[U-Boot] [PATCH] video, ipu: make ldb clock frequenz overwriteable through board code

[Heiko Schocher <hs@denx.de>]

Hello Eric,

Am 16.04.2015 02:27, schrieb Eric Nelson:
> Hi Heiko,
>
> On 04/12/2015 01:19 AM, Heiko Schocher wrote:
>> the ldb clock can be setup in board code (for example set through PLL5).
>> Update the ldb_clock rate also through board code.
>>
>> This should be removed, if a clock framework is availiable.
>>
> Any chance you're up to the task?
>
> Searching for 'clk_get' in the sources shows a proliferation
> of attempts for various SOCs and drivers.

Yes ... but it seems, I get no time for such a job :-(

>> Signed-off-by: Heiko Schocher <hs@denx.de>
>> ---
>>
>>   drivers/video/ipu.h        |  1 +
>>   drivers/video/ipu_common.c | 11 +++++++++++
>>   2 files changed, 12 insertions(+)
>>
>> diff --git a/drivers/video/ipu.h b/drivers/video/ipu.h
>> index 091b58f..f13934f 100644
>> --- a/drivers/video/ipu.h
>> +++ b/drivers/video/ipu.h
>> @@ -266,4 +266,5 @@ void ipu_dp_uninit(ipu_channel_t channel);
>>   void ipu_dp_dc_disable(ipu_channel_t channel, unsigned char swap);
>>   ipu_color_space_t format_to_colorspace(uint32_t fmt);
>>
>
> I'd rather see this in imx-common/video.h to avoid #includes
> out of the driver tree.

ok, moved.

>> +int ipu_set_ldb_clock(int rate);
>>   #endif
>> diff --git a/drivers/video/ipu_common.c b/drivers/video/ipu_common.c
>> index 1a209d4..dc054bc 100644
>> --- a/drivers/video/ipu_common.c
>> +++ b/drivers/video/ipu_common.c
>> @@ -1198,3 +1198,14 @@ ipu_color_space_t format_to_colorspace(uint32_t fmt)
>>   	}
>>   	return RGB;
>>   }
>> +
>> +/* should removed when clk framework is availiable */
>> +int ipu_set_ldb_clock(int rate)
>> +{
>
> This forces a tight dependency on when this is called that
> using ldb_clk directly would prevent.

Sorry, did not understand you here ...

>> +	if (g_ldb_clk == NULL)
>> +		return -ENOENT;
>> +
>> +	g_ldb_clk->rate = rate;
>> +
>> +	return 0;
>> +}
>>
>
> The use of g_ldb_clk seems pretty dodgy everywhere in the
> IPU driver.
>
> Otherwise:
>
> Tested-by: Eric Nelson <eric.nelson@boundarydevices.com>

Thanks for testing.

bye,
Heiko
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