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([2a01:e11:5402:d840:f1ee:c5d:74e4:6e19]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fd64da1absm21690035e9.14.2026.05.13.13.29.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 May 2026 13:29:56 -0700 (PDT) Message-ID: <0de09560-6a79-46f0-8a63-3fb904a38231@gmail.com> Date: Wed, 13 May 2026 22:29:55 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/5] iio: light: tcs3472: use devm for resource management From: Aldo Conte To: jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, shuah@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, Joshua Crofts References: <20260512223215.25596-1-aldocontelk@gmail.com> <20260512223215.25596-4-aldocontelk@gmail.com> Content-Language: en-US In-Reply-To: <20260512223215.25596-4-aldocontelk@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/13/26 00:32, Aldo Conte wrote: > Convert the driver to use device-managed resource allocation: > - Add tcs3472_powerdown_action() and register it with > devm_add_action_or_reset() to ensure the device is powered down on > cleanup. Before this patch, the chip remained powered if probe > failed after enabling it. > - Replace iio_triggered_buffer_setup() with > devm_iio_triggered_buffer_setup(). > - Replace request_threaded_irq() with devm_request_threaded_irq(). > - Replace iio_device_register() with devm_iio_device_register(). > - Remove tcs3472_remove() as all cleanup is now handled by devm. > > Rewrite the read-modify-write pattern in tcs3472_powerdown() and > tcs3472_resume() so the new register value is computed first, written > to the chip, and committed to data->enable only on success. > > Use a local 'dev = &client->dev' in tcs3472_probe() to keep the devm > calls compact. > > Suggested-by: Andy Shevchenko > Signed-off-by: Aldo Conte > --- > v2: > (Suggested by Andy) > - Rewrote read-modify-write in tcs3472_powerdown() and tcs3472_resume() > - Use local 'struct device *dev = &client->dev' in probe. > - Dropped "Compiled with W=1" and test details from the commit message. > > drivers/iio/light/tcs3472.c | 107 +++++++++++++++++------------------- > 1 file changed, 51 insertions(+), 56 deletions(-) > > diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c > index 4fd4fd74d0d6..7a6dc8360326 100644 > --- a/drivers/iio/light/tcs3472.c > +++ b/drivers/iio/light/tcs3472.c > @@ -427,13 +427,38 @@ static const struct iio_info tcs3472_info = { > .attrs = &tcs3472_attribute_group, > }; > > +static int tcs3472_powerdown(struct tcs3472_data *data) > +{ > + u8 enable_mask = TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON; > + u8 value; > + int ret; > + > + guard(mutex)(&data->lock); > + > + value = data->enable & ~enable_mask; > + > + ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, value); > + if (ret) > + return ret; > + > + data->enable = value; > + > + return 0; > +} > + > +static void tcs3472_powerdown_action(void *data) > +{ > + tcs3472_powerdown(data); > +} > + > static int tcs3472_probe(struct i2c_client *client) > { > + struct device *dev = &client->dev; > struct tcs3472_data *data; > struct iio_dev *indio_dev; > int ret; > > - indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); > if (indio_dev == NULL) > return -ENOMEM; > Hi Jonathan, In v3 I have a small style cleanup: replacing 'if (indio_dev == NULL)' with 'if (!indio_dev)' in tcs3472_probe(). This was suggested by Joshua Crofts in his v2 review. What do you prefer it is a separate patch or folded into the devm conversion patch (which already modifies the context next to that line). Either way works for me. Which do you prefer? Thanks, Aldo ...