From nobody Fri Oct 3 12:26:32 2025 Received: from mail.subdimension.ro (nalicastle.subdimension.ro [172.105.74.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE2C321019C; Mon, 1 Sep 2025 19:48:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=172.105.74.154 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756756086; cv=none; b=ZDvxBRQKH3VeedQMxVvQI8Irnb6JA8TkSvOoL6Dp0ed6KRjU3KHPhJD11vZbR7gOZ2KOahb/BJnrNtE1eCXB9Wh3REWu/+KVECnj5AE4V9GCg1Q3THweq1ZeLz+ZD4EMpqLGtpucIAa6uy8Mi5gkL2bjF3y8NV99v5KCEeiIK6I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756756086; c=relaxed/simple; bh=Tepe2HnmOQQtLKDtH3w0ZwrujUeBKRNKyeiSGGFLgT0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=knV/pWP06zV6Vtx65LFh/+Ycn6MpTr+dzVXxNxhF9Vwfz9Rgv8G+MtDnHAD6EUiX+17NTGEWtuGo/1ZyDL6LQ21OkCIZlzvqEBbeeIADb4ca7HOwcVfBH662+nrlMxjg/SoJqG2HHLjMN7lSHw9LX6LN0uITfRappwcU/3LlaUs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=subdimension.ro; spf=pass smtp.mailfrom=subdimension.ro; dkim=pass (2048-bit key) header.d=subdimension.ro header.i=@subdimension.ro header.b=40jOoNYa; arc=none smtp.client-ip=172.105.74.154 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=subdimension.ro Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=subdimension.ro Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=subdimension.ro header.i=@subdimension.ro header.b="40jOoNYa" Received: from localhost.localdomain (unknown [IPv6:2a02:2f0e:3503:4a00:e2d5:5eff:fed9:f1c4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.subdimension.ro (Postfix) with ESMTPSA id 5615D173BED; Mon, 01 Sep 2025 22:47:56 +0300 (EEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=subdimension.ro; s=mail; t=1756756076; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8037ziBQdvZlRDgfvedaXrcP/LtyZMhTXyYaCxnZVyc=; b=40jOoNYazEhJm79D9WXOe5HjI8YjXZl2uw1rA4Jz1ipRCFnxXfV2i4TwdHCQtqV4FTXMpx ZGhh1hsJiN5bghqli5SgtJs+H2Aa6n9Ku3n93pzi6N1bCmXphVpHHreUUtw9yJwm8TO5Yw Shaags3UD7mF+7CzC9jQGhXoabvn3xhJ/4gMrs7KuqoYdGttWWmh0Zg5OIfN77d89VgHpF 6aHhjSsggI4kDQws7zXikLvrpKhb32c9umerfbd49SKP74ez1Y3OZ9073PmvOg7+TYTI1g l8z0WZtHlkNZMGYjy1RlSgY/Iyc5nUA/BThVWvMQgdM7YUI/+nzJ9ikjnWmG3g== From: Petre Rodan To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Petre Rodan , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko Subject: [PATCH 05/10] iio: accel: BMA220 make use of the watchdog functionality Date: Mon, 1 Sep 2025 22:47:31 +0300 Message-ID: <20250901194742.11599-6-petre.rodan@subdimension.ro> X-Mailer: git-send-email 2.49.1 In-Reply-To: <20250901194742.11599-1-petre.rodan@subdimension.ro> References: <20250901194742.11599-1-petre.rodan@subdimension.ro> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Sometimes the sensor gets stuck and enters a condition in which it pulls SDA low, thus making the entire i2c bus unusable. The optional bosch,watchdog property mitigates this problem by clearing the condition after a period of 1 or 10ms. Signed-off-by: Petre Rodan --- drivers/iio/accel/bma220_core.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_cor= e.c index fae84823d52b..86347cf8ab1e 100644 --- a/drivers/iio/accel/bma220_core.c +++ b/drivers/iio/accel/bma220_core.c @@ -158,6 +158,12 @@ enum bma220_axis { AXIS_Z, }; +enum bma220_prop_wdt { + BMA220_PROP_WDT_OFF, + BMA220_PROP_WDT_1MS, + BMA220_PROP_WDT_10MS, +}; + static const int bma220_scale_table[][2] =3D { {0, 623000}, {1, 248000}, {2, 491000}, {4, 983000}, }; @@ -428,10 +434,17 @@ static int bma220_power(struct bma220_data *data, boo= l up) return -EBUSY; } +static int bma220_wdt(struct bma220_data *data, const u8 val) +{ + return regmap_update_bits(data->regmap, BMA220_REG_WDT, BMA220_WDT_MASK, + FIELD_PREP(BMA220_WDT_MASK, val)); +} + static int bma220_init(struct bma220_data *data) { int ret; unsigned int val; + u32 watchdog; static const char * const regulator_names[] =3D { "vddd", "vddio", "vdda"= }; ret =3D devm_regulator_bulk_get_enable(data->dev, @@ -462,6 +475,25 @@ static int bma220_init(struct bma220_data *data) return ret; } + ret =3D device_property_read_u32(data->dev, "bosch,watchdog", &watchdog); + if (!ret) { + switch (watchdog) { + case BMA220_PROP_WDT_1MS: + ret =3D bma220_wdt(data, BMA220_WDT_1MS); + break; + case BMA220_PROP_WDT_10MS: + ret =3D bma220_wdt(data, BMA220_WDT_10MS); + break; + default: + ret =3D bma220_wdt(data, BMA220_WDT_OFF); + break; + } + if (ret) { + dev_err(data->dev, "Failed to set watchdog\n"); + return ret; + } + } + return 0; } -- 2.49.1