From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754155AbdBFOlO (ORCPT ); Mon, 6 Feb 2017 09:41:14 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:55404 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751517AbdBFOiK (ORCPT ); Mon, 6 Feb 2017 09:38:10 -0500 From: Geert Uytterhoeven To: Miguel Ojeda Sandonis , Greg Kroah-Hartman , Willy Tarreau , Ksenija Stanojevic , Arnd Bergmann Cc: linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 00/13] Add HD44780 Character LCD support Date: Mon, 6 Feb 2017 15:38:02 +0100 Message-Id: <1486391895-9554-1-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, Character LCDs are currently typically driven from userspace, either directly through bit-banging, or via some kind of serial (UART/i2c) interface. This patch series adds kernel support for character LCDs using an Hitachi HD44780 Character LCD Controller where its M6800 bus interface is connected to GPIOs. It does so after extracting the character LCD core support from the existing Parallel port LCD/Keypad Panel driver into its own subdriver. - Patch 1 fixes a bug in the existing panel driver, - Patches 2-8 perform clean ups and improvements to the panel driver, - Patch 9 extract the character LCD core support from the panel driver into an auxdisplay charlcd subdriver, - Patches 10-11 add new features to the character LCD core driver (4-bit interface support and support for displays with more than 2 lines), - Patch 12 adds DT bindings for describing HD44780 Character LCDs, - Patch 13 adds a driver for HD44780 Character LCDs connected to GPIOs, using the new character LCD core. Note that Linux has other support for HD44780 Character LCDs, but none of it is generic: - drivers/misc/arm-charlcd.c involves a custom IP block for interfacing to the LCD controller, - drivers/parisc/led.c is tightly coupled to LED handling on various HP PA-RISC machines. This has been tested using a 20x4 character LCD with backlight, using both 8-bit and 4-bit wiring to one or two 74HC595 shift registers connected to an SPI master controller. Regression testing on original "panel" hardware would be appreciated. Thanks for your comments! Geert Uytterhoeven (13): misc: panel: Fix LCD_FLAG_F/LCD_FLAG_N exchange misc: panel: Remove PANEL_VERSION misc: panel: Remove unused LCD_FLAG_S and LCD_FLAG_ID misc: panel: Remove reference to misc device support misc: panel: Move all suboptions into a big if section misc: panel: Remove always-true check from panel_detach() misc: panel: Add lcd_home() helper misc: panel: Abstract temporary backlight handling auxdisplay: charlcd: Extract character LCD core from misc/panel auxdisplay: charlcd: Add support for 4-bit interfaces auxdisplay: charlcd: Add support for displays with more than two lines dt-bindings: auxdisplay: Add bindings for Hitachi HD44780 auxdisplay: Add HD44780 Character LCD support .../devicetree/bindings/auxdisplay/hit,hd44780.txt | 44 ++ drivers/auxdisplay/Kconfig | 14 + drivers/auxdisplay/Makefile | 2 + drivers/auxdisplay/charlcd.c | 818 ++++++++++++++++++++ drivers/auxdisplay/hd44780.c | 326 ++++++++ drivers/misc/Kconfig | 45 +- drivers/misc/panel.c | 852 +++------------------ include/misc/charlcd.h | 42 + 8 files changed, 1374 insertions(+), 769 deletions(-) create mode 100644 Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt create mode 100644 drivers/auxdisplay/charlcd.c create mode 100644 drivers/auxdisplay/hd44780.c create mode 100644 include/misc/charlcd.h -- 1.9.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds