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c=relaxed/relaxed; d=subdimension.ro; s=mail; t=1759669986; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DDEOtfTru/Ogw9pyS3SwcWFlvIzmPM6wcAxTmLyFrWM=; b=LVI2kd9wWQOq5UwQsQ27LdUd59lBSQr6ph1dZVYwfzRTQSyO0ADfWetQCJJxowG1J53Cj8 PpKJU4qHBMTTtJUF3xgiumJH772hXQy7wHaSdWrLX49Xi24+opxTWIEFNevGlQcrl8ftSA Tvxbw2e1N4j9aGBgfilIZKfaQGeAzgBHykd96DHEc1m4LkVtba/0pSg2+tVT5/tUhVIMOm a1v8H0VAgRBf9nK+bMpo+cHeSJETDZ2QA4tHKkHdjp6mH/klM4OppmT9n8lHbUrYOKEYoS 4U1bShK5zx0wrS4AJicmwWO0/FC6ZIh/O3mrDZ9C0QetvYDExRIkmvoiYyHpRQ== From: Petre Rodan Date: Sun, 05 Oct 2025 16:12:24 +0300 Subject: [PATCH v4 15/19] iio: accel: bma220: add i2c watchdog feature Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251005-b4-bma220_improvements-v4-15-0f449ba31585@subdimension.ro> References: <20251005-b4-bma220_improvements-v4-0-0f449ba31585@subdimension.ro> In-Reply-To: <20251005-b4-bma220_improvements-v4-0-0f449ba31585@subdimension.ro> To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Jonathan Cameron , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=D80A7FC176151935EC3E5FA9CF269999844E7F30 Sometimes the sensor gets stuck and enters a condition in which it pulls SDA low, thus making the entire i2c bus unusable. This problem is mitigated by activating a 1ms watchdog implemented in the sensor. Signed-off-by: Petre Rodan --- v1->v2 - hardcode 1ms timer watchdog to any i2c-based sensor instead of configuring a dt-based property - rename bma220_wdt() to bma220_set_wdt() v2->v4 no change --- drivers/iio/accel/bma220_core.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_cor= e.c index a3faf1f5ec6d79f2c6105697b404d6eb1f4501db..a957751be40c63c25963283be81= 3db97f73bf004 100644 --- a/drivers/iio/accel/bma220_core.c +++ b/drivers/iio/accel/bma220_core.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -355,6 +356,12 @@ static int bma220_power(struct bma220_data *data, bool= up) return -EBUSY; } =20 +static int bma220_set_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 device *dev, struct bma220_data *data) { int ret; @@ -383,6 +390,13 @@ static int bma220_init(struct device *dev, struct bma2= 20_data *data) if (ret) return dev_err_probe(dev, ret, "Failed to soft reset chip\n"); =20 + if (i2c_verify_client(dev)) { + ret =3D bma220_set_wdt(data, BMA220_WDT_1MS); + if (ret) + return dev_err_probe(dev, ret, + "Failed to set i2c watchdog\n"); + } + return 0; } =20 --=20 2.49.1