From mboxrd@z Thu Jan  1 00:00:00 1970
From: b29396@freescale.com (Dong Aisheng)
Date: Tue, 4 Sep 2012 19:46:02 +0800
Subject: [PATCH v5 1/4] mfd: add syscon driver based on regmap
In-Reply-To: <20120904113545.GD4657@jack.whiskey>
References: <1346728811-25788-1-git-send-email-b29396@freescale.com>
 <1346728811-25788-2-git-send-email-b29396@freescale.com>
 <20120904113545.GD4657@jack.whiskey>
Message-ID: <20120904114601.GB13046@shlinux2.ap.freescale.net>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, Sep 04, 2012 at 07:35:45PM +0800, Andi Shyti wrote:
> Hi Dong,
> 
> On Tue, Sep 04, 2012 at 11:20:08AM +0800, Dong Aisheng wrote:
> > +static int __devinit syscon_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> 
> Do we really need this variable? Anyway you are using it only
> once in the dev_info.
> 
Okay, i can remove it.

> > +	struct device_node *np = dev->of_node;
> > +	struct syscon *syscon;
> > +	struct resource res;
> > +	int ret;
> > +
> > +	if (!np)
> > +		return -ENOENT;
> > +
> > +	syscon = devm_kzalloc(&pdev->dev, sizeof(struct syscon),
> > +			    GFP_KERNEL);
> > +	if (!syscon)
> > +		return -ENOMEM;
> > +
> > +	syscon->base = of_iomap(np, 0);
> > +	if (!syscon->base)
> > +		return -EADDRNOTAVAIL;
> > +
> > +	ret = of_address_to_resource(np, 0, &res);
> > +	if (ret)
> > +		return ret;
> > +
> > +	syscon_regmap_config.max_register = res.end - res.start - 3;
> > +	syscon->regmap = devm_regmap_init_mmio(&pdev->dev, syscon->base,
> > +					&syscon_regmap_config);
> > +	if (IS_ERR(syscon->regmap)) {
> > +		dev_err(&pdev->dev, "regmap init failed\n");
> > +		return PTR_ERR(syscon->regmap);
> > +	}
> > +
> > +	syscon->dev = &pdev->dev;
> > +	platform_set_drvdata(pdev, syscon);
> > +
> > +	dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
> > +		res.start, res.end);
> > +
> > +	return 0;
> 
> in case of error you are not freeing syscon.
Do we need it for managed resource of syscon?

> Moreover, in my opinion, some dev_err more should not heart
> 
There's no much error cases here, most of them rarely fails and i don't feel
we really need add.
I don't know what dev_err you suggested to add?

Regards
Dong Aisheng