From: Dan Murphy <dmurphy@ti.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: <robh+dt@kernel.org>, <jacek.anaszewski@gmail.com>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-leds@vger.kernel.org>
Subject: Re: [PATCH v2 1/2] dt: bindings: lm3697: Add bindings for lm3697 driver
Date: Wed, 8 Aug 2018 16:41:16 -0500 [thread overview]
Message-ID: <cdf671fa-674d-6e34-177e-c0e9cb4f6137@ti.com> (raw)
In-Reply-To: <20180808210926.GC15831@amd>
On 08/08/2018 04:09 PM, Pavel Machek wrote:
> On Wed 2018-08-08 16:04:43, Dan Murphy wrote:
>> On 08/08/2018 04:02 PM, Pavel Machek wrote:
>>> Hi!
>>>
>>>>>> + - #size-cells : 0
>>>>>> + - control-bank-cfg - : Indicates which sink is connected to which control bank
>>>>>> + 0 - All HVLED outputs are controlled by bank A
>>>>>> + 1 - HVLED1 is controlled bank B, HVLED2/3 are controlled by bank A
>>>>>> + 2 - HVLED2 is controlled bank B, HVLED1/3 are controlled by bank A
>>>>>> + 3 - HVLED1/2 are controlled by bank B, HVLED3 is controlled by bank A
>>>>>> + 4 - HVLED3 is controlled by bank B, HVLED1/2 are controlled by bank A
>>>>>> + 5 - HVLED1/3 is controlled by bank B, HVLED2 is controlled by bank A
>>>>>> + 6 - (default) HVLED1 is controlled by bank A, HVLED2/3 are controlled by bank B
>>>>>> + 7 - All HVLED outputs are controlled by bank B
>>>>>
>>>>> This is quite long way to describe a bitmask, no? Could we make
>>>>> it so that control-bank-cfg is not needed?
>>>>
>>>> The problem we have here is there is a potential to control
>>>> 3 different LED string but only 2 sinks. So control bank A can control 2 LED strings and control
>>>> bank b can control 1 LED string.
>>>>
>>>
>>> Can we forget about the LED strings, and just expose the sinks as
>>> Linux LED devices?
>>
>> 2 sinks 3 LED strings. How do you know which LED string is which and what bank it belongs
>> to when setting the brightness. Each Bank has a separate register for brightness control.
>
> Yes, and LED strings are statically assigned to banks, right?
>
> So why not simply forget about LED strings for sake of hw
> abstractions, and work just with banks?
How would you set the control bank register for the correct LED string configuration?
Dan
> Pavel
>
--
------------------
Dan Murphy
next prev parent reply other threads:[~2018-08-08 21:41 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-07 16:04 [PATCH v2 1/2] dt: bindings: lm3697: Add bindings for lm3697 driver Dan Murphy
2018-08-07 16:04 ` [PATCH v2 2/2] leds: lm3697: Introduce the " Dan Murphy
2018-08-08 19:59 ` Pavel Machek
2018-08-14 13:54 ` Dan Murphy
2018-08-08 7:56 ` [PATCH v2 1/2] dt: bindings: lm3697: Add bindings for " Michal Vokáč
2018-08-08 9:52 ` Jacek Anaszewski
2018-08-08 19:59 ` Pavel Machek
2018-08-08 20:42 ` Dan Murphy
2018-08-08 21:02 ` Pavel Machek
2018-08-08 21:04 ` Dan Murphy
2018-08-08 21:09 ` Pavel Machek
2018-08-08 21:41 ` Dan Murphy [this message]
2018-08-08 21:45 ` Pavel Machek
2018-08-08 21:50 ` Dan Murphy
2018-08-08 21:58 ` Pavel Machek
2018-08-08 21:09 ` Jacek Anaszewski
2018-08-08 21:45 ` Dan Murphy
2018-08-09 12:09 ` Jacek Anaszewski
2018-08-09 13:24 ` Pavel Machek
2018-08-09 13:30 ` Dan Murphy
2018-08-09 14:48 ` Jacek Anaszewski
2018-08-09 15:01 ` Dan Murphy
2018-08-09 21:59 ` Pavel Machek
2018-08-08 22:00 ` Pavel Machek
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