From: Rob Herring <robh@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Miguel Ojeda <ojeda@kernel.org>, Rob Herring <robh+dt@kernel.org>,
linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mips@vger.kernel.org, Pavel Machek <pavel@ucw.cz>,
Paul Burton <paulburton@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marek Behun <marek.behun@nic.cz>,
devicetree@vger.kernel.org,
Robin van der Gracht <robin@protonic.nl>
Subject: Re: [PATCH v4 02/19] dt-bindings: auxdisplay: ht16k33: Document Adafruit segment displays
Date: Mon, 2 Aug 2021 14:40:01 -0600 [thread overview]
Message-ID: <YQhYIZTlQ/LhjHht@robh.at.kernel.org> (raw)
In-Reply-To: <20210727140459.3767788-3-geert@linux-m68k.org>
On Tue, 27 Jul 2021 16:04:42 +0200, Geert Uytterhoeven wrote:
> The Holtek HT16K33 LED controller is not only used for driving
> dot-matrix displays, but also for driving segment displays.
>
> Document compatible values for the Adafruit 7-segment[1] and
> 14-segment[2] FeatherWing expansion boards with red displays. According
> to the schematics, all other Adafruit 7-segment and 14-segment display
> backpack and FeatherWing expansion boards (including bare boards and
> boards fitted with displays) are compatible with these two boards.
>
> [1] https://www.adafruit.com/product/3108
> [2] https://www.adafruit.com/product/3130
>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
> v4:
> - Combine compatible values for 7/14 segment displays into an enum,
>
> v3:
> - Drop color property,
>
> v2:
> - Fix type of color to uint32,
> - "refresh-rate-hz" is still required for dot-matrix displays.
>
> Alternatives I considered:
> 1. Document the attached display type in a child node.
> I.e. specify segment type, number of characters, and wiring.
> Especially the latter would become really complex, due to the sheer
> amount of possible wiring combinations.
> Using this method, you also loose the ability to just connect a
> display to an i2c bus, and instantiate the device from sysfs,
> without using DT:
>
> echo adafruit,3130 0x70 > /sys/class/i2c/i2c-adapter/.../new_device
>
> 2. Document all Adafruit 7-segment and 14-segment display backpack and
> FeatherWing expansion boards.
> This would lead to a myriad of compatible values:
>
> - items:
> - enum:
> - adafruit,878 # 0.56" 4-Digit 7-Segment Display Backpack (Red)
> - adafruit,879 # 0.56" 4-Digit 7-Segment Display Backpack (Yellow)
> - adafruit,880 # 0.56" 4-Digit 7-Segment Display Backpack (Green)
> - adafruit,881 # 0.56" 4-Digit 7-Segment Display Backpack (Blue)
> - adafruit,1002 # 0.56" 4-Digit 7-Segment Display Backpack (White)
> - const: adafruit,877 # 0.56" 4-Digit 7-Segment Backpack
> - const: holtek,ht16k33
>
> - items:
> - enum:
> - adafruit,1268 # 1.2" 4-Digit 7-Segment Display Backpack (Green)
> - adafruit,1269 # 1.2" 4-Digit 7-Segment Display Backpack (Yellow)
> - adafruit,1270 # 1.2" 4-Digit 7-Segment Display Backpack (Red)
> - const: adafruit,1271 # 1.2" 4-Digit 7-Segment Backpack
> - const: holtek,ht16k33
>
> - items:
> - enum:
> - adafruit,1911 # 0.54" Quad Alphanumeric Display Backpack (Red)
> - adafruit,1912 # 0.54" Quad Alphanumeric Display Backpack (Blue)
> - adafruit,2157 # 0.54" Quad Alphanumeric Display Backpack (White)
> - adafruit,2158 # 0.54" Quad Alphanumeric Display Backpack (Yellow)
> - adafruit,2159 # 0.54" Quad Alphanumeric Display Backpack (Yellow-Green)
> - adafruit,2160 # 0.54" Quad Alphanumeric Display Backpack (Green)
> - const: adafruit,1910 # 0.54" Quad 14-segment Alphanumeric Backpack
> - const: holtek,ht16k33
>
> - items:
> - enum:
> - adafruit,3106 # 0.56" 4-Digit 7-Segment FeatherWing Display (Blue)
