From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Dan Murphy <dmurphy@ti.com>, robh+dt@kernel.org, pavel@ucw.cz
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-leds@vger.kernel.org
Subject: Re: [PATCH 1/2] dt: bindings: lp5024: Introduce the lp5024 and lp5018 RGB driver
Date: Wed, 9 Jan 2019 21:12:15 +0100 [thread overview]
Message-ID: <df59c10d-7038-cb4a-45f0-7420254c6398@gmail.com> (raw)
In-Reply-To: <366cbf6d-94fa-fea9-be58-07ddb09cff3a@ti.com>
Hi Dan,
On 1/8/19 10:22 PM, Dan Murphy wrote:
> On 1/8/19 3:16 PM, Jacek Anaszewski wrote:
>> On 1/8/19 9:53 PM, Dan Murphy wrote:
>>> Jacek
>>>
>>> On 1/8/19 2:33 PM, Jacek Anaszewski wrote:
>>>> Dan,
>>>>
>>>> On 12/19/18 5:26 PM, Dan Murphy wrote:
>>>>> Introduce the bindings for the Texas Instruments LP5024 and the LP5018
>>>>> RGB LED device driver. The LP5024/18 can control RGB LEDs individually
>>>>> or as part of a control bank group. These devices have the ability
>>>>> to adjust the mixing control for the RGB LEDs to obtain different colors
>>>>> independent of the overall brightness of the LED grouping.
>>>>>
>>>>> Datasheet:
>>>>> http://www.ti.com/lit/ds/symlink/lp5024.pdf
>>>>>
>>>>> Signed-off-by: Dan Murphy <dmurphy@ti.com>
>>>>> ---
>>>>> .../devicetree/bindings/leds/leds-lp5024.txt | 63 +++++++++++++++++++
>>>>> 1 file changed, 63 insertions(+)
>>>>> create mode 100644 Documentation/devicetree/bindings/leds/leds-lp5024.txt
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/leds/leds-lp5024.txt b/Documentation/devicetree/bindings/leds/leds-lp5024.txt
>>>>> new file mode 100644
>>>>> index 000000000000..9567aa6f7813
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/leds/leds-lp5024.txt
>>>>> @@ -0,0 +1,63 @@
>>>>> +* Texas Instruments - LP5024/18 RGB LED driver
>>>>> +
>>>>> +The LM3692x is an ultra-compact, highly efficient,
>>>>> +white-LED driver designed for LCD display backlighting.
>>>>> +
>>>>> +The main difference between the LP5024 and L5018 is the number of
>>>>> +RGB LEDs they support. The LP5024 supports twenty four strings while the
>>>>> +LP5018 supports eighteen strings.
>>>>> +
>>>>> +Required properties:
>>>>> + - compatible:
>>>>> + "ti,lp5018"
>>>>> + "ti,lp5024"
>>>>> + - reg : I2C slave address
>>>>> + - #address-cells : 1
>>>>> + - #size-cells : 0
>>>>> +
>>>>> +Optional properties:
>>>>> + - enable-gpios : gpio pin to enable/disable the device.
>>>>> + - vled-supply : LED supply
>>>>> +
>>>>> +Required child properties:
>>>>> + - reg : Is the child node iteration.
>>>>> + - led-sources : LP5024 - 0 - 7
>>>>> + LP5018 - 0 - 5
>>>>> + Declares the LED string or strings that the child node
>>>>> + will control. If ti,control-bank is set then this
>>>>> + property will contain multiple LED IDs.
>>>>> +
>>>>> +Optional child properties:
>>>>> + - label : see Documentation/devicetree/bindings/leds/common.txt
>>>>> + - linux,default-trigger :
>>>>> + see Documentation/devicetree/bindings/leds/common.txt
>>>>> + - ti,control-bank : Indicates that the LED strings declared in the
>>>>> + led-sources property are grouped within a control
>>>>> + bank for brightness and mixing control.
