From: Rob Herring <robh@kernel.org>
To: Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>
Cc: Jyri Sarha <jsarha-l0cyMroinI0@public.gmane.org>,
"linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Bartlomiej Zolnierkiewicz
<b.zolnierkie-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
Benoit Cousson <bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH v2 4/5] fbdev/ssd1307fb: add support to enable VBAT
Date: Thu, 19 Jan 2017 16:22:54 +0000 [thread overview]
Message-ID: <CAL_JsqLnuni0UVy9bDY9Jw6knVozdNT68gFYYfPwqoT-8h2vQw@mail.gmail.com> (raw)
In-Reply-To: <c0372d48-b538-64ce-f187-0502a9a4a00e-l0cyMroinI0@public.gmane.org>
On Thu, Jan 19, 2017 at 9:08 AM, Tomi Valkeinen <tomi.valkeinen@ti.com> wrote:
> On 19/01/17 17:03, Rob Herring wrote:
>
>>>> According to the datasheet, SSD1307 has 2 supplies: Vdd and Vcc
>>>>
>>>> I don't see any mention of a charge pump, so that must be an external
>>>> component.
>>>
>>> VBAT is for SSD1306. Perhaps the DT doc should mention it.
>>
>> Datasheet says VBAT is reserved, connect to Vdd. I would just describe
>> Vdd and Vcc in that case.
>
> I'm no HW guy, but as far as I understand, you can wire it up two ways.
> One has VBAT connected to VDD. The other one has VBAT connected to
> external supply. See "Figure 1 : Application Example of SSD1306Z with
> charge bump".
I should have kept reading...
So either Vdd and Vbat supplies or Vdd and Vcc supplies are valid and
the former only applies to 1306.
Rob
next prev parent reply other threads:[~2017-01-19 16:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20170113103601epcas4p38f03c4eb4147ff5a08e93af2cda635ba@epcas4p3.samsung.com>
2017-01-13 10:35 ` [PATCH v2 0/5] fbdev/ssd1307fb: Some changes and improvement Jyri Sarha
[not found] ` <cover.1484303628.git.jsarha-l0cyMroinI0@public.gmane.org>
2017-01-13 10:35 ` [PATCH v2 1/5] fbdev: ssd1307fb: Start to use gpiod API for reset gpio Jyri Sarha
2017-01-13 10:35 ` [PATCH v2 2/5] fbdev: ssd1307fb: Remove reset-active-low from the DT binding document Jyri Sarha
[not found] ` <b68e1b9b735543b9e1511cfeb8e5d9ceec6c7666.1484303628.git.jsarha-l0cyMroinI0@public.gmane.org>
2017-01-18 22:28 ` Rob Herring
2017-01-19 8:24 ` Jyri Sarha
2017-01-13 10:35 ` [PATCH v2 3/5] fbdev: ssd1307fb: Make reset gpio devicetree property optional Jyri Sarha
2017-01-13 10:35 ` [PATCH v2 4/5] fbdev/ssd1307fb: add support to enable VBAT Jyri Sarha
[not found] ` <214ae9ca86009148f233be71a3606917f3150dcd.1484303628.git.jsarha-l0cyMroinI0@public.gmane.org>
2017-01-18 22:33 ` Rob Herring
2017-01-19 13:15 ` Tomi Valkeinen
[not found] ` <754f3644-a157-bb90-1494-aba4fc1264f8-l0cyMroinI0@public.gmane.org>
2017-01-19 15:03 ` Rob Herring
[not found] ` <CAL_JsqLjTa2SWP_cNU9AV4tRZLDcjJsUV7pUvy=4UhQix7ZjQQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-01-19 15:08 ` Tomi Valkeinen
[not found] ` <c0372d48-b538-64ce-f187-0502a9a4a00e-l0cyMroinI0@public.gmane.org>
2017-01-19 16:22 ` Rob Herring [this message]
2017-01-13 10:35 ` [PATCH v2 5/5] fbdev/ssd1307fb: clear screen in probe Jyri Sarha
2017-02-08 15:15 ` [PATCH v2 0/5] fbdev/ssd1307fb: Some changes and improvement Bartlomiej Zolnierkiewicz
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