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Date: Sat, 27 Jan 2024 00:21:48 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Lee Jones <lee@kernel.org>
Cc: Martin Kurbanov <mmkurbanov@salutedevices.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org,
	devicetree@vger.kernel.org, linux-doc@vger.kernel.org,
	kernel@salutedevices.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v1 1/2] leds: aw200xx: support for hw pattern controllers
Message-ID: <ZbQ-jKD_zhonHOCa@ucw.cz>
References: <20231207125938.175119-1-mmkurbanov@salutedevices.com>
 <20231207125938.175119-2-mmkurbanov@salutedevices.com>
 <20231221161011.GO10102@google.com>
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In-Reply-To: <20231221161011.GO10102@google.com>

Hi!

> > This led-controller supports 3 pattern controllers for auto breathing or
> > group dimming control. Each pattern controller can work in auto
> > breathing or manual control mode. All breathing parameters including
> > rising/falling slope, on/off time, repeat times, min/max brightness
> > and so on are configurable.
> > 
> > Signed-off-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
> > ---
> >  .../testing/sysfs-class-led-driver-aw200xx    | 108 +++
> >  Documentation/leds/leds-aw200xx.rst           | 274 ++++++++
> >  drivers/leds/leds-aw200xx.c                   | 649 ++++++++++++++++++
> >  3 files changed, 1031 insertions(+)
> >  create mode 100644 Documentation/leds/leds-aw200xx.rst
> 
> This interface is bananas.  Exposing an entire register interface to
> sysfs does not sit will with me at all.  When we add support to a sysfs
> class, we usually require it to be generic and work across all devices.
> Adding device specific interfaces is generally decried and to be
> avoided.  Don't forget, once we commit something to sysfs, it becomes
> ABI and we have to support it forever.

If you do git grep hw_pattern, you should get pointers to qcom-lpg
driver that solves similar problem, with interface that should be
acceptable.

Best regards,
								Pavel