Date:   Mon, 24 Aug 2020 16:41:13 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Cristian Ciocaltea <cristian.ciocaltea@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andreas Färber <afaerber@...e.de>,
        linux-actions@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 4/6] power: reset: Add poweroff driver for ATC260x
 PMICs

Hi,

On Sat, Aug 22, 2020 at 01:19:50AM +0300, Cristian Ciocaltea wrote:
> This driver provides poweroff and reboot support for a system through
> the ATC2603C and ATC2609A chip variants of the Actions Semi ATC260x
> family of PMICs.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> ---
>  drivers/power/reset/Kconfig            |   8 +-
>  drivers/power/reset/Makefile           |   1 +
>  drivers/power/reset/atc260x-poweroff.c | 274 +++++++++++++++++++++++++
>  3 files changed, 282 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/power/reset/atc260x-poweroff.c
> 
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index 0a1fb5c74f83..df6c3676b892 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -39,6 +39,13 @@ config POWER_RESET_AT91_SAMA5D2_SHDWC
>  	  This driver supports the alternate shutdown controller for some Atmel
>  	  SAMA5 SoCs. It is present for example on SAMA5D2 SoC.
>  
> +config POWER_RESET_ATC260X
> +	tristate "Actions Semi ATC260x PMIC power-off driver"
> +	depends on MFD_ATC260X
> +	help
> +	  This driver provides power-off and restart support for a system
> +	  through Actions Semi ATC260x series PMICs.
> +
>  config POWER_RESET_AXXIA
>  	bool "LSI Axxia reset driver"
>  	depends on ARCH_AXXIA
> @@ -285,4 +292,3 @@ config NVMEM_REBOOT_MODE
>  	  action according to the mode.
>  
>  endif
> -
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index c51eceba9ea3..829df1157540 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
>  obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o
>  obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o
>  obj-$(CONFIG_POWER_RESET_AT91_SAMA5D2_SHDWC) += at91-sama5d2_shdwc.o
> +obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o
>  obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
>  obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o
>  obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
> diff --git a/drivers/power/reset/atc260x-poweroff.c b/drivers/power/reset/atc260x-poweroff.c
> new file mode 100644
> index 000000000000..81a99e7e4a91
> --- /dev/null
> +++ b/drivers/power/reset/atc260x-poweroff.c
> @@ -0,0 +1,274 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Poweroff & reset driver for Actions Semi ATC260x PMICs
> + *
> + * Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/mfd/atc260x/core.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/reboot.h>
> +#include <linux/regmap.h>
> +
> +struct atc260x_pwrc {
> +	struct device *dev;
> +	struct regmap *regmap;
> +	struct notifier_block restart_nb;
> +	int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);
> +};
> +
> +/* Global variable needed only for pm_power_off */
> +static struct atc260x_pwrc *atc260x_pwrc_data;
> +
> +static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
> +{
> +	int ret, deep_sleep = 0;
> +	uint reg_mask, reg_val;
> +
> +	/* S4-Deep Sleep Mode is NOT available for WALL/USB power */
> +	if (!restart && !power_supply_is_system_supplied()) {
> +		deep_sleep = 1;
> +		dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
> +	}
> +
> +	/* Update wakeup sources */
> +	reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
> +		  (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN
> +			   : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
> +
> +	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
> +				 ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);
> +	if (ret)
> +		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
> +
> +	/* Update power mode */
> +	reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;
> +
> +	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,
> +				 deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);
> +	if (ret) {
> +		dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* Trigger poweroff / restart sequence */
> +	reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN
> +			   : ATC2603C_PMU_SYS_CTL1_EN_S1;
> +	reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
> +
> +	ret = regmap_update_bits(pwrc->regmap,
> +				 restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
> +				 reg_mask, reg_val);
> +	if (ret) {
> +		dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
> +			restart ? 0 : 1, ret);
> +		return ret;
> +	}
> +
> +	/* Wait for trigger completion */
> +	mdelay(200);
> +
> +	return 0;
> +}
> +
> +static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
> +{
> +	int ret, deep_sleep = 0;
> +	uint reg_mask, reg_val;
> +
> +	/* S4-Deep Sleep Mode is NOT available for WALL/USB power */
> +	if (!restart && !power_supply_is_system_supplied()) {
> +		deep_sleep = 1;
> +		dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
> +	}
> +
> +	/* Update wakeup sources */
> +	reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
> +		  (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN
