Hi Russell,
From: ext Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 3/6] omap iommu: omap3 iommu device registration
Date: Sat, 16 May 2009 11:20:36 +0200
> On Tue, May 05, 2009 at 03:47:00PM +0300, Hiroshi DOYU wrote:
> > +static struct resource omap3_iommu_res[] = {
> > + { /* Camera ISP MMU */
> > + .start = OMAP3_MMU1_BASE,
> > + .end = OMAP3_MMU1_BASE + MMU_REG_SIZE - 1,
> > + .flags = IORESOURCE_MEM,
> > + },
> > + {
> > + .start = OMAP3_MMU1_IRQ,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + { /* IVA2.2 MMU */
> > + .start = OMAP3_MMU2_BASE,
> > + .end = OMAP3_MMU2_BASE + MMU_REG_SIZE - 1,
> > + .flags = IORESOURCE_MEM,
> > + },
> > + {
> > + .start = OMAP3_MMU2_IRQ,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > +};
> > +#define NR_IOMMU_RES (ARRAY_SIZE(omap3_iommu_res) / 2)
>
> This looks all very convoluted. Why not do something like:
>
> static unsigned long iommu_base[] = {
> OMAP3_MMU1_BASE,
> OMAP3_MMU2_BASE,
> };
>
> static int iommu_irq[] = {
> OMAP3_MMU1_IRQ,
> OMAP3_MMU2_IRQ,
> };
>
> > +static struct platform_device *omap3_iommu_pdev[NR_IOMMU_DEVICES];
> > +
> > +static int __init omap3_iommu_init(void)
> > +{
> > + int i, err;
> > +
> > + for (i = 0; i < NR_IOMMU_DEVICES; i++) {
> > + struct platform_device *pdev;
> > +
> > + pdev = platform_device_alloc("omap-iommu", i + 1);
>
> Why number them 1 and up when zero is perfectly fine?
I just wanted to use the same expression in TRM. Actually no need to
start from 1.
>
> > + if (!pdev) {
> > + err = -ENOMEM;
> > + goto err_out;
> > + }
> > + err = platform_device_add_resources(pdev,
> > + &omap3_iommu_res[2 * i], NR_IOMMU_RES);
>
> struct resource res[2];
>
> res[0].start = iommu_base[i];
> res[0].end = iommu_base[i] + MMU_REG_SIZE - 1;
> res[0].flags = IORESOURCE_MEM;
> res[1].start = res[1].end = iommu_irq[i];
> res[1].flags = IORESOURCE_IRQ;
>
> err = platform_device_add_resources(pdev, &res, ARRAY_SIZE(res));
>
> There's no need to keep 'res' around since it's copied by
> add_resources.
OK.
>
> > + if (err)
> > + goto err_out;
> > + err = platform_device_add_data(pdev, &omap3_iommu_pdata[i],
> > + sizeof(omap3_iommu_pdata[0]));
> > + if (err)
> > + goto err_out;
> > + err = platform_device_add(pdev);
> > + if (err)
> > + goto err_out;
> > + omap3_iommu_pdev[i] = pdev;
> > + }
> > + return 0;
> > +
> > +err_out:
> > + while (i--)
> > + platform_device_put(omap3_iommu_pdev[i]);
> > + return err;
> > +}
> > +module_init(omap3_iommu_init);
> > +
> > +static void __exit omap3_iommu_exit(void)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < NR_IOMMU_DEVICES; i++)
> > + platform_device_unregister(omap3_iommu_pdev[i]);
> > +}
> > +module_exit(omap3_iommu_exit);
> > +
> > +MODULE_AUTHOR("Hiroshi DOYU");
> > +MODULE_DESCRIPTION("omap iommu: omap3 device registration");
> > +MODULE_LICENSE("GPL v2");
> >
> >
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