2  * Aspeed AST2400/2500 ADC
13 #include <linux/clk-provider.h>
100 			of_device_get_match_data(data->dev);  in aspeed_adc_read_raw()
104 		*val = readw(data->base + chan->address);  in aspeed_adc_read_raw()
108 		*val = model_data->vref_voltage;  in aspeed_adc_read_raw()
113 		*val = clk_get_rate(data->clk_scaler->clk) /  in aspeed_adc_read_raw()
118 		return -EINVAL;  in aspeed_adc_read_raw()
128 			of_device_get_match_data(data->dev);  in aspeed_adc_write_raw()
132 		if (val < model_data->min_sampling_rate ||  in aspeed_adc_write_raw()
133 			val > model_data->max_sampling_rate)  in aspeed_adc_write_raw()
134 			return -EINVAL;  in aspeed_adc_write_raw()
136 		clk_set_rate(data->clk_scaler->clk,  in aspeed_adc_write_raw()
148 		return -EPERM;  in aspeed_adc_write_raw()
151 		return -EINVAL;  in aspeed_adc_write_raw()
162 		return -EINVAL;  in aspeed_adc_reg_access()
164 	*readval = readl(data->base + reg);  in aspeed_adc_reg_access()
185 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data));  in aspeed_adc_probe()
187 		return -ENOMEM;  in aspeed_adc_probe()
190 	data->dev = &pdev->dev;  in aspeed_adc_probe()
193 	data->base = devm_ioremap_resource(&pdev->dev, res);  in aspeed_adc_probe()
194 	if (IS_ERR(data->base))  in aspeed_adc_probe()
195 		return PTR_ERR(data->base);  in aspeed_adc_probe()
197 	/* Register ADC clock prescaler with source specified by device tree. */  in aspeed_adc_probe()
198 	spin_lock_init(&data->clk_lock);  in aspeed_adc_probe()
199 	clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0);  in aspeed_adc_probe()
201 	data->clk_prescaler = clk_hw_register_divider(  in aspeed_adc_probe()
202 				&pdev->dev, "prescaler", clk_parent_name, 0,  in aspeed_adc_probe()
203 				data->base + ASPEED_REG_CLOCK_CONTROL,  in aspeed_adc_probe()
204 				17, 15, 0, &data->clk_lock);  in aspeed_adc_probe()
205 	if (IS_ERR(data->clk_prescaler))  in aspeed_adc_probe()
206 		return PTR_ERR(data->clk_prescaler);  in aspeed_adc_probe()
209 	 * Register ADC clock scaler downstream from the prescaler. Allow rate  in aspeed_adc_probe()
212 	data->clk_scaler = clk_hw_register_divider(  in aspeed_adc_probe()
213 				&pdev->dev, "scaler", "prescaler",  in aspeed_adc_probe()
215 				data->base + ASPEED_REG_CLOCK_CONTROL,  in aspeed_adc_probe()
216 				0, 10, 0, &data->clk_lock);  in aspeed_adc_probe()
217 	if (IS_ERR(data->clk_scaler)) {  in aspeed_adc_probe()
218 		ret = PTR_ERR(data->clk_scaler);  in aspeed_adc_probe()
222 	data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);  in aspeed_adc_probe()
223 	if (IS_ERR(data->rst)) {  in aspeed_adc_probe()
224 		dev_err(&pdev->dev,  in aspeed_adc_probe()
226 		ret = PTR_ERR(data->rst);  in aspeed_adc_probe()
229 	reset_control_deassert(data->rst);  in aspeed_adc_probe()
231 	model_data = of_device_get_match_data(&pdev->dev);  in aspeed_adc_probe()
233 	if (model_data->wait_init_sequence) {  in aspeed_adc_probe()
236 		       data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
239 		ret = readl_poll_timeout(data->base + ASPEED_REG_ENGINE_CONTROL,  in aspeed_adc_probe()
250 	ret = clk_prepare_enable(data->clk_scaler->clk);  in aspeed_adc_probe()
257 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
259 	model_data = of_device_get_match_data(&pdev->dev);  in aspeed_adc_probe()
260 	indio_dev->name = model_data->model_name;  in aspeed_adc_probe()
261 	indio_dev->dev.parent = &pdev->dev;  in aspeed_adc_probe()
262 	indio_dev->info = &aspeed_adc_iio_info;  in aspeed_adc_probe()
263 	indio_dev->modes = INDIO_DIRECT_MODE;  in aspeed_adc_probe()
264 	indio_dev->channels = aspeed_adc_iio_channels;  in aspeed_adc_probe()
265 	indio_dev->num_channels = ARRAY_SIZE(aspeed_adc_iio_channels);  in aspeed_adc_probe()
275 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_probe()
276 	clk_disable_unprepare(data->clk_scaler->clk);  in aspeed_adc_probe()
279 	reset_control_assert(data->rst);  in aspeed_adc_probe()
281 	clk_hw_unregister_divider(data->clk_scaler);  in aspeed_adc_probe()
283 	clk_hw_unregister_divider(data->clk_prescaler);  in aspeed_adc_probe()
294 		data->base + ASPEED_REG_ENGINE_CONTROL);  in aspeed_adc_remove()
295 	clk_disable_unprepare(data->clk_scaler->clk);  in aspeed_adc_remove()
296 	reset_control_assert(data->rst);  in aspeed_adc_remove()
297 	clk_hw_unregister_divider(data->clk_scaler);  in aspeed_adc_remove()
298 	clk_hw_unregister_divider(data->clk_prescaler);  in aspeed_adc_remove()
304 	.model_name = "ast2400-adc",
311 	.model_name = "ast2500-adc",
319 	{ .compatible = "aspeed,ast2400-adc", .data = &ast2400_model_data },
320 	{ .compatible = "aspeed,ast2500-adc", .data = &ast2500_model_data },
337 MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver");