1 // SPDX-License-Identifier: GPL-2.0-only
3  * Aspeed AST2400/2500 ADC
9 #include <linux/clk-provider.h>
96 			of_device_get_match_data(data->dev);  in aspeed_adc_read_raw()
100 		*val = readw(data->base + chan->address);  in aspeed_adc_read_raw()
104 		*val = model_data->vref_voltage;  in aspeed_adc_read_raw()
109 		*val = clk_get_rate(data->clk_scaler->clk) /  in aspeed_adc_read_raw()
114 		return -EINVAL;  in aspeed_adc_read_raw()
124 			of_device_get_match_data(data->dev);  in aspeed_adc_write_raw()
128 		if (val < model_data->min_sampling_rate ||  in aspeed_adc_write_raw()
129 			val > model_data->max_sampling_rate)  in aspeed_adc_write_raw()
130 			return -EINVAL;  in aspeed_adc_write_raw()
132 		clk_set_rate(data->clk_scaler->clk,  in aspeed_adc_write_raw()
144 		return -EPERM;  in aspeed_adc_write_raw()
147 		return -EINVAL;  in aspeed_adc_write_raw()
158 		return -EINVAL;  in aspeed_adc_reg_access()
160 	*readval = readl(data->base + reg);  in aspeed_adc_reg_access()
180 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data));  in aspeed_adc_probe()
182 		return -ENOMEM;  in aspeed_adc_probe()
185 	data->dev = &pdev->dev;  in aspeed_adc_probe()
188 	data->base = devm_platform_ioremap_resource(pdev, 0);  in aspeed_adc_probe()
189 	if (IS_ERR(data->base))  in aspeed_adc_probe()
190 		return PTR_ERR(data->base);  in aspeed_adc_probe()
192 	/* Register ADC clock prescaler with source specified by device tree. */  in aspeed_adc_probe()
193 	spin_lock_init(&data->clk_lock);  in aspeed_adc_probe()
194 	clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0);  in aspeed_adc_probe()
196 	data->clk_prescaler = clk_hw_register_divider(  in aspeed_adc_probe()
197 				&pdev->dev, "prescaler", clk_parent_name, 0,  in aspeed_adc_probe()
198 				data->base + ASPEED_REG_CLOCK_CONTROL,  in aspeed_adc_probe()
199 				17, 15, 0, &data->clk_lock);  in aspeed_adc_probe()
200 	if (IS_ERR(data->clk_prescaler))  in aspeed_adc_probe()
201 		return PTR_ERR(data->clk_prescaler);  in aspeed_adc_probe()
204 	 * Register ADC clock scaler downstream from the prescaler. Allow rate  in aspeed_adc_probe()
207 	data->clk_scaler = clk_hw_register_divider(  in aspeed_adc_probe()
208 				&pdev->dev, "scaler", "prescaler",  in aspeed_adc_probe()
210 				data->base + ASPEED_REG_CLOCK_CONTROL,  in aspeed_adc_probe()
211 				0, 10, 0, &data->clk_lock);  in aspeed_adc_probe()
212 	if (IS_ERR(data->clk_scaler)) {  in aspeed_adc_probe()
213 		ret = PTR_ERR(data->clk_scaler);  in aspeed_adc_probe()
217 	data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);  in aspeed_adc_probe()
218 	if (IS_ERR(data->rst)) {  in aspeed_adc_probe()
219 		dev_err(&pdev->dev,  in aspeed_adc_probe()
221 		ret = PTR_ERR(data->rst);  in aspeed_adc_probe()
224 	reset_control_deassert(data->rst);  in aspeed_adc_probe()
226 	model_data = of_device_get_match_data(&pdev->dev);  in aspeed_adc_probe()
228 	if (model_data->wait_init_sequence) {  in aspeed_adc_probe()
231 		       data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
234 		ret = readl_poll_timeout(data->base + ASPEED_REG_ENGINE_CONTROL,  in aspeed_adc_probe()
245 	ret = clk_prepare_enable(data->clk_scaler->clk);  in aspeed_adc_probe()
252 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
254 	model_data = of_device_get_match_data(&pdev->dev);  in aspeed_adc_probe()
255 	indio_dev->name = model_data->model_name;  in aspeed_adc_probe()
256 	indio_dev->info = &aspeed_adc_iio_info;  in aspeed_adc_probe()
257 	indio_dev->modes = INDIO_DIRECT_MODE;  in aspeed_adc_probe()
258 	indio_dev->channels = aspeed_adc_iio_channels;  in aspeed_adc_probe()
259 	indio_dev->num_channels = ARRAY_SIZE(aspeed_adc_iio_channels);  in aspeed_adc_probe()
269 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
270 	clk_disable_unprepare(data->clk_scaler->clk);  in aspeed_adc_probe()
273 	reset_control_assert(data->rst);  in aspeed_adc_probe()
275 	clk_hw_unregister_divider(data->clk_scaler);  in aspeed_adc_probe()
277 	clk_hw_unregister_divider(data->clk_prescaler);  in aspeed_adc_probe()
288 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_remove()
289 	clk_disable_unprepare(data->clk_scaler->clk);  in aspeed_adc_remove()
290 	reset_control_assert(data->rst);  in aspeed_adc_remove()
291 	clk_hw_unregister_divider(data->clk_scaler);  in aspeed_adc_remove()
292 	clk_hw_unregister_divider(data->clk_prescaler);  in aspeed_adc_remove()
298 	.model_name = "ast2400-adc",
305 	.model_name = "ast2500-adc",
313 	{ .compatible = "aspeed,ast2400-adc", .data = &ast2400_model_data },
314 	{ .compatible = "aspeed,ast2500-adc", .data = &ast2500_model_data },
331 MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver");