From: Rob Herring <robh@kernel.org>
To: Akinobu Mita <akinobu.mita@gmail.com>
Cc: linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
Bjorn Andersson <bjorn@kryo.se>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Jean-Jacques Hiblot <jjhiblot@ti.com>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: leds: Add leds-meter binding
Date: Wed, 30 Oct 2019 09:24:17 -0500 [thread overview]
Message-ID: <20191030142417.GA8919@bogus> (raw)
In-Reply-To: <1572185379-21537-2-git-send-email-akinobu.mita@gmail.com>
On Sun, Oct 27, 2019 at 11:09:38PM +0900, Akinobu Mita wrote:
> Add DT binding for generic LED level meter which consists of multiple LED
> devices by different drivers.
Do you have some pointers to actual h/w?
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Bjorn Andersson <bjorn@kryo.se>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Jean-Jacques Hiblot <jjhiblot@ti.com>
> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Dan Murphy <dmurphy@ti.com>
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> ---
> .../devicetree/bindings/leds/leds-meter.yaml | 67 ++++++++++++++++++++++
> 1 file changed, 67 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/leds/leds-meter.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-meter.yaml b/Documentation/devicetree/bindings/leds/leds-meter.yaml
> new file mode 100644
> index 0000000..b5fcd98
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-meter.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-meter.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic LED level meter
> +
> +maintainers:
> + - Akinobu Mita <akinobu.mita@gmail.com>
> +
> +description:
> + Generic LED level meter consists of multiple LED devices by different drivers.
Googling this, the only thing I see is audio level meters though those
are all just a voltage level input, so it could be any source I guess.
> +
> +properties:
> + $nodename:
> + pattern: "^meter-leds(@.*)?"
> +
> + compatible:
> + const: meter-leds
> +
> + leds:
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/phandle-array
> + description: List of phandles to LED node that are members of a level meter.
> +
> + brightness-weights:
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32-array
> + description: |
> + By default, the brightness of the LED level meter is proportional to the
> + number of actual LEDs that are turned on. We can optionally specify
> + the contribution ratio for each LED within a level meter by this
> + property. The example below shows how to setup an exponential
> + relationship between the number of LEDs turned on and the brightness of
> + meter-leds.
This seems oddly named if this is a bar graph. Yes, more LEDs on is
brighter, but it's really a piecewise linear graph you want.
Each LED could have variable brightness, so you could also ramp the
brightness for an individual LED.
Rob
next prev parent reply other threads:[~2019-10-30 14:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-27 14:09 [PATCH v2 0/2] leds: introduce generic LED level meter driver Akinobu Mita
2019-10-27 14:09 ` [PATCH v2 1/2] dt-bindings: leds: Add leds-meter binding Akinobu Mita
2019-10-29 12:05 ` Dan Murphy
2019-10-30 15:08 ` Akinobu Mita
2019-10-30 14:24 ` Rob Herring [this message]
2019-10-30 15:27 ` Akinobu Mita
2019-10-30 18:29 ` Rob Herring
2019-10-31 15:05 ` Akinobu Mita
2019-10-27 14:09 ` [PATCH v2 2/2] leds: Add generic LED level meter driver Akinobu Mita
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