[U-Boot] [PATCH 4/5] exynos5420: Add LCD and LED powerup settings for peach-pi

[Simon Glass]

Hi Ajay,

On 7 December 2014 at 23:45, Ajay kumar <ajaynumb at gmail.com> wrote:
> Hi,
>
> On Fri, Dec 5, 2014 at 10:12 PM, Simon Glass <sjg at google.com> wrote:
>> Hi,
>>
>> On 5 December 2014 at 08:42, Sjoerd Simons
>> <sjoerd.simons at collabora.co.uk> wrote:
>>> On Fri, 2014-12-05 at 19:43 +0530, Ajay Kumar wrote:
>>>> Add code to support powerup sequence for peach-pi LCD.
>>>>
>>>> Signed-off-by: Ajay Kumar <ajaykumar.rs at samsung.com>
>>>> ---
>>>>  board/samsung/smdk5420/smdk5420.c |   32 +++++++++++++++++++++-----------
>>>>  1 file changed, 21 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git a/board/samsung/smdk5420/smdk5420.c b/board/samsung/smdk5420/smdk5420.c
>>>> index a691222..915125e 100644
>>>> --- a/board/samsung/smdk5420/smdk5420.c
>>>> +++ b/board/samsung/smdk5420/smdk5420.c
>>>> @@ -73,19 +73,24 @@ void exynos_lcd_power_on(void)
>>>>
>>>>       mdelay(5);
>>>>
>>>> -     /* TODO(ajaykumar.rs at samsung.com): Use device tree */
>>>> -     gpio_request(EXYNOS5420_GPIO_X35, "edp_slp#");
>>>> -     gpio_direction_output(EXYNOS5420_GPIO_X35, 1);  /* EDP_SLP# */
>>>> -     mdelay(10);
>>>> -     gpio_request(EXYNOS5420_GPIO_Y77, "edp_rst#");
>>>> -     gpio_direction_output(EXYNOS5420_GPIO_Y77, 1);  /* EDP_RST# */
>>>> -     gpio_request(EXYNOS5420_GPIO_X26, "edp_hpd");
>>>> -     gpio_direction_input(EXYNOS5420_GPIO_X26);      /* EDP_HPD */
>>>> -     gpio_set_pull(EXYNOS5420_GPIO_X26, S5P_GPIO_PULL_NONE);
>>>> -
>>>> -     if (has_edp_bridge())
>>>> +     if (has_edp_bridge()) {
>>>> +             /* TODO(ajaykumar.rs at samsung.com): Use device tree */
>>>> +             gpio_request(EXYNOS5420_GPIO_X35, "edp_slp#");
>>>> +             gpio_direction_output(EXYNOS5420_GPIO_X35, 1);  /* EDP_SLP# */
>>>> +             mdelay(10);
>>>> +             gpio_request(EXYNOS5420_GPIO_Y77, "edp_rst#");
>>>> +             gpio_direction_output(EXYNOS5420_GPIO_Y77, 1);  /* EDP_RST# */
>>>> +             gpio_request(EXYNOS5420_GPIO_X26, "edp_hpd");
>>>> +             gpio_direction_input(EXYNOS5420_GPIO_X26);      /* EDP_HPD */
>>>> +             gpio_set_pull(EXYNOS5420_GPIO_X26, S5P_GPIO_PULL_NONE);
>>>> +
>>>>               if (parade_init(gd->fdt_blob))
>>>>                       printf("%s: ps8625_init() failed\n", __func__);
>>>> +     } else {
>>>> +             gpio_request(EXYNOS5420_GPIO_X26, "edp_hpd");
>>>> +             gpio_direction_input(EXYNOS5420_GPIO_X26);      /* EDP_HPD */
>>>> +             gpio_set_pull(EXYNOS5420_GPIO_X26, S5P_GPIO_PULL_NONE);
>>>> +     }
>>>
>>> Any chance you could switch to using device-tree while changing this
>>> area. On SMDK5420 and XU3 EXYNOS5420_GPIO_X26 is used for USB so there
>>> is a bit of a potentially nastly clash there.
>>
>> Yes we should really do that.
> I am trying to consolidate what all needs to be done for Exynos5250
> and Exynos5420,
> in order to remove LCD routines from the board files.
> Here are my observations:
> 1) A separate driver for ptn3460 should be created.
> 2) Need a place holder for tps65090 FET settings.
> 3) I am planning to move all the LCD_EN/BACKLIGHT_EN GPIOs
>     to the "weak function definitions" in exynos_fb.c.
>     In that case, we have a limitation. All boards under a specific
> SOC should conform
>     to use only device tree or use only define board level LCD routines.
>     ex: smdk5250 and snow - both need to use device tree to specify LCD details,
>          or both need to define LCD powerup routines. It cannot be
> like snow uses device tree,
>          and smdk5250 defines LCD routines in smdk5250 board file.

Do any boards exist which don't use device tree? I think we can drop
that old support.

For a recent Tegra series I used the kernel device tree binding and
just picked out information about the regulators. It might be possible
to do the same on Exynos. See for example get_backlight_info() in this
patch: http://patchwork.ozlabs.org/patch/416675/

Regards,
Simon