From patchwork Wed Apr 28 07:32:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksij Rempel X-Patchwork-Id: 428711 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C790C433ED for ; Wed, 28 Apr 2021 07:32:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 579B9613F3 for ; Wed, 28 Apr 2021 07:32:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236800AbhD1HdE (ORCPT ); Wed, 28 Apr 2021 03:33:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230317AbhD1HdD (ORCPT ); Wed, 28 Apr 2021 03:33:03 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61FDFC06175F for ; Wed, 28 Apr 2021 00:32:19 -0700 (PDT) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lbeg7-00034I-1k; Wed, 28 Apr 2021 09:32:11 +0200 Received: from ore by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1lbeg5-00056Y-BV; Wed, 28 Apr 2021 09:32:09 +0200 From: Oleksij Rempel To: Rob Herring , Jonathan Cameron Cc: Oleksij Rempel , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Pengutronix Kernel Team , David Jander , Robin van der Gracht , linux-iio@vger.kernel.org, Lars-Peter Clausen , Peter Meerwald-Stadler , Dmitry Torokhov Subject: [PATCH v6 0/3] mainline ti tsc2046 adc driver Date: Wed, 28 Apr 2021 09:32:05 +0200 Message-Id: <20210428073208.19570-1-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: devicetree@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org changes v6: - get blessing from Dmitry Torokhov - rebase against latest iio/testing - use simple name for iio_dev->name - use Jonathan's version for oversampling-ratio description changes v5: - remove type for the settling-time-us property changes v4: - spell fixes - add more comments - make code more readable - move scan_buf to the priv - use FIELD_GET to extract ADC data - make some multi line code as one line - do not use atomic API for trig_more_count - fix build warning on 64bit system - add NULL check for the devm_kasprintf() - use return devm_iio_device_register(), without additional error printing. changes v3: - different spell fixes - add some notes about driver structure - rename the trigger to point on the touchscreen nature of it - rename DT binding to oversampling-ratio - make sure we have some defaults in case no DT property is set changes v2: - rework and extend DT binding properties - remove touchscreen related code from the IIO ADC driver - make trigger be active longer then IRQ is requesting. This is needed to get "inactive" samples - make oversampling and settle time configurable TI TSC2046 is a touchscreen controller based on 8 channel ADC. Since most of this ADC based touchscreen controller share same set of challenges, it is better keep then as simple IIO ADC devices attached to a generic resistive-adc-touch driver. This driver can replace drivers/input/touchscreen/ads7846.c and has following advantages over it: - less code to maintain - shared code paths (resistive-adc-touch, iio-hwmon, etc) - can be used as plain IIO ADC to investigate signaling issues or test real capacity of the plates and attached low-pass filters (or use the touchscreen as a microphone if you like ;) ) Oleksij Rempel (3): dt-bindings:iio:adc: add generic settling-time-us and oversampling-ratio channel properties dt-bindings:iio:adc: add documentation for TI TSC2046 controller iio: adc: add ADC driver for the TI TSC2046 controller .../devicetree/bindings/iio/adc/adc.yaml | 12 + .../bindings/iio/adc/ti,tsc2046.yaml | 115 +++ MAINTAINERS | 8 + drivers/iio/adc/Kconfig | 12 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-tsc2046.c | 720 ++++++++++++++++++ 6 files changed, 868 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,tsc2046.yaml create mode 100644 drivers/iio/adc/ti-tsc2046.c Reviewed-by: Rob Herring