[U-Boot] [PATCH v2 07/12] exynos5: support tps65090 pmic

[Minkyu Kang <mk7.kang@samsung.com>]

On 22/05/14 03:58, Simon Glass wrote:
> Hi Minkyu,
> 
> On 21 May 2014 00:05, Minkyu Kang <mk7.kang@samsung.com> wrote:
>> On 20/05/14 20:47, Simon Glass wrote:
>>> Hi Minkyu,
>>>
>>> On 15 May 2014 00:51, Minkyu Kang <mk7.kang@samsung.com> wrote:
>>>> On 03/04/14 08:24, Simon Glass wrote:
>>>>> From: Aaron Durbin <adurbin@chromium.org>
>>>>>
>>>>> The TSP65090 is a PMIC on some exynos5 boards. The init function is
>>>>> called for the TPS65090 pmic. If that device is not a part of the device
>>>>> tree (returns -ENODEV) then continue. Otherwise return a failure.
>>>>>
>>>>> Signed-off-by: Aaron Durbin <adurbin@chromium.org>
>>>>> Signed-off-by: Simon Glass <sjg@chromium.org>
>>>>> Reviewed-by: Simon Glass <sjg@chromium.org>
>>>>> ---
>>>>>
>>>>> Changes in v2:
>>>>> - Move code to exynos5-dt.c
>>>>> - Fix comment style
>>>>> - Add #ifdef around tps65090 code
>>>>>
>>>>>  board/samsung/smdk5250/exynos5-dt.c | 13 +++++++++++++
>>>>>  1 file changed, 13 insertions(+)
>>>>>
>>>>> diff --git a/board/samsung/smdk5250/exynos5-dt.c b/board/samsung/smdk5250/exynos5-dt.c
>>>>> index 1a64b9b..2c1cf8a 100644
>>>>> --- a/board/samsung/smdk5250/exynos5-dt.c
>>>>> +++ b/board/samsung/smdk5250/exynos5-dt.c
>>>>> @@ -20,6 +20,7 @@
>>>>>  #include <asm/arch/sromc.h>
>>>>>  #include <power/pmic.h>
>>>>>  #include <power/max77686_pmic.h>
>>>>> +#include <power/tps65090_pmic.h>
>>>>>  #include <tmu.h>
>>>>>
>>>>>  DECLARE_GLOBAL_DATA_PTR;
>>>>> @@ -164,7 +165,19 @@ int exynos_power_init(void)
>>>>>
>>>>>  #ifdef CONFIG_POWER_MAX77686
>>>>>       ret = max77686_init();
>>>>> +     if (ret)
>>>>> +             return ret;
>>>>>  #endif
>>>>> +#ifdef CONFIG_POWER_TPS65090
>>>>> +     /*
>>>>> +      * The TPS65090 may not be in the device tree. If so, it is not
>>>>> +      * an error.
>>>>
>>>> Then, how we can initialise the tps65090?
>>>
>>> It is initialised if a suitable node is found in the device tree. If
>>> the device tree does not have it, then the hardware is assumed to not
>>> have this chip.
>>
>> then I think, it's an error.
>> Why you said, it is not an error?
> 
> I may be misunderstanding your question, but I'll try to answer what I
> think you are asking.
> 
> The device tree contains nodes for hardware in the machine that you
> want to initialise, and information about each one. Devices can be
> enabled or disabled by including or removing this information from the
> device tree (or marking a device disabled with a status = "disabled"
> property in the node).
> 
> The tps65090 chip is not used in all exynos5-dt boards, but is used in
> some. For example smdk5250 does not have it, but snow does. So we use
> the device tree to specify the difference, including (on snow) things
> like the tps65090, the display bridge chip, etc.
> 

Hm, it doesn't make sense.
Then it(#define CONFIG_POWER_TPS65090) should go into each config files.
Not in exynos5-dt.h.
Please modify it and patch 6/12 also.

Thanks,
Minkyu Kang.