1 // SPDX-License-Identifier: GPL-2.0-only
19 /* STM32 VREFBUF registers */
22 /* STM32 VREFBUF CSR bitfields */
47 	ret = pm_runtime_get_sync(priv->dev);  in stm32_vrefbuf_enable()
49 		pm_runtime_put_noidle(priv->dev);  in stm32_vrefbuf_enable()
53 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
55 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
58 	 * Vrefbuf startup time depends on external capacitor: wait here for  in stm32_vrefbuf_enable()
63 	ret = readl_poll_timeout(priv->base + STM32_VREFBUF_CSR, val,  in stm32_vrefbuf_enable()
66 		dev_err(&rdev->dev, "stm32 vrefbuf timed out!\n");  in stm32_vrefbuf_enable()
67 		val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
69 		writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_enable()
72 	pm_runtime_mark_last_busy(priv->dev);  in stm32_vrefbuf_enable()
73 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_enable()
84 	ret = pm_runtime_get_sync(priv->dev);  in stm32_vrefbuf_disable()
86 		pm_runtime_put_noidle(priv->dev);  in stm32_vrefbuf_disable()
90 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_disable()
92 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_disable()
94 	pm_runtime_mark_last_busy(priv->dev);  in stm32_vrefbuf_disable()
95 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_disable()
105 	ret = pm_runtime_get_sync(priv->dev);  in stm32_vrefbuf_is_enabled()
107 		pm_runtime_put_noidle(priv->dev);  in stm32_vrefbuf_is_enabled()
111 	ret = readl_relaxed(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;  in stm32_vrefbuf_is_enabled()
113 	pm_runtime_mark_last_busy(priv->dev);  in stm32_vrefbuf_is_enabled()
114 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_is_enabled()
126 	ret = pm_runtime_get_sync(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
128 		pm_runtime_put_noidle(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
132 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_set_voltage_sel()
134 	writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_set_voltage_sel()
136 	pm_runtime_mark_last_busy(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
137 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_set_voltage_sel()
148 	ret = pm_runtime_get_sync(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
150 		pm_runtime_put_noidle(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
154 	val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);  in stm32_vrefbuf_get_voltage_sel()
157 	pm_runtime_mark_last_busy(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
158 	pm_runtime_put_autosuspend(priv->dev);  in stm32_vrefbuf_get_voltage_sel()
190 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in stm32_vrefbuf_probe()
192 		return -ENOMEM;  in stm32_vrefbuf_probe()
193 	priv->dev = &pdev->dev;  in stm32_vrefbuf_probe()
195 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in stm32_vrefbuf_probe()
196 	if (IS_ERR(priv->base))  in stm32_vrefbuf_probe()
197 		return PTR_ERR(priv->base);  in stm32_vrefbuf_probe()
199 	priv->clk = devm_clk_get(&pdev->dev, NULL);  in stm32_vrefbuf_probe()
200 	if (IS_ERR(priv->clk))  in stm32_vrefbuf_probe()
201 		return PTR_ERR(priv->clk);  in stm32_vrefbuf_probe()
203 	pm_runtime_get_noresume(&pdev->dev);  in stm32_vrefbuf_probe()
204 	pm_runtime_set_active(&pdev->dev);  in stm32_vrefbuf_probe()
205 	pm_runtime_set_autosuspend_delay(&pdev->dev,  in stm32_vrefbuf_probe()
207 	pm_runtime_use_autosuspend(&pdev->dev);  in stm32_vrefbuf_probe()
208 	pm_runtime_enable(&pdev->dev);  in stm32_vrefbuf_probe()
210 	ret = clk_prepare_enable(priv->clk);  in stm32_vrefbuf_probe()
212 		dev_err(&pdev->dev, "clk prepare failed with error %d\n", ret);  in stm32_vrefbuf_probe()
216 	config.dev = &pdev->dev;  in stm32_vrefbuf_probe()
218 	config.of_node = pdev->dev.of_node;  in stm32_vrefbuf_probe()
219 	config.init_data = of_get_regulator_init_data(&pdev->dev,  in stm32_vrefbuf_probe()
220 						      pdev->dev.of_node,  in stm32_vrefbuf_probe()
226 		dev_err(&pdev->dev, "register failed with error %d\n", ret);  in stm32_vrefbuf_probe()
231 	pm_runtime_mark_last_busy(&pdev->dev);  in stm32_vrefbuf_probe()
232 	pm_runtime_put_autosuspend(&pdev->dev);  in stm32_vrefbuf_probe()
237 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_probe()
239 	pm_runtime_disable(&pdev->dev);  in stm32_vrefbuf_probe()
240 	pm_runtime_set_suspended(&pdev->dev);  in stm32_vrefbuf_probe()
241 	pm_runtime_put_noidle(&pdev->dev);  in stm32_vrefbuf_probe()
251 	pm_runtime_get_sync(&pdev->dev);  in stm32_vrefbuf_remove()
253 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_remove()
254 	pm_runtime_disable(&pdev->dev);  in stm32_vrefbuf_remove()
255 	pm_runtime_set_suspended(&pdev->dev);  in stm32_vrefbuf_remove()
256 	pm_runtime_put_noidle(&pdev->dev);  in stm32_vrefbuf_remove()
266 	clk_disable_unprepare(priv->clk);  in stm32_vrefbuf_runtime_suspend()
276 	return clk_prepare_enable(priv->clk);  in stm32_vrefbuf_runtime_resume()
288 	{ .compatible = "st,stm32-vrefbuf", },
297 		.name  = "stm32-vrefbuf",
306 MODULE_DESCRIPTION("STMicroelectronics STM32 VREFBUF driver");
307 MODULE_ALIAS("platform:stm32-vrefbuf");