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Message-ID: <90a5b41b-84cd-4daa-b102-04a29c2cd46b@kernel.org> Date: Fri, 6 Sep 2024 11:44:54 +0200 From: Krzysztof Kozlowski <krzk@...nel.org> To: Junhao Xie <bigfoot@...ssfun.cn>, devicetree@...r.kernel.org, linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org, linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org, linux-watchdog@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, Sebastian Reichel <sre@...nel.org>, Alexandre Belloni <alexandre.belloni@...tlin.com>, Wim Van Sebroeck <wim@...ux-watchdog.org>, Heiko Stuebner <heiko@...ech.de>, Chukun Pan <amadeus@....edu.cn> Subject: Re: [PATCH 2/9] power: reset: add Photonicat PMU poweroff driver On 06/09/2024 11:36, Junhao Xie wrote: > This driver implements the shutdown function of Photonicat PMU: > > - Host notifies PMU to shutdown: > When powering off, a shutdown command (0x0F) needs to be sent > to the MCU. > > - PMU notifies host to shutdown: > If the power button is long pressed, the MCU will send a shutdown > command (0x0D) to the system. > If system does not shutdown within 60 seconds, > the power will be turned off directly. > > Signed-off-by: Junhao Xie <bigfoot@...ssfun.cn> > --- > drivers/power/reset/Kconfig | 12 +++ > drivers/power/reset/Makefile | 1 + > drivers/power/reset/photonicat-poweroff.c | 95 +++++++++++++++++++++++ > 3 files changed, 108 insertions(+) > create mode 100644 drivers/power/reset/photonicat-poweroff.c > > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig > index fece990af4a7..c59529ce25a2 100644 > --- a/drivers/power/reset/Kconfig > +++ b/drivers/power/reset/Kconfig > @@ -148,6 +148,18 @@ config POWER_RESET_ODROID_GO_ULTRA_POWEROFF > help > This driver supports Power off for Odroid Go Ultra device. > > +config POWER_RESET_PHOTONICAT_POWEROFF > + tristate "Photonicat PMU power-off driver" > + depends on MFD_PHOTONICAT_PMU || COMPILE_TEST, no? > + help > + This driver supports Power off for Photonicat PMU device. > + > + Supports operations: > + Host notifies PMU to shutdown > + PMU notifies host to shutdown > + > + Say Y if you have a Photonicat board. > + > config POWER_RESET_PIIX4_POWEROFF > tristate "Intel PIIX4 power-off driver" > depends on PCI > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile > index a95d1bd275d1..339b36812b95 100644 > --- a/drivers/power/reset/Makefile > +++ b/drivers/power/reset/Makefile > @@ -17,6 +17,7 @@ obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o > obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o > obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o > obj-$(CONFIG_POWER_RESET_ODROID_GO_ULTRA_POWEROFF) += odroid-go-ultra-poweroff.o > +obj-$(CONFIG_POWER_RESET_PHOTONICAT_POWEROFF) += photonicat-poweroff.o > obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o > obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o > obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o > diff --git a/drivers/power/reset/photonicat-poweroff.c b/drivers/power/reset/photonicat-poweroff.c > new file mode 100644 > index 000000000000..f9f1ea179247 > --- /dev/null > +++ b/drivers/power/reset/photonicat-poweroff.c > @@ -0,0 +1,95 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2024 Junhao Xie <bigfoot@...ssfun.cn> > + */ > + > +#include <linux/mfd/photonicat-pmu.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/reboot.h> > + > +struct pcat_poweroff { > + struct device *dev; > + struct pcat_pmu *pmu; > + struct notifier_block nb; > +}; > + > +static int pcat_do_poweroff(struct sys_off_data *data) > +{ > + struct pcat_poweroff *poweroff = data->cb_data; > + > + dev_info(poweroff->dev, "Host request PMU shutdown\n"); > + pcat_pmu_write_data(poweroff->pmu, PCAT_CMD_HOST_REQUEST_SHUTDOWN, > + NULL, 0); > + > + return NOTIFY_DONE; > +} > + > +static int pcat_poweroff_notify(struct notifier_block *nb, unsigned long action, > + void *data) > +{ > + struct pcat_poweroff *poweroff = > + container_of(nb, struct pcat_poweroff, nb); > + > + if (action != PCAT_CMD_PMU_REQUEST_SHUTDOWN) > + return NOTIFY_DONE; > + > + dev_info(poweroff->dev, "PMU request host shutdown\n"); Nope. Drop. > + orderly_poweroff(true); > + > + return NOTIFY_DONE; Best regards, Krzysztof
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