[PATCH 3/4] plat-s5p: Add platform support for MIPI-CSI2 devices

[Jassi Brar]

On Fri, Dec 3, 2010 at 2:39 AM, Sylwester Nawrocki
<s.nawrocki at samsung.com> wrote:
>
> Hi Jamie,
>
> On 12/02/2010 06:15 PM, Jamie Iles wrote:
>> Hi Sylwester,
>>
>> On Thu, Dec 02, 2010 at 05:37:41PM +0100, Sylwester Nawrocki wrote:
>>> diff --git a/arch/arm/plat-s5p/dev-csis0.c b/arch/arm/plat-s5p/dev-csis0.c
>>> new file mode 100644
>>> index 0000000..2b1ba43
>>> --- /dev/null
>>> +++ b/arch/arm/plat-s5p/dev-csis0.c
>>> @@ -0,0 +1,34 @@
>>> +/*
>>> + * Copyright (C) 2010 Samsung Electronics
>>> + *
>>> + * S5P series device definition for MIPI-CSI device 0
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> +*/
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/platform_device.h>
>>> +#include <mach/map.h>
>>> +
>>> +static struct resource s5p_csis_resource[] = {
>>> +    [0] = {
>>> +            .start = S5P_PA_CSIS0,
>>> +            .end   = S5P_PA_CSIS0 + SZ_4K - 1,
>>> +            .flags = IORESOURCE_MEM,
>>> +    },
>>> +    [1] = {
>>> +            .start = IRQ_MIPICSI0,
>>> +            .end   = IRQ_MIPICSI0,
>>> +            .flags = IORESOURCE_IRQ,
>>> +    }
>>> +};
>> Do you really need the [0] and [1] here? These are only needed if you are
>> sparsely initialising an array.
>
> I agree explicit indices are not really needed. I just followed the style of
> all other resource definitions already there.
> I am not quite sure what is the preference of the maintainer, I guess they want
> all devices to follow same style for consistence.

And that style has its origin because explicit indices are as because
they stress the fact that
drivers expect  a particular resource at a particular index (when we
have more than 1
resource of a type).
IMO we should use some macro shared between platform devices and their drivers.
Something like -
static struct resource s5p_csis_resource[] = {
       [PA_CSIS] = {
               .start = S5P_PA_CSIS0,
               .end   = S5P_PA_CSIS0 + SZ_4K - 1,
               .flags = IORESOURCE_MEM,
       },
       [IRQ_CSIS] = {
               .start = IRQ_MIPICSI0,
               .end   = IRQ_MIPICSI0,
               .flags = IORESOURCE_IRQ,
       }
};