On Thu, 16 Feb 2023, Julien Panis wrote: > This patch adds support for TPS6594 ESM (Error Signal Monitor). > This device monitors the SoC error output signal at its nERR_SOC input pin. > In error condition, ESM toggles its nRSTOUT_SOC pin to reset the SoC. This is not an MFD driver. Please move it somewhere more appropriate. > Signed-off-by: Julien Panis <jpanis@xxxxxxxxxxxx> > --- > drivers/mfd/Kconfig | 10 +++ > drivers/mfd/Makefile | 1 + > drivers/mfd/tps6594-esm.c | 132 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 143 insertions(+) > create mode 100644 drivers/mfd/tps6594-esm.c > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 3d2f5a10f54b..cbf7cfb70879 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1722,6 +1722,16 @@ config MFD_TPS6594_SPI > This driver can also be built as a module. If so, the module > will be called tps6594-spi. > > +config MFD_TPS6594_ESM > + tristate "TI TPS6594 Error Signal Monitor support" > + depends on MFD_TPS6594 > + help > + Support ESM (Error Signal Monitor) on TPS6594 PMIC devices. > + ESM is used typically to reboot the board in error condition. > + > + This driver can also be built as a module. If so, the module > + will be called tps6594-esm. > + > config TWL4030_CORE > bool "TI TWL4030/TWL5030/TWL6030/TPS659x0 Support" > depends on I2C=y > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index d2cba7326b07..ae2d404cd6b8 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -105,6 +105,7 @@ obj-$(CONFIG_MFD_TPS65912_SPI) += tps65912-spi.o > obj-$(CONFIG_MFD_TPS6594) += tps6594-core.o > obj-$(CONFIG_MFD_TPS6594_I2C) += tps6594-i2c.o > obj-$(CONFIG_MFD_TPS6594_SPI) += tps6594-spi.o > +obj-$(CONFIG_MFD_TPS6594_ESM) += tps6594-esm.o > obj-$(CONFIG_MENELAUS) += menelaus.o > > obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o > diff --git a/drivers/mfd/tps6594-esm.c b/drivers/mfd/tps6594-esm.c > new file mode 100644 > index 000000000000..db242b50846f > --- /dev/null > +++ b/drivers/mfd/tps6594-esm.c > @@ -0,0 +1,132 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * ESM (Error Signal Monitor) driver for TI TPS6594/TPS6593/LP8764X PMICs > + * > + * Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/ > + */ > + > +#include <linux/interrupt.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/regmap.h> > + > +#include <linux/mfd/tps6594.h> > + > +static irqreturn_t tps6594_esm_isr(int irq, void *dev_id) > +{ > + struct platform_device *pdev = dev_id; > + int i; > + > + for (i = 0 ; i < pdev->num_resources ; i++) { > + if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) { > + dev_err(pdev->dev.parent, "%s error detected\n", pdev->resource[i].name); > + return IRQ_HANDLED; > + } > + } > + > + return IRQ_NONE; > +} > + > +static int tps6594_esm_probe(struct platform_device *pdev) > +{ > + struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent); > + struct device *dev = &pdev->dev; > + int irq; > + int ret; > + int i; > + > + for (i = 0 ; i < pdev->num_resources ; i++) { > + irq = platform_get_irq_byname(pdev, pdev->resource[i].name); > + if (irq < 0) > + return dev_err_probe(dev, irq, "Failed to get %s irq\n", > + pdev->resource[i].name); > + > + ret = devm_request_threaded_irq(dev, irq, NULL, > + tps6594_esm_isr, IRQF_ONESHOT, > + pdev->resource[i].name, pdev); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to request irq\n"); > + } > + > + ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG, > + TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to configure ESM\n"); > + > + ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, > + TPS6594_BIT_ESM_SOC_START); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to start ESM\n"); > + > + pm_runtime_enable(dev); > + pm_runtime_get_sync(dev); > + > + return 0; > +} > + > +static int tps6594_esm_remove(struct platform_device *pdev) > +{ > + struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent); > + struct device *dev = &pdev->dev; > + int ret; > + > + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, > + TPS6594_BIT_ESM_SOC_START); > + if (ret) { > + dev_err(dev, "Failed to stop ESM\n"); > + goto out; > + } > + > + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG, > + TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV); > + if (ret) > + dev_err(dev, "Failed to unconfigure ESM\n"); > + > +out: > + pm_runtime_put_sync(dev); > + pm_runtime_disable(dev); > + > + return ret; > +} > + > +static int tps6594_esm_suspend(struct device *dev) > +{ > + struct tps6594 *tps = dev_get_drvdata(dev->parent); > + int ret; > + > + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, > + TPS6594_BIT_ESM_SOC_START); > + > + pm_runtime_put_sync(dev); > + > + return ret; > +} > + > +static int tps6594_esm_resume(struct device *dev) > +{ > + struct tps6594 *tps = dev_get_drvdata(dev->parent); > + > + pm_runtime_get_sync(dev); > + > + return regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, > + TPS6594_BIT_ESM_SOC_START); > +} > + > +static DEFINE_SIMPLE_DEV_PM_OPS(tps6594_esm_pm_ops, tps6594_esm_suspend, tps6594_esm_resume); > + > +static struct platform_driver tps6594_esm_driver = { > + .driver = { > + .name = "tps6594-esm", > + .pm = pm_sleep_ptr(&tps6594_esm_pm_ops), > + }, > + .probe = tps6594_esm_probe, > + .remove = tps6594_esm_remove, > +}; > + > +module_platform_driver(tps6594_esm_driver); > + > +MODULE_ALIAS("platform:tps6594-esm"); > +MODULE_AUTHOR("Julien Panis <jpanis@xxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver"); > +MODULE_LICENSE("GPL"); > -- > 2.37.3 > -- Lee Jones [李琼斯]
