From patchwork Wed Nov 10 14:42:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 12612237 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3D62C433EF for ; Wed, 10 Nov 2021 14:42:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89F3B6115A for ; Wed, 10 Nov 2021 14:42:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232157AbhKJOpe (ORCPT ); Wed, 10 Nov 2021 09:45:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:41616 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231683AbhKJOpd (ORCPT ); Wed, 10 Nov 2021 09:45:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6B0C3611ED; Wed, 10 Nov 2021 14:42:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1636555366; bh=tC1ay4NT+xhM56QsIX0XWFGcs6173jr/v3I3PemOlNs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PMoaFBe5Xs1woHmwcA9VGjoJdo+WLviURJgiDU0V9c8VnAInQmtDk7lwY6q4mqhhq AToKE0e4t+lJQlRPuP6/9oKiQZhFfTV1Kz1kpzFSS6fxfPfTjH3AUMWvUoA1Qe+Xo2 ek1zbSkRM0396/xfT/j/D4JVdat7BKniXhOJscDUgfOM3R5QM7+Bf+2LpbBBFn5Xel NSau0DfUtWk/46xPjifgqS4hONESg72SMsS+HXOkxUmeUa91/3Z4rssuFz2s2Cr1gS Dq3FPUgH6jppm805fhUhRZroMUQdfvz/1m+HHE4L1NJ6/k58ghF8Kr3p4YLxb4cvPE pm47ofqZCET/Q== From: Lorenzo Bianconi To: jic23@kernel.org Cc: lorenzo.bianconi@redhat.com, linux-iio@vger.kernel.org, mario.tesi@st.com, devicetree@vger.kernel.org Subject: [PATCH 1/2] iio: imu: st_lsm6dsx: add dts property to disable sensor-hub Date: Wed, 10 Nov 2021 15:42:32 +0100 Message-Id: <78e0ba2979aca8cc1894fe4c99e784591ba681f1.1636552075.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Introduce the capability to disable sensorhub through a device-tree property since there are some configurations where users want to explicitly disable sensor-hub auto-probing at bootstrap. A typical configuration is when the sensorhub clock/data lines are connected to a pull-up resistor since no slave sensors are connected to the i2c master. If SDO/SA0 line is connected to the same pull-up resistor, when the driver tries to probe slave devices connected on sensor-hub, it will force SDO/SA0 line to low, modifying the device i2c address. Tested-by: Mario Tesi Signed-off-by: Lorenzo Bianconi --- drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index f2cbbc756459..82ac6c59ca03 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -2244,7 +2244,9 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, return err; hub_settings = &hw->settings->shub_settings; - if (hub_settings->master_en.addr) { + if (hub_settings->master_en.addr && + (!dev_fwnode(dev) || + !device_property_read_bool(dev, "st,disable-shub"))) { err = st_lsm6dsx_shub_probe(hw, name); if (err < 0) return err;