>>>>> +
>>>>> +Example:
>>>>> +
>>>>> +led-controller@28 {
>>>>> + compatible = "ti,lp5024";
>>>>> + reg = <0x28>;
>>>>> + #address-cells = <1>;
>>>>> + #size-cells = <0>;
>>>>> +
>>>>> + enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
>>>>> + vled-supply = <&vbatt>;
>>>>> +
>>>>> + led@0 {
>>>>> + reg = <0>;
>>>>> + led-sources = <1>;
>>>>> + };
>>>>> +
>>>>> + led@1 {
>>>>> + reg = <1>;
>>>>> + led-sources = <0 6>;
>>>>> + ti,control-bank;
>>>>
>>>> Do you really need ti,control-bank? Doesn't led-sources array size
>>>> greater than 1 mean that the node describes control bank?
>>>>
>>>
>>> That will work too.
>>
>>>> Also, does it make sense to have only two LEDs in the bank?
>>>
>>> The array can populate all 7 LEDs in a single node. I only show 2 here as the example.
>>> See the description above of the led-sources
>>
>> OK, I confused RGB LED modules with banks.
>>
>> Shouldn't we allow for defining either strings or RGB LED
>> triplets somehow then?
>>
>
> Well that is what this should be doing. If you define a single LED in LED sources then
> the triplet is controlled via the associated LEDx_brightness register.
led-sources should map to iouts directly.
So, for RGB LED modules I would expect:
LED0: led-sources = <0 1 2>;
LED1: led-sources = <3 4 5>;
LED2: led-sources = <6 7 8>;
and so on.
for banks:
Bank A with iouts 0,3,6,9: led-sources<0 3 6 9>;
Bank B with iouts 2,4,10: led-sources<2 4 10>;
Bank C with iouts 5,8,11,14,17: led-sources<5 8 11 14 17>;
We could additionally mark banks with ti,control-bank,
but I'm not sure if it would ease parsing, since
you will have to validate iouts configuration anyway.
> If you have multiple LED sources defined in the led-sources then those LEDs would be grouped in the bank.
> I guess I need to provide some protection or a warning if a DT defines two banks because there is only one bank control.
Does the hardware allow the IOUT to belong to an RGB LED module
and to a bank in the same time?
--
Best regards,
Jacek Anaszewski
next prev parent reply other threads:[~2019-01-09 20:12 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-19 16:26 [PATCH 0/2] LP5024/18 LED introduction Dan Murphy
2018-12-19 16:26 ` [PATCH 1/2] dt: bindings: lp5024: Introduce the lp5024 and lp5018 RGB driver Dan Murphy
2018-12-28 23:53 ` Rob Herring
2018-12-31 18:54 ` Dan Murphy
2019-01-08 20:33 ` Jacek Anaszewski
2019-01-08 20:53 ` Dan Murphy
2019-01-08 21:16 ` Jacek Anaszewski
2019-01-08 21:22 ` Dan Murphy
2019-01-09 20:12 ` Jacek Anaszewski [this message]
2019-01-09 21:12 ` Dan Murphy
2019-01-09 21:28 ` Jacek Anaszewski
2019-01-09 21:31 ` Dan Murphy
2019-01-10 18:44 ` Jacek Anaszewski
2019-01-10 19:22 ` Dan Murphy
2019-01-10 19:57 ` Jacek Anaszewski
2019-01-10 20:43 ` Dan Murphy
2019-01-10 22:03 ` Jacek Anaszewski
2019-01-10 23:51 ` Dan Murphy
2019-01-11 12:38 ` Dan Murphy
2019-01-11 21:52 ` Jacek Anaszewski
2019-01-12 17:09 ` Dan Murphy
2019-01-12 19:48 ` Jacek Anaszewski
2019-01-14 12:27 ` Dan Murphy
2019-01-14 20:11 ` Jacek Anaszewski
2019-01-14 20:14 ` Dan Murphy
2019-01-14 20:28 ` Jacek Anaszewski
