Some da9063 chips can't use the watchdog as a restart means since the OTP does not set the AUTOBOOT bit [1]. So we need a new reset driver that implements a small i2c sequence that will allow to reset the boards that have this chip.
[1] https://www.dialog-semiconductor.com/products/pmics?post_id=10052#tab-support_tab_content Signed-off-by: Alexandre Ghiti <alexandre.gh...@canonical.com> --- drivers/power/pmic/da9063.c | 51 ++++++++++++++++++++++++++++++++++++- include/power/da9063_pmic.h | 1 + 2 files changed, 51 insertions(+), 1 deletion(-) diff --git a/drivers/power/pmic/da9063.c b/drivers/power/pmic/da9063.c index 25101d18f7..eb470e4255 100644 --- a/drivers/power/pmic/da9063.c +++ b/drivers/power/pmic/da9063.c @@ -10,6 +10,8 @@ #include <dm.h> #include <i2c.h> #include <log.h> +#include <sysreset.h> +#include <dm/lists.h> #include <power/pmic.h> #include <power/regulator.h> #include <power/da9063_pmic.h> @@ -85,8 +87,9 @@ static int da9063_read(struct udevice *dev, uint reg, uint8_t *buff, int len) static int da9063_bind(struct udevice *dev) { - ofnode regulators_node; + ofnode regulators_node, reset_node; int children; + int ret; regulators_node = dev_read_subnode(dev, "regulators"); if (!ofnode_valid(regulators_node)) { @@ -101,6 +104,17 @@ static int da9063_bind(struct udevice *dev) if (!children) debug("%s: %s - no child found\n", __func__, dev->name); + if (CONFIG_IS_ENABLED(SYSRESET)) { + reset_node = dev_read_subnode(dev, "reset"); + if (ofnode_valid(reset_node)) { + ret = device_bind_driver(dev, DA9063_SYSRESET_DRIVER, + DA9063_SYSRESET_DRIVER, NULL); + if (ret) + pr_err("%s: %s - failed to bind sysreset driver\n", + __func__, dev->name); + } + } + /* Always return success for this device */ return 0; } @@ -129,3 +143,38 @@ U_BOOT_DRIVER(pmic_da9063) = { .probe = da9063_probe, .ops = &da9063_ops, }; + +static int da9063_sysreset_request(struct udevice *dev, enum sysreset_t type) +{ + struct udevice *pmic_dev = dev->parent; + uint ret; + + if (type != SYSRESET_WARM && type != SYSRESET_COLD) + return -EPROTONOSUPPORT; + + ret = pmic_reg_write(pmic_dev, DA9063_REG_PAGE_CON, 0x00); + if (ret < 0) + return ret; + + /* Sets the WAKE_UP bit */ + ret = pmic_reg_write(pmic_dev, DA9063_REG_CONTROL_F, 0x04); + if (ret < 0) + return ret; + + /* Powerdown! */ + ret = pmic_reg_write(pmic_dev, DA9063_REG_CONTROL_A, 0x68); + if (ret < 0) + return ret; + + return -EINPROGRESS; +} + +static struct sysreset_ops da9063_sysreset_ops = { + .request = da9063_sysreset_request, +}; + +U_BOOT_DRIVER(da9063_sysreset) = { + .name = DA9063_SYSRESET_DRIVER, + .id = UCLASS_SYSRESET, + .ops = &da9063_sysreset_ops, +}; diff --git a/include/power/da9063_pmic.h b/include/power/da9063_pmic.h index 273a07ef41..1c676c242a 100644 --- a/include/power/da9063_pmic.h +++ b/include/power/da9063_pmic.h @@ -304,6 +304,7 @@ /* Drivers name */ #define DA9063_LDO_DRIVER "da9063_ldo" #define DA9063_BUCK_DRIVER "da9063_buck" +#define DA9063_SYSRESET_DRIVER "da9063_sysreset" /* Regulator modes */ enum { -- 2.30.2
