linux-kernel - Re: [PATCH v5 2/3] mfd: qcom-rpm: Driver for the Qualcomm RPM

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Message-ID: <20140822012748.GB12494@sonymobile.com>
Date:	Thu, 21 Aug 2014 18:27:49 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Rob Herring <robh+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Andy Gross <agross@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Kevin Hilman <khilman@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	Josh Cartwright <joshc@...eaurora.org>,
	"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>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v5 2/3] mfd: qcom-rpm: Driver for the Qualcomm RPM

On Thu 21 Aug 06:22 PDT 2014, Lee Jones wrote:
> > diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
> > +static const struct qcom_rpm_data msm8660_template = {
> > +	.version = -1,
> 
> -1?
> 

2 would be a better number...

> > +	.resource_table = msm8660_rpm_resource_table,
> > +	.n_resources = ARRAY_SIZE(msm8660_rpm_resource_table),
> > +};
> 
> [...]
> 
> > +struct qcom_rpm *dev_get_qcom_rpm(struct device *dev)
> > +{
> > +	return dev_get_drvdata(dev);
> > +}
> > +EXPORT_SYMBOL(dev_get_qcom_rpm);
> 
> No need for this at all.  Use dev_get_drvdata() direct instead.
> 

I see that others have put this as static inline in the header file, so I will
follow that. I don't want to expose this directly in the implementation of the
clients.

Let me know if you object.

> [...]
> 
> > +static int qcom_rpm_probe(struct platform_device *pdev)
> > +{
[...]
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	rpm->status_regs = devm_ioremap_resource(&pdev->dev, res);
> > +	rpm->ctrl_regs = rpm->status_regs + 0x400;
> > +	rpm->req_regs = rpm->status_regs + 0x600;
> > +	if (IS_ERR(rpm->status_regs))
> > +		return PTR_ERR(rpm->status_regs);
> 
> You should probably do this _before_ using it above.
> 

There's no difference in behaviour, but it just feels cleaner than:

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rpm->status_regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rpm->status_regs))
	return PTR_ERR(rpm->status_regs);
rpm->ctrl_regs = rpm->status_regs + 0x400;
rpm->req_regs = rpm->status_regs + 0x600;

If you don't like it, I'll change it.

[...]
> > +
> > +	writel(fw_version[0], RPM_CTRL_REG(rpm, 0));
> > +	writel(fw_version[1], RPM_CTRL_REG(rpm, 1));
> > +	writel(fw_version[2], RPM_CTRL_REG(rpm, 2));
> 
> A comment documenting what this is doing would be helpful here.
> 

Sounds reasonable, this seems to be incorrect now that I had to investigate
what's really happening. So I'll update it.

[...]
> > +}
> > +
> > +static int qcom_rpm_remove_child(struct device *dev, void *unused)
> > +{
> > +	platform_device_unregister(to_platform_device(dev));
> > +	return 0;
> > +}
> > +
> > +static int qcom_rpm_remove(struct platform_device *pdev)
> > +{
> > +	device_for_each_child(&pdev->dev, NULL, qcom_rpm_remove_child);
> 
> of_platform_depopulate()?
> 

Forgot that we had that now, will update.

> > +	return 0;
> > +}
> > +
> > +static struct platform_driver qcom_rpm_driver = {
> > +	.probe = qcom_rpm_probe,
> > +	.remove = qcom_rpm_remove,
> > +	.driver  = {
> > +		.name  = "qcom_rpm",
> > +		.owner = THIS_MODULE,
> 
> Remove this line, it's taken care of for you.
> 

OK

> > +		.of_match_table = qcom_rpm_of_match,
> > +	},
> > +};
> > +
> > +static int __init qcom_rpm_init(void)
> > +{
> > +	return platform_driver_register(&qcom_rpm_driver);
> > +}
> > +arch_initcall(qcom_rpm_init);
> > +
> > +static void __exit qcom_rpm_exit(void)
> > +{
> > +	platform_driver_unregister(&qcom_rpm_driver);
> > +}
> > +module_exit(qcom_rpm_exit)
> > +
> > +MODULE_DESCRIPTION("Qualcomm Resource Power Manager driver");
> > +MODULE_LICENSE("GPL v2");
> 
> No one authored this driver?
> 

Thought that was optional, will update.


Thanks for the review!

Regards,
Bjorn
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