> - adafruit,3107 # 0.56" 4-Digit 7-Segment FeatherWing Display (Green)
> - adafruit,3108 # 0.56" 4-Digit 7-Segment FeatherWing Display (Red)
> - adafruit,3109 # 0.56" 4-Digit 7-Segment FeatherWing Display (White)
> - adafruit,3110 # 0.56" 4-Digit 7-Segment FeatherWing Display (Yellow)
> - const: adafruit,3088 # 0.56" 4-Digit 7-Segment FeatherWing
> - const: holtek,ht16k33
>
> - items:
> - enum:
> - adafruit,3127 # 0.54" Quad Alphanumeric FeatherWing Display (White)
> - adafruit,3128 # 0.54" Quad Alphanumeric FeatherWing Display (Blue)
> - adafruit,3129 # 0.54" Quad Alphanumeric FeatherWing Display (Green)
> - adafruit,3130 # 0.54" Quad Alphanumeric FeatherWing Display (Red)
> - adafruit,3131 # 0.54" Quad Alphanumeric FeatherWing Display (Yellow)
> - adafruit,3132 # 0.54" Quad Alphanumeric FeatherWing Display (Yellow-Green)
> - const: adafruit,3089 # 0.54" Quad 14-segment Alphanumeric FeatherWing
> - const: holtek,ht16k33
> ---
> .../bindings/auxdisplay/holtek,ht16k33.yaml | 20 ++++++++++++++++---
> 1 file changed, 17 insertions(+), 3 deletions(-)
>
Reviewed-by: Rob Herring <robh@kernel.org>
next prev parent reply other threads:[~2021-08-02 20:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 14:04 [PATCH v4 00/19] auxdisplay: ht16k33: Add character display support Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 01/19] uapi: Add <linux/map_to_14segment.h> Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 02/19] dt-bindings: auxdisplay: ht16k33: Document Adafruit segment displays Geert Uytterhoeven
2021-08-02 20:40 ` Rob Herring [this message]
2021-07-27 14:04 ` [PATCH v4 03/19] auxdisplay: img-ascii-lcd: Fix lock-up when displaying empty string Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 04/19] auxdisplay: img-ascii-lcd: Add helper variable dev Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 05/19] auxdisplay: img-ascii-lcd: Convert device attribute to sysfs_emit() Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 06/19] auxdisplay: Extract character line display core support Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 07/19] auxdisplay: linedisp: Use kmemdup_nul() helper Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 08/19] auxdisplay: linedisp: Add support for changing scroll rate Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 09/19] auxdisplay: ht16k33: Connect backlight to fbdev Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 10/19] auxdisplay: ht16k33: Use HT16K33_FB_SIZE in ht16k33_initialize() Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 11/19] auxdisplay: ht16k33: Remove unneeded error check in keypad probe() Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 12/19] auxdisplay: ht16k33: Convert to simple i2c probe function Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 13/19] auxdisplay: ht16k33: Add helper variable dev Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 14/19] auxdisplay: ht16k33: Move delayed work Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 15/19] auxdisplay: ht16k33: Extract ht16k33_brightness_set() Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 16/19] auxdisplay: ht16k33: Extract frame buffer probing Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 17/19] auxdisplay: ht16k33: Add support for segment displays Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 18/19] dt-bindings: auxdisplay: ht16k33: Document LED subnode Geert Uytterhoeven
2021-07-27 14:04 ` [PATCH v4 19/19] auxdisplay: ht16k33: Add LED support Geert Uytterhoeven
2021-07-27 21:05 ` Randy Dunlap
2021-07-28 7:39 ` Geert Uytterhoeven
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