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Fri, 12 Sep 2025 02:30:48 -0700 (PDT) Message-ID: Date: Fri, 12 Sep 2025 12:30:47 +0300 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 v4 2/3] iio: adc: Support ROHM BD79112 ADC/GPIO To: David Lechner , Jonathan Cameron , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij , Bartosz Golaszewski Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org References: <20250910-bd79112-v4-0-f82f43746a8c@gmail.com> <20250910-bd79112-v4-2-f82f43746a8c@gmail.com> <92306c8a-a2ec-4a43-80d7-c8e0c1cc0ee1@baylibre.com> Content-Language: en-US, en-AU, en-GB, en-BW From: Matti Vaittinen In-Reply-To: <92306c8a-a2ec-4a43-80d7-c8e0c1cc0ee1@baylibre.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/09/2025 00:20, David Lechner wrote: > On 9/10/25 6:24 AM, Matti Vaittinen wrote: > > ... > >> diff --git a/drivers/iio/adc/rohm-bd79112.c b/drivers/iio/adc/rohm-bd79112.c >> new file mode 100644 >> index 0000000000000000000000000000000000000000..a2a3affe2c6dc86a237a164139c27ec66dc9d131 >> --- /dev/null >> +++ b/drivers/iio/adc/rohm-bd79112.c >> @@ -0,0 +1,553 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> +/* >> + * ROHM ADC driver for BD79112 signal monitoring hub. >> + * Copyright (C) 2025, ROHM Semiconductor. >> + * >> + * SPI communication derived from ad7923.c and ti-ads7950.c > > Really? I wrote the ti-ads7950 driver and I can't say I see the > resemblance. ;-) Really. :) I picked the idea of populating the transfers in the probe and using buffers from the driver-data, from these drivers :) Well, I admit it ended up being a bit different - but the starting point was those drivers ;) > >> + */ >> + > > ... > >> +static int bd79112_get_gpio_pins(const struct iio_chan_spec *cs, int num_channels) > > u32 would make more sense when dealing with bit flags. > >> +{ >> + int i, gpio_channels; > > same for the local variable. Meh. Ok :) > ... > >> +static int bd79112_probe(struct spi_device *spi) >> +{ > > ... > >> + >> + data->read_xfer[0].tx_buf = &data->read_tx[0]; >> + data->read_xfer[0].len = sizeof(data->read_tx); >> + data->read_xfer[0].cs_change = 1; >> + data->read_xfer[1].rx_buf = &data->read_rx; >> + data->read_xfer[1].len = sizeof(data->read_rx); >> + spi_message_init_with_transfers(&data->read_msg, data->read_xfer, 2); >> + >> + data->write_xfer.tx_buf = &data->reg_write_tx[0]; >> + data->write_xfer.len = sizeof(data->reg_write_tx); >> + spi_message_init_with_transfers(&data->write_msg, &data->write_xfer, 1); > > If these messages never change (other than the data in the buffers), you can > call devm_spi_optimize_message() here on each message to get reduced CPU usage > on every SPI message for free. > Thanks! Yours, -- Matti