linux-kernel - [PATCH 0/2] auxdisplay: HD44780 connected to I2C via PCF8574

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Message-ID: <20210105150124.dvlochv3qrp4wpre@runtux.com>
Date:   Tue, 5 Jan 2021 16:01:24 +0100
From:   Ralf Schlatterbeck <rsc@...tux.com>
To:     Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] auxdisplay: HD44780 connected to I2C via PCF8574

Character LCD driver for the Hitachi HD44780 with I2C connection:
There already is a driver for displays with parallel gpio connections.
Re-uses the high-level API.

Concerning the compatible-string: I'm currently using

"hit,hd44780+nxp,pcf8575"

- "hit,hd44780" is used for the parallel-connected version of the display
- nxp,pcf8575 already exists in drivers/gpio/gpio-pcf857x.c which uses
  the same chip for gpio expansion.

Let me know if this choice of names is fine or should be changed.
For the other device-tree names I'm reusing (some of) the names from the
parallel connected display.

 .../auxdisplay/hit,hd44780+nxp,pcf8575.yaml (new)  |  65 +++++++
 drivers/auxdisplay/Kconfig                         |  14 +-
 drivers/auxdisplay/Makefile                        |   1 +
 drivers/auxdisplay/hd44780-pcf8574.c (new)         | 207 +++++++++++++++++++++
 4 files changed, 286 insertions(+), 1 deletion(-)

-- 
Ralf Schlatterbeck                      Tel:   +43/2243/26465-16
Open Source Consulting                  www:   www.runtux.com
Reichergasse 131, A-3411 Weidling       email: office@...tux.com