From patchwork Tue May 22 07:52:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 10417487 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 B3BFF60224 for ; Tue, 22 May 2018 07:57:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A61E628B16 for ; Tue, 22 May 2018 07:57:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 99FD128B62; Tue, 22 May 2018 07:57:49 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0A4D928B16 for ; Tue, 22 May 2018 07:57:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fdYp6bF3Mnwr8G6A1HbLhSNCGPlz2OOuWk4vM2KKrtI=; b=Svvg9eV1UY7UXh 84rkZmNgc+JGQE+Ek7yMwRnAOv6OUE4aka3F/c5WClFV1D55CBagAGzWEvix2eGrptVUhV+ffMZ7t +vpwo0t4ZxSAIpAOzVewZMpAvWcyQfyB4PgKsWzuuJF5HhJzJYabtL3Lujy1eMGGdiLtq1u5EAFnk wap5W/m6JO8IYZJLZBI2vtfoCXjWbYkOdXqof0Xx8+sbWUYaejSrB2zx/xddeRzwWzxMBUeXVmgRP 0xQTt21Zh1eACyJKwAmYAXHHEj3HLVCpWXw1o9bKMa11/uHvf9AvpdIwonq/24m1e3K+eyh9qt48k xNZJv6KhEkFh6EpLyxtw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fL2As-00035x-ER; Tue, 22 May 2018 07:57:38 +0000 Received: from esa2.microchip.iphmx.com ([68.232.149.84]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fL29A-00028m-AZ for linux-arm-kernel@lists.infradead.org; Tue, 22 May 2018 07:56:00 +0000 X-IronPort-AV: E=Sophos;i="5.49,429,1520924400"; d="scan'208";a="14433787" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa2.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 22 May 2018 00:55:41 -0700 Received: from eh-station.mchp-main.com (10.10.76.4) by chn-sv-exch02.mchp-main.com (10.10.76.38) with Microsoft SMTP Server id 14.3.352.0; Tue, 22 May 2018 00:55:41 -0700 From: Eugen Hristev To: , , , , , , , , , , Subject: [PATCH v7 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings Date: Tue, 22 May 2018 10:52:34 +0300 Message-ID: <1526975559-18966-5-git-send-email-eugen.hristev@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1526975559-18966-1-git-send-email-eugen.hristev@microchip.com> References: <1526975559-18966-1-git-send-email-eugen.hristev@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180522_005552_473319_72205F4A X-CRM114-Status: GOOD ( 11.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eugen Hristev Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 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"; + };