69 	/* GPIO connected to CNV pin. */
70 	struct gpio_desc *cnv;  member
91 /* quite time before CNV rising edge */
93 /* minimum CNV high time to trigger conversion */
193 	 * CS is tied to CNV and we need a low to high transition to start the  in ad7944_3wire_cs_mode_init_msg()
194 	 * conversion, so place CNV low for t_QUIET to prepare for this.  in ad7944_3wire_cs_mode_init_msg()
256 	 * We only support CNV connected to CS in chain mode and we need CNV  in ad7944_chain_mode_init_msg()
263 	/* CNV has to be high for full conversion time before reading data. */  in ad7944_chain_mode_init_msg()
291 	 * CS is tied to CNV and we need a low to high transition to start the  in ad7944_3wire_cs_mode_init_offload_msg()
292 	 * conversion, so place CNV low for t_QUIET to prepare for this.  in ad7944_3wire_cs_mode_init_offload_msg()
296 	/* CNV has to be high for a minimum time to trigger conversion. */  in ad7944_3wire_cs_mode_init_offload_msg()
334 	 * In 4-wire mode, the CNV line is held high for the entire conversion  in ad7944_convert_and_acquire()
335 	 * and acquisition process. In other modes adc->cnv is NULL and is  in ad7944_convert_and_acquire()
336 	 * ignored (CS is wired to CNV in those cases).  in ad7944_convert_and_acquire()
338 	gpiod_set_value_cansleep(adc->cnv, 1);  in ad7944_convert_and_acquire()
340 	gpiod_set_value_cansleep(adc->cnv, 0);  in ad7944_convert_and_acquire()
722 	adc->cnv = devm_gpiod_get_optional(dev, "cnv", GPIOD_OUT_LOW);  in ad7944_probe()
723 	if (IS_ERR(adc->cnv))  in ad7944_probe()
724 		return dev_err_probe(dev, PTR_ERR(adc->cnv),  in ad7944_probe()
725 				     "failed to get CNV GPIO\n");  in ad7944_probe()
727 	if (!adc->cnv && adc->spi_mode == AD7944_SPI_MODE_DEFAULT)  in ad7944_probe()
728 		return dev_err_probe(&spi->dev, -EINVAL, "CNV GPIO is required\n");  in ad7944_probe()
729 	if (adc->cnv && adc->spi_mode != AD7944_SPI_MODE_DEFAULT)  in ad7944_probe()
731 				     "CNV GPIO in single and chain mode is not currently supported\n");  in ad7944_probe()