From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Murphy Subject: Re: [PATCH v2 1/2] dt: bindings: lm3697: Add bindings for lm3697 driver Date: Wed, 8 Aug 2018 16:45:06 -0500 Message-ID: <01bbf05a-8e5e-d3ce-857a-ac5c6efb779c@ti.com> References: <20180807160442.8937-1-dmurphy@ti.com> <20180808195903.GB20912@amd> <20180808210215.GA15831@amd> <53691469-4554-42a8-c182-762c1a3939b7@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <53691469-4554-42a8-c182-762c1a3939b7@gmail.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Jacek Anaszewski , Pavel Machek Cc: robh+dt@kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org List-Id: devicetree@vger.kernel.org Jacek On 08/08/2018 04:09 PM, Jacek Anaszewski wrote: > Hi Dan, > > On 08/08/2018 11:04 PM, 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. > > Just a blind shot, without going into details - could you please check > if led-sources property documented in the common LED bindings couldn't > help here? > I could change the name to led-sources. But this part does not really follow the 1 output to a 1 LED string topology. -- ------------------ Dan Murphy