From patchwork Mon May 21 10:27:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 917529 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=microchip.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40qFXQ3Vccz9s37 for ; Mon, 21 May 2018 20:35:02 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752859AbeEUKdd (ORCPT ); Mon, 21 May 2018 06:33:33 -0400 Received: from esa3.microchip.iphmx.com ([68.232.153.233]:33528 "EHLO esa3.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751181AbeEUKd3 (ORCPT ); Mon, 21 May 2018 06:33:29 -0400 X-IronPort-AV: E=Sophos;i="5.49,426,1520924400"; d="scan'208";a="14487301" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa3.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 21 May 2018 03:33:29 -0700 Received: from eh-station.mchp-main.com (10.10.76.4) by chn-sv-exch06.mchp-main.com (10.10.76.107) with Microsoft SMTP Server id 14.3.352.0; Mon, 21 May 2018 03:33:28 -0700 From: Eugen Hristev To: , , , , , , , , , , CC: Eugen Hristev Subject: [PATCH v6 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings Date: Mon, 21 May 2018 13:27:52 +0300 Message-ID: <1526898477-9952-5-git-send-email-eugen.hristev@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1526898477-9952-1-git-send-email-eugen.hristev@microchip.com> References: <1526898477-9952-1-git-send-email-eugen.hristev@microchip.com> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Added bindings for generic resistive touchscreen ADC. Signed-off-by: Eugen Hristev Reviewed-by: Rob Herring --- Changes in v5: - changed property name touchscreen-threshold-pressure to touchscreen-min-pressure 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..51456c0 --- /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-min-pressure = <50000>; + io-channels = <&adc 24>, <&adc 25>, <&adc 26>; + io-channel-names = "x", "y", "pressure"; + };