linux-kernel - Re: [RESEND PATCH v6 2/3] leds: Add driver for the TLC5925 LED controller

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Message-ID: <5ba34982-52c7-e41a-fba8-d88d93529e47@traphandler.com>
Date:   Thu, 4 Aug 2022 22:23:00 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v6 2/3] leds: Add driver for the TLC5925 LED
 controller

On 31/07/2022 21:28, Andy Shevchenko wrote:
> On Fri, Jul 22, 2022 at 10:14 AM Jean-Jacques Hiblot
> <jjhiblot@...phandler.com> wrote:
>> The TLC5925 is a 16-channels constant-current LED sink driver.
>> It is controlled via SPI but doesn't offer a register-based interface.
>> Instead it contains a shift register and latches that convert the
>> serial input into a parallel output.
>>
>> Datasheet: https://www.ti.com/lit/ds/symlink/tlc5925.pdf
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
>> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Sorry for my slowpokeness, but I just realized that this driver may
> not be needed. What is the difference to existing gpio-74x164?

It might work. However it might not be as practical and efficient as the 
dedicated LED driver.

I'll give a try.

JJ