linux-kernel - Re: [PATCH 3/4] net: mvneta: mmc: get optional axi clk

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Message-ID: <20160120165319.5ee8589a@xhacker>
Date:	Wed, 20 Jan 2016 16:53:19 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	<davem@...emloft.net>, <mw@...ihalf.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <sebastian.hesselbarth@...il.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/4] net: mvneta: mmc: get optional axi clk

On Wed, 20 Jan 2016 09:51:32 +0100 Thomas Petazzoni wrote:

> Dear Jisheng Zhang,
> 
> On Wed, 20 Jan 2016 16:06:22 +0800, Jisheng Zhang wrote:
> > Some platforms may provide more than one clk for the mvneta IP, for
> > example Marvell BG4CT provides "core" clk for the mac core, and
> > "axi" clk for the AXI bus logic. Obviously this "axi" clk also need to
> > be enabled. This patch adds this optional "axi" clk support.
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>  
> 
> Typo in the title, you have "mmc: ", while this patch is not related to
> MMC, unless I'm missing something and MMC means something else in this
> context.

oops, thanks for pointing out this.

> 
> >  	clk_prepare_enable(pp->clk);
> >  
> > +	pp->clk_axi = devm_clk_get(&pdev->dev, "axi");
> > +	if (!IS_ERR(pp->clk_axi))
> > +		clk_prepare_enable(pp->clk_axi);
> > +
> >  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  	pp->base = devm_ioremap_resource(&pdev->dev, res);
> >  	if (IS_ERR(pp->base)) {
> > @@ -3727,6 +3733,7 @@ err_free_ports:
> >  	free_percpu(pp->ports);
> >  err_clk:
> >  	clk_disable_unprepare(pp->clk);
> > +	clk_disable_unprepare(pp->clk_axi);  
> 
> For the error paths and cleanup steps, I very much prefer when things
> are done in the opposite order of the allocation/creation steps. So can
> you clk_disable_unprepare() the AXI clock before the core clock ?

Both are fine. But I agree with your prefer. Will cook a v2 soon

Thanks for reviewing.

> 
> >  err_put_phy_node:
> >  	of_node_put(phy_node);
> >  err_free_irq:
> > @@ -3744,6 +3751,7 @@ static int mvneta_remove(struct platform_device *pdev)
> >  
> >  	unregister_netdev(dev);
> >  	clk_disable_unprepare(pp->clk);
> > +	clk_disable_unprepare(pp->clk_axi);  
> 
> Ditto.
> 
> Thanks!
> 
> Thomas