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Message-ID: <20230303215936.GS2420672@google.com>
Date: Fri, 3 Mar 2023 21:59:36 +0000
From: Lee Jones <lee@...nel.org>
To: Julien Panis <jpanis@...libre.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
corbet@....net, hdegoede@...hat.com, eric.auger@...hat.com,
jgg@...pe.ca, razor@...ckwall.org, suma.hegde@....com,
stephen@...workplumber.org, arnd@...db.de,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, eblanc@...libre.com,
jneanne@...libre.com
Subject: Re: [PATCH v1 3/4] mfd: tps6594-esm: Add driver for TI TPS6594 ESM
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@...libre.com>
> ---
> 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@...libre.com>");
> +MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver");
> +MODULE_LICENSE("GPL");
> --
> 2.37.3
>
--
Lee Jones [李琼斯]
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