| Message ID | cover.1613031055.git.matti.vaittinen@fi.rohmeurope.com |
|---|---|
| Headers | show |
| Series | Support ROHM BD9576MUF and BD9573MUF PMICs | expand |
On Thu, 11 Feb 2021, Matti Vaittinen wrote: > BD9573 and BD9576 support set of "protection" interrupts for "fatal" > issues. Those lead to SOC reset as PMIC shuts the power outputs. Thus > there is no relevant IRQ handling for them. > > Few "detection" interrupts were added to the BD9576 with the idea that > SOC could take some recovery-action before error gets unrecoverable. > > Unfortunately the BD9576 interrupt logic was not re-evaluated. IRQs > are not designed to be properly acknowleged - and IRQ line is kept > active for whole duration of error condition (in comparison to > informing only about state change). > > For above reason, do not consider missing IRQ as error. > > Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> > --- > Changes since v7: > - Do not fail probe is BD9573 IRQ information is populated > - Comment clean-up/clarifications as suggested by Lee > > drivers/mfd/rohm-bd9576.c | 80 ++++++++++++++++++++++++++++++++- > include/linux/mfd/rohm-bd957x.h | 62 +++++++++++++++++++++++++ > 2 files changed, 141 insertions(+), 1 deletion(-) > > diff --git a/drivers/mfd/rohm-bd9576.c b/drivers/mfd/rohm-bd9576.c > index efd439677c9e..6084f9a0aa1c 100644 > --- a/drivers/mfd/rohm-bd9576.c > +++ b/drivers/mfd/rohm-bd9576.c > @@ -17,12 +17,27 @@ > #include <linux/regmap.h> > #include <linux/types.h> > > +/* > + * Due to the BD9576MUF nasty IRQ behaiour we don't always populate IRQs. > + * These will be added to regulator resources only if IRQ information for the > + * PMIC is populated in device-tree. > + */ > +static const struct resource bd9576_regulator_irqs[] = { > + DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"), > + DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"), > + DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"), > +}; > + > static struct mfd_cell bd9573_mfd_cells[] = { > { .name = "bd9573-regulator", }, > { .name = "bd9576-wdt", }, > }; > > static struct mfd_cell bd9576_mfd_cells[] = { > + /* > + * Please keep regulators as first cell as resources may be overwritten > + * from probe and the code expects regulators to be at index 0. > + */ Thought I'd mentioned this before (must have slipped my mind). This is not acceptable as it's much too fragile. Please use defined indexes to look into the array entries instead. [BD9576_REGULATOR] = { .name = "bd9576-regulator" } Etc. > { .name = "bd9576-regulator", }, > { .name = "bd9576-wdt", }, > }; > @@ -49,6 +64,29 @@ static struct regmap_config bd957x_regmap = { > .cache_type = REGCACHE_RBTREE, > }; > > +static struct regmap_irq bd9576_irqs[] = { > + REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM), > + REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP), > + REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP), > + REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP), > + REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD), > + REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD), > + REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP), > + REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS), > +}; > + > +static struct regmap_irq_chip bd9576_irq_chip = { > + .name = "bd9576_irq", > + .irqs = &bd9576_irqs[0], > + .num_irqs = ARRAY_SIZE(bd9576_irqs), > + .status_base = BD957X_REG_INT_MAIN_STAT, > + .mask_base = BD957X_REG_INT_MAIN_MASK, > + .ack_base = BD957X_REG_INT_MAIN_STAT, > + .init_ack_masked = true, > + .num_regs = 1, > + .irq_reg_stride = 1, > +}; > + > static int bd957x_i2c_probe(struct i2c_client *i2c, > const struct i2c_device_id *id) > { > @@ -57,6 +95,8 @@ static int bd957x_i2c_probe(struct i2c_client *i2c, > struct mfd_cell *cells; > int num_cells; > unsigned long chip_type; > + struct irq_domain *domain; > + bool usable_irqs; > > chip_type = (unsigned long)of_device_get_match_data(&i2c->dev); > > @@ -64,10 +104,16 @@ static int bd957x_i2c_probe(struct i2c_client *i2c, > case ROHM_CHIP_TYPE_BD9576: > cells = bd9576_mfd_cells; > num_cells = ARRAY_SIZE(bd9576_mfd_cells); > + usable_irqs = !!i2c->irq; > break; > case ROHM_CHIP_TYPE_BD9573: > cells = bd9573_mfd_cells; > num_cells = ARRAY_SIZE(bd9573_mfd_cells); > + /* > + * BD9573 only supports fatal IRQs which we can not handle > + * because SoC is going to lose the power. > + */ > + usable_irqs = false; > break; > default: > dev_err(&i2c->dev, "Unknown device type"); > @@ -79,9 +125,41 @@ static int bd957x_i2c_probe(struct i2c_client *i2c, > dev_err(&i2c->dev, "Failed to initialize Regmap\n"); > return PTR_ERR(regmap); > } Nit: '\n' > + /* > + * BD9576 behaves badly. It kepts IRQ line asserted for the whole > + * duration of detected HW condition (like over temperature). So we > + * don't require IRQ to be populated. > + * If IRQ information is not given, then we mask all IRQs and do not > + * provide IRQ resources to regulator driver - which then just omits > + * the notifiers. > + */ > + if (usable_irqs) { > + struct regmap_irq_chip_data *irq_data; > + struct mfd_cell *regulators = &bd9576_mfd_cells[0]; > + > + regulators->resources = bd9576_regulator_irqs; > + regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs); > + > + ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq, > + IRQF_ONESHOT, 0, > + &bd9576_irq_chip, &irq_data); > + if (ret) { > + dev_err(&i2c->dev, "Failed to add IRQ chip\n"); > + return ret; > + } > + domain = regmap_irq_get_domain(irq_data); > + dev_dbg(&i2c->dev, "Using IRQs for BD9576MUF\n"); Doesn't seem overly helpful. Please remove it. > + } else { > + ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK, > + BD957X_MASK_INT_ALL, > + BD957X_MASK_INT_ALL); > + if (ret) > + return ret; > + domain = NULL; > + } > > ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells, > - num_cells, NULL, 0, NULL); > + num_cells, NULL, 0, domain); > if (ret) > dev_err(&i2c->dev, "Failed to create subdevices\n"); > > diff --git a/include/linux/mfd/rohm-bd957x.h b/include/linux/mfd/rohm-bd957x.h > index ae59c0f7188d..3f351a1ae4ab 100644 > --- a/include/linux/mfd/rohm-bd957x.h > +++ b/include/linux/mfd/rohm-bd957x.h > @@ -13,6 +13,55 @@ enum { > BD957X_VOUTS1, > }; > > +/* > + * The BD9576 has own IRQ 'blocks' for: > + * - I2C/thermal, > + * - Over voltage protection > + * - Short-circuit protection > + * - Over current protection > + * - Over voltage detection > + * - Under voltage detection > + * - Under voltage protection > + * - 'system interrupt'. > + * > + * Each of the blocks have a status register giving more accurate IRQ source > + * information - for example which of the regulators have over-voltage. > + * > + * On top of this, there is "main IRQ" status register where each bit indicates > + * which of sub-blocks have active IRQs. Fine. That would fit regmap-irq main > + * status handling. Except that: > + * - Only some sub-IRQs can be masked. > + * - The IRQ informs us about fault-condition, not when fault state changes. > + * The IRQ line it is kept asserted until the detected condition is acked > + * AND cleared in HW. This is annoying for IRQs like the one informing high > + * temperature because if IRQ is not disabled it keeps the CPU in IRQ > + * handling loop. > + * > + * For now we do just use the main-IRQ register as source for our IRQ > + * information and bind the regmap-irq