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[2.7.60.249]) by smtp.gmail.com with ESMTPSA id j27sm1447809wms.6.2021.09.20.22.33.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Sep 2021 22:33:57 -0700 (PDT) From: Alexandre Ghiti To: Support Opensource , Lee Jones , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH] drivers: mfd: da9063: Add restart notifier implementation Date: Tue, 21 Sep 2021 07:33:56 +0200 Message-Id: <20210921053356.1705833-1-alexandre.ghiti@canonical.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210920_223403_346588_11312DAC X-CRM114-Status: GOOD ( 14.73 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The SiFive Unmatched board uses the da9063 PMIC for reset: add a restart notifier that will execute a small i2c sequence allowing to reset the board. The original implementation comes from Marcus Comstedt and Anders Montonen (https://forums.sifive.com/t/reboot-command/4721/28). Signed-off-by: Alexandre Ghiti --- drivers/mfd/da9063-core.c | 25 +++++++++++++++++++++++++ include/linux/mfd/da9063/core.h | 3 +++ 2 files changed, 28 insertions(+) diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c index df407c3afce3..c87b8d611f20 100644 --- a/drivers/mfd/da9063-core.c +++ b/drivers/mfd/da9063-core.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -158,6 +159,18 @@ static int da9063_clear_fault_log(struct da9063 *da9063) return ret; } +static int da9063_restart_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct da9063 *da9063 = container_of(this, struct da9063, restart_handler); + + regmap_write(da9063->regmap, DA9063_REG_PAGE_CON, 0x00); + regmap_write(da9063->regmap, DA9063_REG_CONTROL_F, 0x04); + regmap_write(da9063->regmap, DA9063_REG_CONTROL_A, 0x68); + + return NOTIFY_DONE; +} + int da9063_device_init(struct da9063 *da9063, unsigned int irq) { int ret; @@ -197,6 +210,18 @@ int da9063_device_init(struct da9063 *da9063, unsigned int irq) } } + da9063->restart_handler.notifier_call = da9063_restart_notify; + da9063->restart_handler.priority = 128; + ret = register_restart_handler(&da9063->restart_handler); + if (ret) { + dev_err(da9063->dev, "Failed to register restart handler\n"); + return ret; + } + + devm_add_action(da9063->dev, + (void (*)(void *))unregister_restart_handler, + &da9063->restart_handler); + return ret; } diff --git a/include/linux/mfd/da9063/core.h b/include/linux/mfd/da9063/core.h index fa7a43f02f27..1b20c498e340 100644 --- a/include/linux/mfd/da9063/core.h +++ b/include/linux/mfd/da9063/core.h @@ -85,6 +85,9 @@ struct da9063 { int chip_irq; unsigned int irq_base; struct regmap_irq_chip_data *regmap_irq; + + /* Restart */ + struct notifier_block restart_handler; }; int da9063_device_init(struct da9063 *da9063, unsigned int irq);