1 // SPDX-License-Identifier: GPL-2.0-only
19 /* STM32 VREFBUF registers */
22 /* STM32 VREFBUF CSR bitfields */
47 	ret = pm_runtime_resume_and_get(priv->dev);  in stm32_vrefbuf_enable()
51 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
53 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
56 	 * Vrefbuf startup time depends on external capacitor: wait here for  in stm32_vrefbuf_enable()
61 	ret = readl_poll_timeout(priv->base + STM32_VREFBUF_CSR, val,  in stm32_vrefbuf_enable()
64 		dev_err(&rdev->dev, "stm32 vrefbuf timed out!\n");  in stm32_vrefbuf_enable()
65 		val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
67 		writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
70 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_enable()
81 	ret = pm_runtime_resume_and_get(priv->dev);  in stm32_vrefbuf_disable()
85 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_disable()
87 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_disable()
89 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_disable()
99 	ret = pm_runtime_resume_and_get(priv->dev);  in stm32_vrefbuf_is_enabled()
103 	ret = readl_relaxed(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;  in stm32_vrefbuf_is_enabled()
105 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_is_enabled()
117 	ret = pm_runtime_resume_and_get(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
121 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_set_voltage_sel()
123 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_set_voltage_sel()
125 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
136 	ret = pm_runtime_resume_and_get(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
140 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_get_voltage_sel()
143 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
175 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in stm32_vrefbuf_probe()
177 		return -ENOMEM;  in stm32_vrefbuf_probe()
178 	priv->dev = &pdev->dev;  in stm32_vrefbuf_probe()
180 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in stm32_vrefbuf_probe()
181 	if (IS_ERR(priv->base))  in stm32_vrefbuf_probe()
182 		return PTR_ERR(priv->base);  in stm32_vrefbuf_probe()
184 	priv->clk = devm_clk_get(&pdev->dev, NULL);  in stm32_vrefbuf_probe()
185 	if (IS_ERR(priv->clk))  in stm32_vrefbuf_probe()
186 		return PTR_ERR(priv->clk);  in stm32_vrefbuf_probe()
188 	pm_runtime_get_noresume(&pdev->dev);  in stm32_vrefbuf_probe()
189 	pm_runtime_set_active(&pdev->dev);  in stm32_vrefbuf_probe()
190 	pm_runtime_set_autosuspend_delay(&pdev->dev,  in stm32_vrefbuf_probe()
192 	pm_runtime_use_autosuspend(&pdev->dev);  in stm32_vrefbuf_probe()
193 	pm_runtime_enable(&pdev->dev);  in stm32_vrefbuf_probe()
195 	ret = clk_prepare_enable(priv->clk);  in stm32_vrefbuf_probe()
197 		dev_err(&pdev->dev, "clk prepare failed with error %d\n", ret);  in stm32_vrefbuf_probe()
201 	config.dev = &pdev->dev;  in stm32_vrefbuf_probe()
203 	config.of_node = pdev->dev.of_node;  in stm32_vrefbuf_probe()
204 	config.init_data = of_get_regulator_init_data(&pdev->dev,  in stm32_vrefbuf_probe()
205 						      pdev->dev.of_node,  in stm32_vrefbuf_probe()
208 	rdev = regulator_register(&pdev->dev, &stm32_vrefbuf_regu, &config);  in stm32_vrefbuf_probe()
211 		dev_err(&pdev->dev, "register failed with error %d\n", ret);  in stm32_vrefbuf_probe()
216 	pm_runtime_put_autosuspend(&pdev->dev);  in stm32_vrefbuf_probe()
221 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_probe()
223 	pm_runtime_disable(&pdev->dev);  in stm32_vrefbuf_probe()
224 	pm_runtime_set_suspended(&pdev->dev);  in stm32_vrefbuf_probe()
225 	pm_runtime_put_noidle(&pdev->dev);  in stm32_vrefbuf_probe()
235 	pm_runtime_get_sync(&pdev->dev);  in stm32_vrefbuf_remove()
237 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_remove()
238 	pm_runtime_disable(&pdev->dev);  in stm32_vrefbuf_remove()
239 	pm_runtime_set_suspended(&pdev->dev);  in stm32_vrefbuf_remove()
240 	pm_runtime_put_noidle(&pdev->dev);  in stm32_vrefbuf_remove()
248 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_runtime_suspend()
258 	return clk_prepare_enable(priv->clk);  in stm32_vrefbuf_runtime_resume()
270 	{ .compatible = "st,stm32-vrefbuf", },
279 		.name  = "stm32-vrefbuf",
289 MODULE_DESCRIPTION("STMicroelectronics STM32 VREFBUF driver");
290 MODULE_ALIAS("platform:stm32-vrefbuf");