1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
9 #include <dt-bindings/iio/adc/fsl-imx25-gcq.h>
13 #include <linux/mfd/imx25-tsadc.h>
23 static const char * const driver_name = "mx25-gcq";
42 	struct regulator *vref[4];  member
87 	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);  in mx25_gcq_irq()
90 		regmap_set_bits(priv->regs, MX25_ADCQ_MR,  in mx25_gcq_irq()
92 		complete(&priv->completed);  in mx25_gcq_irq()
96 	regmap_clear_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS);  in mx25_gcq_irq()
99 	regmap_write(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |  in mx25_gcq_irq()
115 	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,  in mx25_gcq_get_raw_value()
116 		     MX25_ADCQ_ITEM(0, chan->channel));  in mx25_gcq_get_raw_value()
118 	regmap_clear_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_EOQ_IRQ);  in mx25_gcq_get_raw_value()
121 	regmap_set_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS);  in mx25_gcq_get_raw_value()
124 		&priv->completed, MX25_GCQ_TIMEOUT);  in mx25_gcq_get_raw_value()
130 		return -ETIMEDOUT;  in mx25_gcq_get_raw_value()
133 	regmap_read(priv->regs, MX25_ADCQ_FIFO, &data);  in mx25_gcq_get_raw_value()
149 		mutex_lock(&priv->lock);  in mx25_gcq_read_raw()
150 		ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val);  in mx25_gcq_read_raw()
151 		mutex_unlock(&priv->lock);  in mx25_gcq_read_raw()
155 		*val = priv->channel_vref_mv[chan->channel];  in mx25_gcq_read_raw()
160 		return -EINVAL;  in mx25_gcq_read_raw()
181 	if (priv->vref[refp])  in mx25_gcq_ext_regulator_setup()
184 	ret = snprintf(reg_name, sizeof(reg_name), "vref-%s",  in mx25_gcq_ext_regulator_setup()
189 	priv->vref[refp] = devm_regulator_get_optional(dev, reg_name);  in mx25_gcq_ext_regulator_setup()
190 	if (IS_ERR(priv->vref[refp]))  in mx25_gcq_ext_regulator_setup()
191 		return dev_err_probe(dev, PTR_ERR(priv->vref[refp]),  in mx25_gcq_ext_regulator_setup()
201 	struct device *dev = &pdev->dev;  in mx25_gcq_setup_cfgs()
209 		regmap_write(priv->regs, MX25_ADCQ_CFG(i),  in mx25_gcq_setup_cfgs()
228 			return dev_err_probe(dev, -EINVAL,  in mx25_gcq_setup_cfgs()
231 		fwnode_property_read_u32(child, "fsl,adc-refp", &refp);  in mx25_gcq_setup_cfgs()
232 		fwnode_property_read_u32(child, "fsl,adc-refn", &refn);  in mx25_gcq_setup_cfgs()
238 			ret = mx25_gcq_ext_regulator_setup(&pdev->dev, priv, refp);  in mx25_gcq_setup_cfgs()
241 			priv->channel_vref_mv[reg] =  in mx25_gcq_setup_cfgs()
242 				regulator_get_voltage(priv->vref[refp]);  in mx25_gcq_setup_cfgs()
243 			/* Conversion from uV to mV */  in mx25_gcq_setup_cfgs()
244 			priv->channel_vref_mv[reg] /= 1000;  in mx25_gcq_setup_cfgs()
247 			priv->channel_vref_mv[reg] = 2500;  in mx25_gcq_setup_cfgs()
250 			return dev_err_probe(dev, -EINVAL,  in mx25_gcq_setup_cfgs()
262 			return dev_err_probe(dev, -EINVAL,  in mx25_gcq_setup_cfgs()
263 					     "Invalid fsl,adc-refp property value\n");  in mx25_gcq_setup_cfgs()
266 			return dev_err_probe(dev, -EINVAL,  in mx25_gcq_setup_cfgs()
267 					     "Invalid fsl,adc-refn property value\n");  in mx25_gcq_setup_cfgs()
269 		regmap_update_bits(priv->regs, MX25_ADCQ_CFG(reg),  in mx25_gcq_setup_cfgs()
274 	regmap_set_bits(priv->regs, MX25_ADCQ_CR,  in mx25_gcq_setup_cfgs()
277 	regmap_write(priv->regs, MX25_ADCQ_CR,  in mx25_gcq_setup_cfgs()
298 	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);  in mx25_gcq_probe()
299 	struct device *dev = &pdev->dev;  in mx25_gcq_probe()
306 		return -ENOMEM;  in mx25_gcq_probe()
314 	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);  in mx25_gcq_probe()
315 	if (IS_ERR(priv->regs))  in mx25_gcq_probe()
316 		return dev_err_probe(dev, PTR_ERR(priv->regs),  in mx25_gcq_probe()
319 	mutex_init(&priv->lock);  in mx25_gcq_probe()
321 	init_completion(&priv->completed);  in mx25_gcq_probe()
328 		if (!priv->vref[i])  in mx25_gcq_probe()
331 		ret = regulator_enable(priv->vref[i]);  in mx25_gcq_probe()
336 					       priv->vref[i]);  in mx25_gcq_probe()
341 	priv->clk = tsadc->clk;  in mx25_gcq_probe()
342 	ret = clk_prepare_enable(priv->clk);  in mx25_gcq_probe()
347 				       priv->clk);  in mx25_gcq_probe()
355 	priv->irq = ret;  in mx25_gcq_probe()
356 	ret = devm_request_irq(dev, priv->irq, mx25_gcq_irq, 0, pdev->name,  in mx25_gcq_probe()
361 	indio_dev->channels = mx25_gcq_channels;  in mx25_gcq_probe()
362 	indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);  in mx25_gcq_probe()
363 	indio_dev->info = &mx25_gcq_iio_info;  in mx25_gcq_probe()
364 	indio_dev->name = driver_name;  in mx25_gcq_probe()
374 	{ .compatible = "fsl,imx25-gcq", },
381 		.name	= "mx25-gcq",