linux-kernel - Re: [RFC v2 1/8] TILER-DMM: DMM-PAT driver for TI TILER

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Date:	Thu, 2 Dec 2010 10:46:20 +0530
From:	"Varadarajan, Charulatha" <charu@...com>
To:	"Kanigeri, Hari" <h-kanigeri2@...com>
Cc:	David Sin <davidsin@...com>, Greg KH <greg@...ah.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Lajos Molnar <molnar@...com>
Subject: Re: [RFC v2 1/8] TILER-DMM: DMM-PAT driver for TI TILER

On Thu, Dec 2, 2010 at 07:57, Kanigeri, Hari <h-kanigeri2@...com> wrote:
> On Wed, Dec 1, 2010 at 8:10 PM, Kanigeri, Hari <h-kanigeri2@...com> wrote:
>> On Wed, Dec 1, 2010 at 12:04 AM, Varadarajan, Charulatha <charu@...com> wrote:
>>> David,
>>
>>>
>>>> +               if (!oh)
>>>> +                       goto error;
>>>> +
>>>> +               data->base = oh->_mpu_rt_va;
>>>
>>> not required. Make use of platform_get APIs in probe to extract the
>>> base, dma and irq info using pdev.
>>
>> Not sure about using platform_get APIs. I think one has to use
>> omap_hwmod_get_mpu_rt_va to get the address, which internally returns
>> oh-<_mpu_rt_va.
> small correction... omap_device_get_rt_va and not omap_hwmod_get_mpu_rt_va.

To get the base address & irq, you need not have to use
omap_device_get_rt_va and pass it as
pdata and then use it during probe. Instead in probe, you may do
something like the following:

static int __devinit  dev_probe (*pdev) {
   struct resource *res;
   void __iomem *base;
   u16 irq;
   ....
   ....
   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
   if (unlikely(!res)) {
              ....
              return -ENODEV;
   }

   base = ioremap(res->start, resource_size(res));
   if (base) {
               ....
               return -ENOMEM;
   }

   res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
   if (unlikely(!res)) {
               ....
               return -ENODEV;
   }
   irq = res->start;
   ....
   ....
}

-V Charulatha
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