From patchwork Mon Apr 30 10:32:10 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 10371397 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A458A60234 for ; Mon, 30 Apr 2018 10:37:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9421B28A73 for ; Mon, 30 Apr 2018 10:37:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 86C672876C; Mon, 30 Apr 2018 10:37:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 053862876C for ; Mon, 30 Apr 2018 10:37:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753425AbeD3KfK (ORCPT ); Mon, 30 Apr 2018 06:35:10 -0400 Received: from esa1.microchip.iphmx.com ([68.232.147.91]:16509 "EHLO esa1.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751361AbeD3KfI (ORCPT ); Mon, 30 Apr 2018 06:35:08 -0400 X-IronPort-AV: E=Sophos;i="5.49,346,1520924400"; d="scan'208";a="14346513" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 30 Apr 2018 03:35:08 -0700 Received: from eh-station.mchp-main.com (10.10.76.4) by chn-sv-exch05.mchp-main.com (10.10.76.106) with Microsoft SMTP Server id 14.3.352.0; Mon, 30 Apr 2018 03:35:07 -0700 From: Eugen Hristev To: , , , , , , , , , , CC: Eugen Hristev Subject: [PATCH v4 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings Date: Mon, 30 Apr 2018 13:32:10 +0300 Message-ID: <1525084335-11276-5-git-send-email-eugen.hristev@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1525084335-11276-1-git-send-email-eugen.hristev@microchip.com> References: <1525084335-11276-1-git-send-email-eugen.hristev@microchip.com> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Added bindings for generic resistive touchscreen ADC. Signed-off-by: Eugen Hristev Reviewed-by: Rob Herring --- Changes in v3: - renamed file and compatible to exclude "generic" keyword - removed the pressure threshold property, added it as a common touchscreen property in the touchscreen common bindings in a separate commit. Changes in v2: - modified bindings to have a generic resistive touchscreen adc driver instead of specific architecture one. .../input/touchscreen/resistive-adc-touch.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt new file mode 100644 index 0000000..1c4e4a8 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt @@ -0,0 +1,30 @@ +Generic resistive touchscreen ADC + +Required properties: + + - compatible: must be "resistive-adc-touch" +The device must be connected to an ADC device that provides channels for +position measurement and optional pressure. +Refer to ../iio/iio-bindings.txt for details + - iio-channels: must have at least two channels connected to an ADC device. +These should correspond to the channels exposed by the ADC device and should +have the right index as the ADC device registers them. These channels +represent the relative position on the "x" and "y" axes. + - iio-channel-names: must have all the channels' names. Mandatory channels +are "x" and "y". + +Optional properties: + - iio-channels: The third channel named "pressure" is optional and can be +used if the ADC device also measures pressure besides position. +If this channel is missing, pressure will be ignored and the touchscreen +will only report position. + - iio-channel-names: optional channel named "pressure". + +Example: + + resistive_touch: resistive_touch { + compatible = "resistive-adc-touch"; + touchscreen-threshold-pressure = <50000>; + io-channels = <&adc 24>, <&adc 25>, <&adc 26>; + io-channel-names = "x", "y", "pressure"; + };