-05-20 13:36         ` Sascha Hauer
2011-05-20 13:36         ` Sascha Hauer
2011-05-23 23:55   ` Colin Cross
2011-05-23 23:55     ` Colin Cross
2011-05-23 23:55     ` Colin Cross
2011-05-24  7:02     ` Sascha Hauer
2011-05-24  7:02       ` Sascha Hauer
2011-05-24  7:02       ` Sascha Hauer
2011-05-24  7:51       ` Colin Cross
2011-05-24  7:51         ` Colin Cross
2011-05-24  7:51         ` Colin Cross
2011-05-24  8:38         ` Sascha Hauer
2011-05-24  8:38           ` Sascha Hauer
2011-05-24  8:38           ` Sascha Hauer
2011-05-25 11:22           ` Richard Zhao
2011-05-25 11:22             ` Richard Zhao
2011-05-25 11:22             ` Richard Zhao
2011-05-25 11:43         ` Thomas Gleixner
2011-05-25 11:43           ` Thomas Gleixner
2011-05-25 11:43           ` Thomas Gleixner
2011-05-24  4:18   ` viresh kumar
2011-05-24  4:30     ` viresh kumar
2011-05-24  4:18     ` viresh kumar
2011-05-25 10:47   ` Richard Zhao
2011-05-25 10:47     ` Richard Zhao
2011-05-25 10:47     ` Richard Zhao
2011-05-30  5:00     ` Mike Frysinger
2011-05-30  5:00       ` Mike Frysinger
2011-05-30  5:00       ` Mike Frysinger
2011-05-23 23:12 ` [PATCH 0/4] Add a generic struct clk Colin Cross
2011-05-23 23:12   ` Colin Cross
2011-05-23 23:12   ` Colin Cross
2011-05-24  6:26   ` Sascha Hauer
2011-05-24  6:26     ` Sascha Hauer
2011-05-24  6:26     ` Sascha Hauer
2011-05-24  7:31     ` Colin Cross
2011-05-24  7:31       ` Colin Cross
2011-05-24  7:31       ` Colin Cross
2011-05-24  8:09       ` Sascha Hauer
2011-05-24  8:09         ` Sascha Hauer
2011-05-24  8:09         ` Sascha Hauer
2011-05-24 19:41         ` Colin Cross
2011-05-24 19:41           ` Colin Cross
2011-05-24 19:41           ` Colin Cross
2011-05-25  2:32           ` Richard Zhao
2011-05-25  2:32             ` Richard Zhao
2011-05-25  2:32             ` Richard Zhao
2011-05-25  6:23           ` Sascha Hauer
2011-05-25  6:23             ` Sascha Hauer
2011-05-25  6:23             ` Sascha Hauer
2011-05-25  7:51           ` Thomas Gleixner
2011-05-25  7:51             ` Thomas Gleixner
2011-05-25  7:51             ` Thomas Gleixner
2011-05-27 14:39           ` Mark Brown
2011-05-27 14:39             ` Mark Brown
2011-05-27 14:39             ` Mark Brown
2011-05-24 17:22   ` Richard Zhao
2011-05-24 17:22     ` Richard Zhao
2011-05-24 17:22     ` Richard Zhao
2011-05-24 17:52     ` Colin Cross
2011-05-24 17:52       ` Colin Cross
2011-05-24 17:52       ` Colin Cross
2011-05-25  2:08       ` Richard Zhao
2011-05-25  2:08         ` Richard Zhao
2011-05-25  2:08         ` Richard Zhao
2011-05-30  5:20 ` Mike Frysinger
2011-05-30  5:20   ` Mike Frysinger
2011-05-30  5:20   ` Mike Frysinger
2011-07-10  9:09 ` Mark Brown
2011-07-10  9:09   ` Mark Brown
2011-07-10  9:09   ` Mark Brown
2011-07-10  9:50   ` Russell King - ARM Linux
2011-07-10  9:50     ` Russell King - ARM Linux
2011-07-10  9:50     ` Russell King - ARM Linux
2011-07-10 10:00     ` Russell King - ARM Linux
2011-07-10 10:00       ` Russell King - ARM Linux
2011-07-10 10:00       ` Russell King - ARM Linux
2011-07-10 11:27     ` Mark Brown
2011-07-10 11:27       ` Mark Brown
2011-07-10 11:27       ` Mark Brown
2011-07-10 11:52       ` Russell King - ARM Linux
2011-07-10 11:52         ` Russell King - ARM Linux
2011-07-10 11:52         ` Russell King - ARM Linux
2011-07-11  2:49   ` Jeremy Kerr
2011-07-11  2:49     ` Jeremy Kerr
2011-07-11  2:49     ` Jeremy Kerr
2011-07-11  3:57     ` Mark Brown
2011-07-11  3:57       ` Mark Brown
2011-07-11  3:57       ` Mark Brown

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