60 	/* GPIO connected to CNV pin. */
61 	struct gpio_desc *cnv;  member
82 /* quite time before CNV rising edge */
150 	 * CS is tied to CNV and we need a low to high transition to start the  in ad7944_3wire_cs_mode_init_msg()
151 	 * conversion, so place CNV low for t_QUIET to prepare for this.  in ad7944_3wire_cs_mode_init_msg()
219 	 * We only support CNV connected to CS in chain mode and we need CNV  in ad7944_chain_mode_init_msg()
226 	/* CNV has to be high for full conversion time before reading data. */  in ad7944_chain_mode_init_msg()
255 	 * In 4-wire mode, the CNV line is held high for the entire conversion  in ad7944_convert_and_acquire()
256 	 * and acquisition process. In other modes adc->cnv is NULL and is  in ad7944_convert_and_acquire()
257 	 * ignored (CS is wired to CNV in those cases).  in ad7944_convert_and_acquire()
259 	gpiod_set_value_cansleep(adc->cnv, 1);  in ad7944_convert_and_acquire()
261 	gpiod_set_value_cansleep(adc->cnv, 0);  in ad7944_convert_and_acquire()
526 	adc->cnv = devm_gpiod_get_optional(dev, "cnv", GPIOD_OUT_LOW);  in ad7944_probe()
527 	if (IS_ERR(adc->cnv))  in ad7944_probe()
528 		return dev_err_probe(dev, PTR_ERR(adc->cnv),  in ad7944_probe()
529 				     "failed to get CNV GPIO\n");  in ad7944_probe()
531 	if (!adc->cnv && adc->spi_mode == AD7944_SPI_MODE_DEFAULT)  in ad7944_probe()
532 		return dev_err_probe(&spi->dev, -EINVAL, "CNV GPIO is required\n");  in ad7944_probe()
533 	if (adc->cnv && adc->spi_mode != AD7944_SPI_MODE_DEFAULT)  in ad7944_probe()
535 				     "CNV GPIO in single and chain mode is not currently supported\n");  in ad7944_probe()