From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: Eddie James <eajames@linux.ibm.com>
Cc: <linux-iio@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<krzysztof.kozlowski+dt@linaro.org>, <robh+dt@kernel.org>,
<lars@metafoo.de>, <jic23@kernel.org>, <miltonm@us.ibm.com>
Subject: Re: [PATCH v2 0/2] iio: humidity: si7020: Check device property for skipping reset in probe
Date: Thu, 12 May 2022 17:48:59 +0100 [thread overview]
Message-ID: <20220512174859.000042b6@Huawei.com> (raw)
In-Reply-To: <20220512162020.33450-1-eajames@linux.ibm.com>
On Thu, 12 May 2022 11:20:18 -0500
Eddie James <eajames@linux.ibm.com> wrote:
> I2C commands issued after the SI7020 is starting up or after reset
> can potentially upset the startup sequence. Therefore, the host
> needs to wait for the startup sequence to finish before issuing
> further i2c commands. This is impractical in cases where the SI7020
> is on a shared bus or behind a mux, which may switch channels at
> any time (generating I2C traffic). Therefore, check for a device
> property that indicates that the driver should skip resetting the
> device when probing.
Why not lock the bus? It's not ideal, but then not resetting and hence
potentially ending up in an unknown state isn't great either.
Jonathan
>
> Changes since v1:
> - Fix dt binding document
>
> Eddie James (2):
> dt-bindings: iio: humidity: Add si7020 bindings
> iio: humidity: si7020: Check device property for skipping reset in probe
>
> .../bindings/iio/humidity/silabs,si7020.yaml | 47 +++++++++++++++++++
> .../devicetree/bindings/trivial-devices.yaml | 2 -
> drivers/iio/humidity/si7020.c | 14 +++---
> 3 files changed, 55 insertions(+), 8 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/humidity/silabs,si7020.yaml
>
next prev parent reply other threads:[~2022-05-12 16:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 16:20 [PATCH v2 0/2] iio: humidity: si7020: Check device property for skipping reset in probe Eddie James
2022-05-12 16:20 ` [PATCH v2 1/2] dt-bindings: iio: humidity: Add si7020 bindings Eddie James
2022-05-12 16:51 ` Jonathan Cameron
2022-05-12 17:08 ` Eddie James
2022-05-13 16:47 ` Jonathan Cameron
2022-05-13 8:55 ` Krzysztof Kozlowski
2022-05-12 16:20 ` [PATCH v2 2/2] iio: humidity: si7020: Check device property for skipping reset in probe Eddie James
2022-05-12 16:48 ` Jonathan Cameron [this message]
2022-05-12 17:08 ` [PATCH v2 0/2] " Eddie James
2022-05-13 16:45 ` Jonathan Cameron
2022-05-13 22:48 ` Peter Rosin
2022-05-14 13:43 ` Jonathan Cameron
2022-05-14 15:02 ` Peter Rosin
2022-05-18 15:28 ` Eddie James
2022-05-18 15:51 ` Eddie James
2022-05-12 19:11 ` Eddie James
2022-05-14 13:40 ` Jonathan Cameron
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