linux-kernel - Re: [PATCH 5/7] clk: sunxi: add PRCM (Power/Reset/Clock Management) clks support

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Message-ID: <20140508024520.GH7047@lukather>
Date:	Wed, 7 May 2014 21:45:20 -0500
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Emilio López <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, Chen-Yu Tsai <wens@...e.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	Hans de Goede <hdegoede@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH 5/7] clk: sunxi: add PRCM (Power/Reset/Clock Management)
 clks support

On Wed, May 07, 2014 at 07:12:30PM +0200, Boris BREZILLON wrote:
> 
> On 29/04/2014 01:40, Maxime Ripard wrote:
> > On Mon, Apr 28, 2014 at 04:58:48PM +0200, Boris BREZILLON wrote:
> >> The PRCM (Power/Reset/Clock Management) unit provides several clock
> >> devices:
> >> - AR100 clk: used to clock the Power Management co-processor
> >> - AHB0 clk: used to clock the AHB0 bus
> >> - APB0 clk and gates: used to clk
> > Used to clk?
> "Used to clk peripherals connected on the APB0 bus"
> 
> I'll add the missing words in the next version :-).
> 
> >
> [...]
> > Ditto.
> >
> > And you'll probably want to use devm_ioremap_resource when you'll have
> > a single clock for the AR100.
> 
> Absolutely.
> 
> >
> >> +
> >> +	clk_parent = of_clk_get_parent_name(np, 0);
> >> +	if (!clk_parent)
> >> +		return -EINVAL;
> [...]
> >> +
> >> +static struct platform_driver sun6i_a31_prcm_clk_driver = {
> >> +	.driver = {
> >> +		.name = "sun6i-a31-prcm-clk",
> >> +		.owner = THIS_MODULE,
> >> +		.of_match_table = sun6i_a31_prcm_clk_dt_ids,
> >> +	},
> >> +	.probe = sun6i_a31_prcm_clk_probe,
> > You're not calling the of_clk_del_provider, and you should probably
> > unregister your clocks too.
> 
> This driver cannot be compiled as a module, and as a result the probed
> clks will never be removed.
> 
> Do you really want to support clk removal for this HW block ?

Hmm, no, then it's fine.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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