1 // SPDX-License-Identifier: GPL-2.0-only
3  * Analog Devices AD9467 SPI ADC driver
5  * Copyright 2012-2020 Analog Devices Inc.
12 #include <linux/spi/spi.h>
22 #include <linux/clk.h>
24 #include <linux/iio/adc/adi-axi-adc.h>
27  * ADI High-Speed ADC common spi interface registers
28  * See Application-Note AN-877:
29  *   https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
80  * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
88  * Analog Devices AD9434 12-Bit, 370/500 MSPS ADC
96  * Analog Devices AD9467 16-Bit, 200/250 MSPS ADC
119 	struct spi_device		*spi;  member
120 	struct clk			*clk;  member
127 static int ad9467_spi_read(struct spi_device *spi, unsigned int reg)  in ad9467_spi_read()  argument
135 	ret = spi_write_then_read(spi,  in ad9467_spi_read()
145 static int ad9467_spi_write(struct spi_device *spi, unsigned int reg,  in ad9467_spi_write()  argument
154 	return spi_write(spi, buf, ARRAY_SIZE(buf));  in ad9467_spi_write()
161 	struct spi_device *spi = st->spi;  in ad9467_reg_access()  local
165 		ret = ad9467_spi_write(spi, reg, writeval);  in ad9467_reg_access()
166 		ad9467_spi_write(spi, AN877_ADC_REG_TRANSFER,  in ad9467_reg_access()
171 	ret = ad9467_spi_read(spi, reg);  in ad9467_reg_access()
198 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in __ad9467_get_scale()
199 	const struct iio_chan_spec *chan = &info->channels[0];  in __ad9467_get_scale()
202 	tmp = (info->scale_table[index][0] * 1000000ULL) >>  in __ad9467_get_scale()
203 			chan->scan_type.realbits;  in __ad9467_get_scale()
272 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_get_scale()
277 	vref_val = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);  in ad9467_get_scale()
279 	vref_val &= info1->vref_mask;  in ad9467_get_scale()
281 	for (i = 0; i < info->num_scales; i++) {  in ad9467_get_scale()
282 		if (vref_val == info->scale_table[i][1])  in ad9467_get_scale()
286 	if (i == info->num_scales)  in ad9467_get_scale()
287 		return -ERANGE;  in ad9467_get_scale()
296 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_set_scale()
302 		return -EINVAL;  in ad9467_set_scale()
304 	for (i = 0; i < info->num_scales; i++) {  in ad9467_set_scale()
309 		ad9467_spi_write(st->spi, AN877_ADC_REG_VREF,  in ad9467_set_scale()
310 				 info->scale_table[i][1]);  in ad9467_set_scale()
311 		ad9467_spi_write(st->spi, AN877_ADC_REG_TRANSFER,  in ad9467_set_scale()
316 	return -EINVAL;  in ad9467_set_scale()
329 		*val = clk_get_rate(st->clk);  in ad9467_read_raw()
333 		return -EINVAL;  in ad9467_read_raw()
341 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_write_raw()
349 		r_clk = clk_round_rate(st->clk, val);  in ad9467_write_raw()
350 		if (r_clk < 0 || r_clk > info->max_rate) {  in ad9467_write_raw()
351 			dev_warn(&st->spi->dev,  in ad9467_write_raw()
353 			return -EINVAL;  in ad9467_write_raw()
356 		return clk_set_rate(st->clk, r_clk);  in ad9467_write_raw()
358 		return -EINVAL;  in ad9467_write_raw()
362 static int ad9467_outputmode_set(struct spi_device *spi, unsigned int mode)  in ad9467_outputmode_set()  argument
366 	ret = ad9467_spi_write(spi, AN877_ADC_REG_OUTPUT_MODE, mode);  in ad9467_outputmode_set()
370 	return ad9467_spi_write(spi, AN877_ADC_REG_TRANSFER,  in ad9467_outputmode_set()
378 	return ad9467_outputmode_set(st->spi, st->output_mode);  in ad9467_preenable_setup()
381 static int ad9467_probe(struct spi_device *spi)  in ad9467_probe()  argument
389 	info = of_device_get_match_data(&spi->dev);  in ad9467_probe()
391 		return -ENODEV;  in ad9467_probe()
393 	conv = devm_adi_axi_adc_conv_register(&spi->dev, sizeof(*st));  in ad9467_probe()
398 	st->spi = spi;  in ad9467_probe()
400 	st->clk = devm_clk_get_enabled(&spi->dev, "adc-clk");  in ad9467_probe()
401 	if (IS_ERR(st->clk))  in ad9467_probe()
402 		return PTR_ERR(st->clk);  in ad9467_probe()
404 	st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",  in ad9467_probe()
406 	if (IS_ERR(st->pwrdown_gpio))  in ad9467_probe()
407 		return PTR_ERR(st->pwrdown_gpio);  in ad9467_probe()
409 	st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",  in ad9467_probe()
411 	if (IS_ERR(st->reset_gpio))  in ad9467_probe()
412 		return PTR_ERR(st->reset_gpio);  in ad9467_probe()
414 	if (st->reset_gpio) {  in ad9467_probe()
416 		ret = gpiod_direction_output(st->reset_gpio, 1);  in ad9467_probe()
422 	conv->chip_info = &info->axi_adc_info;  in ad9467_probe()
424 	id = ad9467_spi_read(spi, AN877_ADC_REG_CHIP_ID);  in ad9467_probe()
425 	if (id != conv->chip_info->id) {  in ad9467_probe()
426 		dev_err(&spi->dev, "Mismatch CHIP_ID, got 0x%X, expected 0x%X\n",  in ad9467_probe()
427 			id, conv->chip_info->id);  in ad9467_probe()
428 		return -ENODEV;  in ad9467_probe()
431 	conv->reg_access = ad9467_reg_access;  in ad9467_probe()
432 	conv->write_raw = ad9467_write_raw;  in ad9467_probe()
433 	conv->read_raw = ad9467_read_raw;  in ad9467_probe()
434 	conv->preenable_setup = ad9467_preenable_setup;  in ad9467_probe()
436 	st->output_mode = info->default_output_mode |  in ad9467_probe()