linux-kernel - Re: [PATCH v2 4/6] soc: mediatek: Add SMI driver

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Message-ID: <CABuKBe+FmAzr_Cu=fUDwDHYzH4mW_2p4z1SYmp7+W=Tu-MLEuA@mail.gmail.com>
Date:	Thu, 21 May 2015 09:30:19 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Yong Wu <yong.wu@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-mediatek@...ts.infradead.org,
	Sasha Hauer <kernel@...gutronix.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	iommu@...ts.linux-foundation.org, Paul Bolle <pebolle@...cali.nl>,
	Arnd Bergmann <arnd@...db.de>, mitchelh@...eaurora.org,
	k.zhang@...iatek.com, youhua.li@...iatek.com
Subject: Re: [PATCH v2 4/6] soc: mediatek: Add SMI driver

2015-05-21 8:16 GMT+02:00 Yong Wu <yong.wu@...iatek.com>:
> Hi Matthias,
>      Thanks very much for your suggestion.
>      Abort the smi clock name, Could you help check below.
>      The others I will improve in next time.
>
> On Tue, 2015-05-19 at 13:14 +0200, Matthias Brugger wrote:
>> 2015-05-15 11:43 GMT+02:00 Yong Wu <yong.wu@...iatek.com>:
>> >     This patch add SMI(Smart Multimedia Interface) driver. This driver is
>> > responsible to enable/disable iommu and control the clocks of each local arbiter.
>> >
> [snip]
>> > +
>> > +#define SMI_LARB_MMU_EN                (0xf00)
>> > +#define F_SMI_MMU_EN(port)     (1 << (port))
>> > +
>> > +enum {
>> > +       MTK_CLK_APB,
>> > +       MTK_CLK_SMI,
>> > +       MTK_CLK_MAX,
>>
>> Maybe add something like:
>> MTK_CLK_FIRST = MTK_CLK_APB,
>> to make the for loops better readable.
>>
> Then, Is it like this? :
>  enum {
>         MTK_CLK_FIRST = MTK_CLK_APB,
>         MTK_CLK_SMI,
>         MTK_CLK_MAX,
>  }
> or the CLK_SMI also need MTK_CLK_SECOND = MTK_CLK_SMI.


something like:
enum {
         MTK_CLK_FIRST,
         MTK_CLK_APB = MTK_CLK_FIRST,
         MTK_CLK_SMI,
         MTK_CLK_LAST,
}

So you can rewrite the for loop:
if (i = MTK_CLK_FIRST; i < MTK_CLK_LAST; i++)

Regards,
Matthias

>> > +};
>> > +
>> > +struct mtk_smi_common {
>> > +       void __iomem            *base;
>>
>> That seems to be never used. Please delete it.
>>
>> > +       struct clk              *clk[MTK_CLK_MAX];
>> > +};
>> > +
>> > +struct mtk_smi_larb {
>> > +       void __iomem            *base;
>> > +       spinlock_t              portlock; /* lock for config port */
>> > +       struct clk              *clk[MTK_CLK_MAX];
>> > +       struct device           *smi;
>> > +};
>> > +
>> Thanks,
>> Matthias
>
>



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