Date: Tue, 4 Aug 2015 16:49:30 +0800
From: Leo Yan <leo.yan@linaro.org>
To: Paul Bolle <pebolle@tiscali.nl>
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Jassi Brar <jassisinghbrar@gmail.com>, Wei Xu <xuwei5@hisilicon.com>,
        Bintian Wang <bintian.wang@huawei.com>,
        Haojian Zhuang <haojian.zhuang@linaro.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Guodong Xu <guodong.xu@linaro.org>,
        Jian Zhang <zhangjian001@hisilicon.com>,
        Zhenwei Wang <Zhenwei.wang@hisilicon.com>,
        Haoju Mo <mohaoju@hisilicon.com>, Dan Zhao <dan.zhao@hisilicon.com>,
        kongfei@hisilicon.com, Guangyue Zeng <zengguangyue@hisilicon.com>
Subject: Re: [RFC PATCH 2/3] mailbox: Hisilicon: add mailbox driver
Message-ID: <20150804084930.GA27609@leoy-linaro>
References: <1438564390-28111-1-git-send-email-leo.yan@linaro.org>
 <1438564390-28111-3-git-send-email-leo.yan@linaro.org>
 <1438677024.8734.24.camel@tiscali.nl>
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Hi Paul,

On Tue, Aug 04, 2015 at 10:30:24AM +0200, Paul Bolle wrote:
> (This RFC was part of this mornings catch of my crude mail filter. So,
> for what it's worth, what follows are a few random comments for the few
> things I'm able to spot.)
> 
> On ma, 2015-08-03 at 09:13 +0800, Leo Yan wrote:
> > --- /dev/null
> > +++ b/drivers/mailbox/hisilicon/Kconfig
> 
> > +config HISI_MBOX
> > +	bool "Hisilicon's Mailbox"
> > +	depends on ARCH_HISI || OF
> 
> ARCH_HISI is available on either ARM64 or ARM. ARM64 selects OF. On ARM
> ARCH_HISI depends on ARCH_MULTIV7 which depends on ARCH_MULTIPLATFORM.
> That selects USE_OF which on its turn selects OF.
> 
> So, HISI_MBOX implies OF, correct?

Exactly, will simply use "depends on ARCH_HISI".

> > +	help
> > +	  Support for mailbox drivers on Hisilicon series of SoCs.
> > +
> > +config HI6220_MBOX
> > +	tristate "Hi6220 Mailbox Controller"
> > +	depends on HISI_MBOX
> > +	help
> > +	  An implementation of the hi6220 mailbox. It is used to send message
> > +	  between application processors and MCU. Say Y here if you want to build
> > +	  the Hi6220 mailbox controller driver.
> 
> > --- /dev/null
> > +++ b/drivers/mailbox/hisilicon/common.c
> 
> > +int hisi_mbox_register(struct hisi_mbox_hw *mbox_hw)
> > +{
> > +	[...]
> > +
> > +	mbox->chan = devm_kzalloc(dev,
> > +		mbox_hw->chan_num * sizeof(struct mbox_chan), GFP_KERNEL);
> > +	if (!mbox)
> 
> 	if (!mbox->chan)

Will fix.

> > +		return -ENOMEM;
> > +
> > +	[...]
> > +}
> 
> > --- /dev/null
> > +++ b/drivers/mailbox/hisilicon/hi6220-mailbox.c
> 
> > +static struct platform_driver hi6220_mbox_driver = {
> > +	.driver = {
> > +		[...]
> > +		.of_match_table = of_match_ptr(hi6220_mbox_of_match),
> 
> of_match_ptr(x) becomes NULL when CONFIG_OF is not defined. But I think
> CONFIG_OF will always be defined, see above. So of_match_ptr() isn't per
> se needed.

Will fix.

> > +	},
> > +	[...]
> > +};
> 
> > +static int __init hi6220_mbox_init(void)
> > +{
> > +	return platform_driver_register(&hi6220_mbox_driver);
> > +}
> > +module_init(hi6220_mbox_init);
> > +
> > +static void __exit hi6220_mbox_exit(void)
> > +{
> > +	platform_driver_unregister(&hi6220_mbox_driver);
> > +}
> > +module_exit(hi6220_mbox_exit);
> 
> This could be flattened into one line:
>     module_platform_driver(hi6220_mbox_driver);

Will refine. And thanks a lot for your review.

Thanks,
Leo Yan
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