Re: [PATCH 3/3] gpio: msm: Add device tree and irqdomain supportfor gpio-msm-v2

[Rohit Vaswani]

On 5/21/2013 2:06 PM, Stephen Boyd wrote:
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index 87d5670..f3c1978 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -165,7 +165,7 @@ config GPIO_MSM_V1
> >   
> >   config GPIO_MSM_V2
> >   	tristate "Qualcomm MSM GPIO v2"
> > -	depends on GPIOLIB && ARCH_MSM
> > +	depends on GPIOLIB && ARCH_MSM && OF
> This doesn't actually rely on ARCH_MSM anymore so I think we can
> drop that dependency.
Done.
> >   	help
> >   	  Say yes here to support the GPIO interface on ARM v7 based
> >   	  Qualcomm MSM chips.  Most of the pins on the MSM can be
> > @@ -222,7 +229,6 @@ static void msm_gpio_update_dual_edge_pos(unsigned gpio)
> >   		else
> >   			set_gpio_bits(BIT(INTR_POL_CTL), GPIO_INTR_CFG(gpio));
> >   		val2 = readl(GPIO_IN_OUT(gpio)) & BIT(GPIO_IN);
> > -		intstat = readl(GPIO_INTR_STATUS(gpio)) & BIT(INTR_STATUS);
> >   		if (intstat || val == val2)
> Looks like intstat is used uninitialized now?
Thanks for catching this. Will fix this.
> > +
> > +static int msm_gpio_probe(struct platform_device *pdev)
> > +{
> > +	int i, irq, ret, ngpio;
> > +	struct resource *res;
> > +
> > +	msm_gpio.gpio_chip.label = pdev->name;
> > +	msm_gpio.gpio_chip.dev = &pdev->dev;
> > +	of_property_read_u32(pdev->dev.of_node, "ngpio", &ngpio);
> Fail probe if the property isn't there?
Done.
> > +	msm_gpio.gpio_chip.ngpio = ngpio;
> > +
> > +	res = platform_get_resource(&pdev->dev, IORESOURCE_MEM, 0);
> > +	if (!res) {
> > +		dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
> > +		return -EINVAL;
> > +	}
> > +
> > +	msm_tlmm_base = devm_ioremap_resource(pdev->dev, res);
> > +	if (!msm_tlmm_base) {
> > +		dev_err(&pdev->dev, "Couldn't allocate memory for msm tlmm base\n");
> > +		return -ENOMEM;
> > +	}
> devm_ioremap_resource() returns an ERR_PTR on failure, not NULL.
> Also, it already prints messages on errors so you can drop all the
> prints around this. Just do
>
> 	res = platform_get_resource(&pdev->dev, IORESOURCE_MEM, 0);
> 	msm_tlmm_base = devm_ioremap_resource(pdev->dev, res);
> 	if (IS_ERR(msm_tlmm_base))
> 		return ERR_PTR(msm_tlmm_base);
>    
Done.
> >   static int __init msm_gpio_init(void)
> >   {
> > -	int rc;
> > -
> > -	rc = platform_driver_register(&msm_gpio_driver);
> > -	if (!rc) {
> > -		rc = platform_device_register(&msm_device_gpio);
> > -		if (rc)
> > -			platform_driver_unregister(&msm_gpio_driver);
> > -	}
> > -
> > -	return rc;
> > +	return platform_driver_register(&msm_gpio_driver);
> >   }
> >   
> >   static void __exit msm_gpio_exit(void)
> >   {
> > -	platform_device_unregister(&msm_device_gpio);
> >   	platform_driver_unregister(&msm_gpio_driver);
> >   }
> You could use module_platform_driver here now too.
Done. Thanks for the comments.

Thanks,
Rohit Vaswani

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