> +			   : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
> +
> +	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
> +				 ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);
> +	if (ret)
> +		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
> +
> +	/* Update power mode */
> +	reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;
> +
> +	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,
> +				 deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);
> +	if (ret) {
> +		dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* Trigger poweroff / restart sequence */
> +	reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN
> +			   : ATC2609A_PMU_SYS_CTL1_EN_S1;
> +	reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
> +
> +	ret = regmap_update_bits(pwrc->regmap,
> +				 restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
> +				 reg_mask, reg_val);
> +	if (ret) {
> +		dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
> +			restart ? 0 : 1, ret);
> +		return ret;
> +	}
> +
> +	/* Wait for trigger completion */
> +	mdelay(200);
> +
> +	return 0;
> +}
> +
> +static int atc2603c_init(const struct atc260x_pwrc *pwrc)
> +{
> +	int ret;
> +
> +	/*
> +	 * Delay transition from S2/S3 to S1 in order to avoid
> +	 * DDR init failure in Bootloader.
> +	 */
> +	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,
> +				 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,
> +				 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);
> +	if (ret)
> +		dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
> +
> +	/* Set wakeup sources */
> +	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
> +				 ATC2603C_PMU_SYS_CTL0_WK_ALL,
> +				 ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |
> +				 ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
> +	if (ret)
> +		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int atc2609a_init(const struct atc260x_pwrc *pwrc)
> +{
> +	int ret;
> +
> +	/* Set wakeup sources */
> +	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
> +				 ATC2609A_PMU_SYS_CTL0_WK_ALL,
> +				 ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |
> +				 ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
> +	if (ret)
> +		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static void atc260x_pwrc_pm_handler(void)
> +{
> +	atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);
> +
> +	WARN_ONCE(1, "Unable to power off system\n");
> +}
> +
> +static int atc260x_pwrc_restart_handler(struct notifier_block *nb,
> +					unsigned long mode, void *cmd)
> +{
> +	struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,
> +						 restart_nb);
> +	pwrc->do_poweroff(pwrc, true);
> +
> +	return NOTIFY_DONE;
> +}
> +
> +static int atc260x_pwrc_probe(struct platform_device *pdev)
> +{
> +	struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);
> +	struct atc260x_pwrc *priv;
> +	int ret;
> +
> +	if (!pdev->dev.of_node)
> +		return -ENXIO;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->dev = &pdev->dev;
> +	priv->regmap = atc260x->regmap;
> +	priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;
> +	priv->restart_nb.priority = 192;
> +
> +	switch (atc260x->ic_type) {
> +	case ATC2603C:
> +		priv->do_poweroff = atc2603c_do_poweroff;
> +		ret = atc2603c_init(priv);
> +		break;
> +	case ATC2609A:
> +		priv->do_poweroff = atc2609a_do_poweroff;
> +		ret = atc2609a_init(priv);
> +		break;
> +	default:
> +		dev_err(priv->dev,
> +			"Poweroff not supported for ATC260x PMIC type: %u\n",
> +			atc260x->ic_type);
> +		return -EINVAL;
> +	}
> +
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	if (!pm_power_off) {
> +		atc260x_pwrc_data = priv;
> +		pm_power_off = atc260x_pwrc_pm_handler;
> +	} else {
> +		dev_warn(priv->dev, "Poweroff callback already assigned\n");
> +	}
> +
> +	ret = register_restart_handler(&priv->restart_nb);
> +	if (ret)
> +		dev_err(priv->dev, "failed to register restart handler: %d\n",
> +			ret);
> +
> +	return ret;
> +}
> +
> +static int atc260x_pwrc_remove(struct platform_device *pdev)
> +{
> +	struct atc260x_pwrc *priv = platform_get_drvdata(pdev);
> +
> +	if (atc260x_pwrc_data == priv) {
> +		pm_power_off = NULL;
> +		atc260x_pwrc_data = NULL;
> +	}
> +
> +	unregister_restart_handler(&priv->restart_nb);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id atc260x_pwrc_of_match[] = {
> +	{ .compatible = "actions,atc2603c-pwrc" },
> +	{ .compatible = "actions,atc2609a-pwrc" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, atc260x_pwrc_of_match);
> +
> +static struct platform_driver atc260x_pwrc_driver = {
> +	.probe = atc260x_pwrc_probe,
> +	.remove = atc260x_pwrc_remove,
> +	.driver = {
> +		.name = "atc260x-pwrc",
> +		.of_match_table = of_match_ptr(atc260x_pwrc_of_match),

drop of_match_ptr() and directly use atc260x_pwrc_of_match. Current
code would throw unused warning for atc260x_pwrc_of_match when OF is
disabled.

> +	},
> +};
> +
> +module_platform_driver(atc260x_pwrc_driver);
> +
> +MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");
> +MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@...il.com>");
> +MODULE_LICENSE("GPL");

Otherwise LGTM,

-- Sebastian

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