linux-kernel - Re: [PATCH] memory: mtk-smi: Use of_device_get_match

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Date:   Wed, 26 Jul 2017 20:35:27 +0800
From:   Honghui Zhang <honghui.zhang@...iatek.com>
To:     Robin Murphy <robin.murphy@....com>
CC:     <joro@...tes.org>, <matthias.bgg@...il.com>, <robh@...nel.org>,
        <srv_heupstream@...iatek.com>, <catalin.marinas@....com>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <youlin.pei@...iatek.com>,
        <erin.lo@...iatek.com>
Subject: Re: [PATCH] memory: mtk-smi: Use of_device_get_match_data helper

On Wed, 2017-07-26 at 11:36 +0100, Robin Murphy wrote:
> On 26/07/17 10:59, honghui.zhang@...iatek.com wrote:
> > From: Honghui Zhang <honghui.zhang@...iatek.com>
> > 

> >  	 * for mtk smi gen 1, we need to get the ao(always on) base to config
> >  	 * m4u port, and we need to enable the aync clock for transform the smi
> >  	 * clock into emi clock domain, but for mtk smi gen2, there's no smi ao
> >  	 * base.
> >  	 */
> > -	smi_gen = (enum mtk_smi_gen)of_id->data;
> > -	if (smi_gen == MTK_SMI_GEN1) {
> > +	smi_gen = of_device_get_match_data(dev);
> 
> The data you're retrieving is the exact same thing as of_id->data was,
> i.e. an enum mtk_smi_gen cast to void*, so dereferencing it is not a
> good idea. The first patch was almost right; you just need to keep the
> cast in the assignment to smi_gen.
> 
> Robin.
> 
Hi, Robin, thanks very much.
I will send a new version.

> > +	if (*smi_gen == MTK_SMI_GEN1) {
> >  		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  		common->smi_ao_base = devm_ioremap_resource(dev, res);
> >  		if (IS_ERR(common->smi_ao_base))
> > 
>