power/regulator/stm32-vrefbuf.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
6  * Originally based on the Linux kernel v4.16 drivers/regulator/stm32-vrefbuf.c
17 /* STM32 VREFBUF registers */
20 /* STM32 VREFBUF CSR bitfields */
44 	clrsetbits_le32(priv->base + STM32_VREFBUF_CSR, STM32_HIZ | STM32_ENVR,  in stm32_vrefbuf_set_enable()
50 	 * Vrefbuf startup time depends on external capacitor: wait here for  in stm32_vrefbuf_set_enable()
55 	ret = readl_poll_timeout(priv->base + STM32_VREFBUF_CSR, val,  in stm32_vrefbuf_set_enable()
58 		dev_err(dev, "stm32 vrefbuf timed out: %d\n", ret);  in stm32_vrefbuf_set_enable()
59 		clrsetbits_le32(priv->base + STM32_VREFBUF_CSR, STM32_ENVR,  in stm32_vrefbuf_set_enable()
71 	return readl(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;  in stm32_vrefbuf_get_enable()
81 			clrsetbits_le32(priv->base + STM32_VREFBUF_CSR,  in stm32_vrefbuf_set_value()
87 	return -EINVAL;  in stm32_vrefbuf_set_value()
95 	val = readl(priv->base + STM32_VREFBUF_CSR) & STM32_VRS;  in stm32_vrefbuf_get_value()
113 	priv->base = dev_read_addr_ptr(dev);  in stm32_vrefbuf_probe()
115 	ret = clk_get_by_index(dev, 0, &priv->clk);  in stm32_vrefbuf_probe()
121 	ret = clk_enable(&priv->clk);  in stm32_vrefbuf_probe()
127 	ret = device_get_supply_regulator(dev, "vdda-supply",  in stm32_vrefbuf_probe()
128 					  &priv->vdda_supply);  in stm32_vrefbuf_probe()
130 		dev_dbg(dev, "No vdda-supply: %d\n", ret);  in stm32_vrefbuf_probe()
134 	ret = regulator_set_enable(priv->vdda_supply, true);  in stm32_vrefbuf_probe()
136 		dev_err(dev, "Can't enable vdda-supply: %d\n", ret);  in stm32_vrefbuf_probe()
137 		clk_disable(&priv->clk);  in stm32_vrefbuf_probe()
144 	{ .compatible = "st,stm32-vrefbuf" },
149 	.name  = "stm32-vrefbuf",