regulator: stm32-vrefbuf: add power management support
Add support for suspend/resume and runtime PM to stm32-vrefbuf driver. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Fabrice Gasnier
Mark Brown
Родитель
0e819b51fb
Коммит
be5295f8a1
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@ -15,6 +15,7 @@
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/pm_runtime.h>
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/* STM32 VREFBUF registers */
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#define STM32_VREFBUF_CSR 0x00
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@ -25,9 +26,12 @@
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#define STM32_HIZ BIT(1)
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#define STM32_ENVR BIT(0)
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#define STM32_VREFBUF_AUTO_SUSPEND_DELAY_MS 10
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struct stm32_vrefbuf {
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void __iomem *base;
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struct clk *clk;
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struct device *dev;
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};
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static const unsigned int stm32_vrefbuf_voltages[] = {
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@ -38,9 +42,16 @@ static const unsigned int stm32_vrefbuf_voltages[] = {
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static int stm32_vrefbuf_enable(struct regulator_dev *rdev)
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{
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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u32 val;
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int ret;
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ret = pm_runtime_get_sync(priv->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(priv->dev);
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return ret;
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}
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val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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val = (val & ~STM32_HIZ) | STM32_ENVR;
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writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
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@ -59,45 +70,95 @@ static int stm32_vrefbuf_enable(struct regulator_dev *rdev)
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writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
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}
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pm_runtime_mark_last_busy(priv->dev);
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pm_runtime_put_autosuspend(priv->dev);
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return ret;
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}
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static int stm32_vrefbuf_disable(struct regulator_dev *rdev)
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{
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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u32 val;
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int ret;
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ret = pm_runtime_get_sync(priv->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(priv->dev);
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return ret;
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}
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val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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val = (val & ~STM32_ENVR) | STM32_HIZ;
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writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
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pm_runtime_mark_last_busy(priv->dev);
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pm_runtime_put_autosuspend(priv->dev);
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return 0;
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}
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static int stm32_vrefbuf_is_enabled(struct regulator_dev *rdev)
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{
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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int ret;
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return readl_relaxed(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;
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ret = pm_runtime_get_sync(priv->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(priv->dev);
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return ret;
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}
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ret = readl_relaxed(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;
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pm_runtime_mark_last_busy(priv->dev);
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pm_runtime_put_autosuspend(priv->dev);
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return ret;
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}
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static int stm32_vrefbuf_set_voltage_sel(struct regulator_dev *rdev,
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unsigned sel)
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{
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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u32 val;
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int ret;
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ret = pm_runtime_get_sync(priv->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(priv->dev);
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return ret;
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}
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val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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val = (val & ~STM32_VRS) | FIELD_PREP(STM32_VRS, sel);
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writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
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pm_runtime_mark_last_busy(priv->dev);
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pm_runtime_put_autosuspend(priv->dev);
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return 0;
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}
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static int stm32_vrefbuf_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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u32 val;
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int ret;
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return FIELD_GET(STM32_VRS, val);
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ret = pm_runtime_get_sync(priv->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(priv->dev);
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return ret;
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}
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val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
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ret = FIELD_GET(STM32_VRS, val);
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pm_runtime_mark_last_busy(priv->dev);
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pm_runtime_put_autosuspend(priv->dev);
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return ret;
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}
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static const struct regulator_ops stm32_vrefbuf_volt_ops = {
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@ -130,6 +191,7 @@ static int stm32_vrefbuf_probe(struct platform_device *pdev)
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = &pdev->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(&pdev->dev, res);
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@ -140,10 +202,17 @@ static int stm32_vrefbuf_probe(struct platform_device *pdev)
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if (IS_ERR(priv->clk))
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return PTR_ERR(priv->clk);
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_set_autosuspend_delay(&pdev->dev,
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STM32_VREFBUF_AUTO_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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ret = clk_prepare_enable(priv->clk);
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if (ret) {
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dev_err(&pdev->dev, "clk prepare failed with error %d\n", ret);
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return ret;
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goto err_pm_stop;
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}
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config.dev = &pdev->dev;
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@ -161,10 +230,17 @@ static int stm32_vrefbuf_probe(struct platform_device *pdev)
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}
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platform_set_drvdata(pdev, rdev);
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pm_runtime_mark_last_busy(&pdev->dev);
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pm_runtime_put_autosuspend(&pdev->dev);
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return 0;
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err_clk_dis:
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clk_disable_unprepare(priv->clk);
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err_pm_stop:
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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return ret;
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}
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@ -174,10 +250,40 @@ static int stm32_vrefbuf_remove(struct platform_device *pdev)
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struct regulator_dev *rdev = platform_get_drvdata(pdev);
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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pm_runtime_get_sync(&pdev->dev);
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regulator_unregister(rdev);
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clk_disable_unprepare(priv->clk);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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};
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static int __maybe_unused stm32_vrefbuf_runtime_suspend(struct device *dev)
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{
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struct regulator_dev *rdev = dev_get_drvdata(dev);
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static int __maybe_unused stm32_vrefbuf_runtime_resume(struct device *dev)
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{
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struct regulator_dev *rdev = dev_get_drvdata(dev);
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struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
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return clk_prepare_enable(priv->clk);
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}
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static const struct dev_pm_ops stm32_vrefbuf_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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SET_RUNTIME_PM_OPS(stm32_vrefbuf_runtime_suspend,
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stm32_vrefbuf_runtime_resume,
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NULL)
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};
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static const struct of_device_id stm32_vrefbuf_of_match[] = {
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@ -192,6 +298,7 @@ static struct platform_driver stm32_vrefbuf_driver = {
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.driver = {
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.name = "stm32-vrefbuf",
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.of_match_table = of_match_ptr(stm32_vrefbuf_of_match),
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.pm = &stm32_vrefbuf_pm_ops,
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},
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};
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module_platform_driver(stm32_vrefbuf_driver);
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