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Tue, 20 Oct 2026 07:03:35 -0700 (PDT) Received: from Aaron-M6 ([188.253.120.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea1502971csm12434865ad.51.2026.10.20.07.03.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 07:03:35 -0700 (PDT) From: Yaozhong Li To: Lee Jones Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Chris Zhong , Zhang Qing , Joseph Chen , Sebastian Reichel , mfd@lists.linux.dev, devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Yaozhong Li Subject: [PATCH v4 2/3] mfd: rk8xx: Release the power hold GPIOs before powering off Date: Tue, 20 Oct 2026 22:01:13 +0800 Message-ID: <20261020140127.720-3-yaozhonguwl@gmail.com> X-Mailer: git-send-email 2.55.0.windows.3 In-Reply-To: <20261020140127.720-1-yaozhonguwl@gmail.com> References: <20261020140127.720-1-yaozhonguwl@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit rk808_power_off() writes the PMIC's shutdown bit directly. On boards where lines driven by the SoC gate the PMIC's power-off path, a shutdown performed this way does not stick: the rails drop and immediately come back up, so the board restarts instead of staying off. U-Boot reports the result as a power-on reset. Take those lines as an optional GPIO array, hold them asserted while the system runs and release them - waiting power-hold-delay-ms - before writing the shutdown bit. Device trees without the property retain the existing behaviour. The array is claimed before any child device is registered, so that a -EPROBE_DEFER from the GPIO provider does not tear down the regulators, RTC and clocks that devm_mfd_add_devices() has already registered. On a Firefly-RK3399 the shutdown stuck when such a line went from high to low before the shutdown bit was written, and did not when the line was never driven. Assisted-by: LLM Signed-off-by: Yaozhong Li --- drivers/mfd/rk8xx-core.c | 49 +++++++++++++++++++++++++++++++++++++-- include/linux/mfd/rk808.h | 3 +++ 2 files changed, 50 insertions(+), 2 deletions(-) diff --git a/drivers/mfd/rk8xx-core.c b/drivers/mfd/rk8xx-core.c index 3dcf6ab..137ab20 100644 --- a/drivers/mfd/rk8xx-core.c +++ b/drivers/mfd/rk8xx-core.c @@ -11,6 +11,8 @@ */ #include +#include +#include #include #include #include @@ -703,6 +705,22 @@ static int rk808_power_off(struct sys_off_data *data) default: return NOTIFY_DONE; } + + /* + * Some boards route "power hold" lines from the SoC into the board's + * power circuitry. They have to be held asserted while the system is + * running and released before the PMIC shutdown request is written, + * otherwise the rails can drop and come back up instead of staying + * off. Releasing them here rather than from a separate handler keeps + * the ordering against the I2C write explicit. + */ + if (rk808->power_hold_gpios) { + for (unsigned int line = 0; line < rk808->power_hold_gpios->ndescs; line++) + gpiod_set_value_cansleep(rk808->power_hold_gpios->desc[line], 0); + + msleep(rk808->power_hold_delay_ms); + } + ret = regmap_update_bits(rk808->regmap, reg, bit, bit); if (ret) dev_err(rk808->dev, "Failed to shutdown device!\n"); @@ -766,6 +784,7 @@ int rk8xx_probe(struct device *dev, int variant, unsigned int irq, struct regmap struct rk808 *rk808; const struct rk808_reg_data *pre_init_reg; const struct mfd_cell *cells; + bool system_power_controller; int dual_support = 0; int nr_pre_init_regs; u32 rst_fun = 0; @@ -851,6 +870,33 @@ int rk8xx_probe(struct device *dev, int variant, unsigned int irq, struct regmap if (!irq) return dev_err_probe(dev, -EINVAL, "No interrupt support, no core IRQ\n"); + system_power_controller = + device_property_read_bool(dev, "system-power-controller") || + device_property_read_bool(dev, "rockchip,system-power-controller"); + + /* + * Claim the optional power hold GPIOs before any child device is + * registered. A -EPROBE_DEFER from the GPIO provider at this point + * costs nothing, whereas deferring after devm_mfd_add_devices() + * would tear the freshly registered children down again on every + * retry. + */ + if (system_power_controller) { + rk808->power_hold_gpios = devm_gpiod_get_array_optional(dev, "power-hold", + GPIOD_OUT_HIGH); + if (IS_ERR(rk808->power_hold_gpios)) + return dev_err_probe(dev, PTR_ERR(rk808->power_hold_gpios), + "Failed to get power hold GPIOs\n"); + + /* + * The settle time is optional. rk808 is zero initialised and + * the binding documents 0 as the default, so an absent property + * means the shutdown request follows the release with no wait. + */ + device_property_read_u32(dev, "power-hold-delay-ms", + &rk808->power_hold_delay_ms); + } + ret = devm_regmap_add_irq_chip(dev, rk808->regmap, irq, IRQF_ONESHOT | dual_support, -1, rk808->regmap_irq_chip, &rk808->irq_data); @@ -872,8 +918,7 @@ int rk8xx_probe(struct device *dev, int variant, unsigned int irq, struct regmap if (ret) return dev_err_probe(dev, ret, "failed to add MFD devices\n"); - if (device_property_read_bool(dev, "system-power-controller") || - device_property_read_bool(dev, "rockchip,system-power-controller")) { + if (system_power_controller) { ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_POWER_OFF_PREPARE, SYS_OFF_PRIO_HIGH, &rk808_power_off, rk808); diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h index 7ffc904..e56d595 100644 --- a/include/linux/mfd/rk808.h +++ b/include/linux/mfd/rk808.h @@ -15,6 +15,7 @@ #ifndef __LINUX_REGULATOR_RK808_H #define __LINUX_REGULATOR_RK808_H +#include #include #include @@ -1466,6 +1467,8 @@ struct rk808 { long variant; const struct regmap_config *regmap_cfg; const struct regmap_irq_chip *regmap_irq_chip; + struct gpio_descs *power_hold_gpios; + u32 power_hold_delay_ms; }; void rk8xx_shutdown(struct device *dev); -- 2.55.0.windows.3