2019-01-14 20:29 ` Dan Murphy
2018-12-19 16:26 ` [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver Dan Murphy
2018-12-19 19:04 ` Dan Murphy
2018-12-19 19:34 ` Pavel Machek
2018-12-19 19:41 ` Dan Murphy
2018-12-19 20:10 ` Pavel Machek
2018-12-19 20:41 ` Dan Murphy
2018-12-19 21:36 ` Jacek Anaszewski
2018-12-19 21:50 ` Dan Murphy
2018-12-20 12:40 ` Vesa Jääskeläinen
2018-12-20 13:56 ` Dan Murphy
2019-01-01 13:45 ` Vesa Jääskeläinen
2019-01-03 22:05 ` Jacek Anaszewski
2019-01-03 23:19 ` Vesa Jääskeläinen
2019-01-03 23:34 ` Pavel Machek
2019-01-04 19:49 ` Vesa Jääskeläinen
2019-01-04 20:43 ` Pavel Machek
2019-01-04 19:12 ` Jacek Anaszewski
2019-01-04 20:12 ` Pavel Machek
2019-01-04 21:37 ` Jacek Anaszewski
2019-01-04 22:07 ` Pavel Machek
2019-01-05 12:16 ` Jacek Anaszewski
2019-01-05 12:31 ` Pavel Machek
2019-01-05 13:16 ` Jacek Anaszewski
2019-01-05 22:12 ` Generic RGB LED support was " Pavel Machek
2019-01-06 15:52 ` Jacek Anaszewski
2019-01-07 19:13 ` Jacek Anaszewski
2019-01-07 19:36 ` Dan Murphy
2019-01-07 20:59 ` Jacek Anaszewski
2019-01-07 21:14 ` Dan Murphy
2019-01-08 21:18 ` Jacek Anaszewski
2019-01-08 21:25 ` Dan Murphy
2019-01-10 12:46 ` Dan Murphy
2019-01-10 19:23 ` Jacek Anaszewski
2019-01-10 19:58 ` Dan Murphy
2019-01-10 21:02 ` Jacek Anaszewski
2019-01-10 21:07 ` Dan Murphy
2019-01-08 22:59 ` Pavel Machek
2019-01-09 7:11 ` Vesa Jääskeläinen
2019-01-13 16:37 ` Jacek Anaszewski
2019-01-05 0:39 ` Vesa Jääskeläinen
2019-01-07 19:34 ` Dan Murphy
2019-01-09 6:20 ` Vesa Jääskeläinen
2019-01-07 21:13 ` Jacek Anaszewski
2019-01-07 21:15 ` Dan Murphy
2019-01-09 6:46 ` Vesa Jääskeläinen
2019-01-13 16:36 ` Jacek Anaszewski
2018-12-20 20:31 ` Jacek Anaszewski
2018-12-21 7:32 ` Jacek Anaszewski
2018-12-21 13:05 ` Dan Murphy
2018-12-29 18:28 ` Jacek Anaszewski
2018-12-29 19:07 ` Pavel Machek
2018-12-30 17:09 ` Jacek Anaszewski
2018-12-30 17:35 ` Pavel Machek
2018-12-31 15:43 ` Jacek Anaszewski
2018-12-31 15:47 ` Jacek Anaszewski
2018-12-31 19:15 ` Dan Murphy
2019-01-01 14:42 ` Jacek Anaszewski
2019-01-01 18:11 ` Dan Murphy
2019-01-01 22:06 ` Jacek Anaszewski
2018-12-31 16:28 ` Pavel Machek
2019-01-01 14:26 ` Jacek Anaszewski
2018-12-19 22:03 ` Pavel Machek
2018-12-19 22:08 ` Dan Murphy
2018-12-19 22:27 ` Pavel Machek
2018-12-20 1:31 ` Dan Murphy
2018-12-20 9:06 ` Pavel Machek
2018-12-20 14:03 ` Dan Murphy
2019-01-08 21:10 ` Jacek Anaszewski
2019-01-08 21:17 ` Dan Murphy
2019-07-22 20:59 ` Backlight in motorola Droid 4 Pavel Machek
2019-07-23 15:53 ` Dan Murphy
2019-07-24 8:22 ` Pavel Machek
2019-07-24 12:45 ` Pavel Machek
2019-07-24 15:10 ` Dan Murphy
2019-07-24 15:22 ` Dan Murphy
2019-07-26 14:38 ` Dan Murphy
2019-07-29 22:00 ` Pavel Machek
2019-07-30 18:21 ` Dan Murphy
2019-07-30 21:52 ` Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=df59c10d-7038-cb4a-45f0-7420254c6398@gmail.com \
--to=jacek.anaszewski@gmail.com \
--cc=devicetree@vger.kernel.org \
--cc=dmurphy@ti.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-leds@vger.kernel.org \
--cc=pavel@ucw.cz \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).