to this. We leave fine-grained sub-IRQ > + * register handling to handlers in sub-devices. The regulator driver shall > + * read which regulators are source for problem - or if the detected error is > + * regulator temperature error. The sub-drivers do also handle masking of "sub- > + * IRQs" if this is supported/needed. > + * > + * To overcome the problem with HW keeping IRQ asserted we do call > + * disable_irq_nosync() from sub-device handler and add a delayed work to > + * re-enable IRQ roughly 1 second later. This should keep our CPU out of > + * busy-loop. > + */ > +#define IRQS_SILENT_MS 1000 > + > +enum { > + BD9576_INT_THERM, > + BD9576_INT_OVP, > + BD9576_INT_SCP, > + BD9576_INT_OCP, > + BD9576_INT_OVD, > + BD9576_INT_UVD, > + BD9576_INT_UVP, > + BD9576_INT_SYS, > +}; > + > #define BD957X_REG_SMRB_ASSERT 0x15 > #define BD957X_REG_PMIC_INTERNAL_STAT 0x20 > #define BD957X_REG_INT_THERM_STAT 0x23 > @@ -28,6 +77,19 @@ enum { > #define BD957X_REG_INT_MAIN_STAT 0x30 > #define BD957X_REG_INT_MAIN_MASK 0x31 > > +#define UVD_IRQ_VALID_MASK 0x6F > +#define OVD_IRQ_VALID_MASK 0x2F > + > +#define BD957X_MASK_INT_MAIN_THERM BIT(0) > +#define BD957X_MASK_INT_MAIN_OVP BIT(1) > +#define BD957X_MASK_INT_MAIN_SCP BIT(2) > +#define BD957X_MASK_INT_MAIN_OCP BIT(3) > +#define BD957X_MASK_INT_MAIN_OVD BIT(4) > +#define BD957X_MASK_INT_MAIN_UVD BIT(5) > +#define BD957X_MASK_INT_MAIN_UVP BIT(6) > +#define BD957X_MASK_INT_MAIN_SYS BIT(7) > +#define BD957X_MASK_INT_ALL 0xff > + > #define BD957X_REG_WDT_CONF 0x16 > > #define BD957X_REG_POW_TRIGGER1 0x41 -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
Initial support for ROHM BD9576MUF and BD9573MUF PMICs. These PMICs are primarily intended to be used to power the R-Car family processors. BD9576MUF includes some additional safety features the BD9573MUF does not have. This initial version of drivers provides temperature, over voltage and under voltage warnings is IRQ information is passed via DT. This patch series includes MFD and watchdog drivers. Regulator part was already applied. This series brings in the IRQ support which will be utilized by the regulator driver(s). The regulator part was splitted in own series as it contains some changes to drivers which are not yet in other trees. WDG supports - Enabling and pinging the watchdog - configuring watchog timeout / window from device-tree Please note that not all of the boards are expected to be utilizing the warning IRQs. Thus populating the IRQ information from DT is optional. Changelog v8: - Drop regulator driver changes which are covered by the separate RFC series. - Renamed regulator driver cell. Regulator driver change will be brought in in the RFC series to avoid conflicts. - Add patch introducing register definitions required by the regulator RFC series. - Cleaned comments at MFD as was suggested by Lee - Do not abort MFD probe if IRQ information for BD9573 is populated - MFD driver/header styling Changelog v7: - Added interrupt handling - Added notifications and error_flag getter to regulators Changelog v6: - Fixed watchdog timeout Changelog v5: - rebased on top of v5.10-rc2 - few styling fixes in MFD as suggested by Lee Changelog v4: - rebased on top of 5.10-rc1 - Fix typo (repeated word maximum) from the DT binding doc Changelog v3: - use only one binding to specify watchdog time-out window. Changelog v2: - dropped already applied regulator part - dt_bindings: Fix case for regulator-names in the example - watchdod: unify probe error check and revise includes --- Matti Vaittinen (6): dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs mfd: Support ROHM BD9576MUF and BD9573MUF mfd: bd9576: Add IRQ support wdt: Support wdt on ROHM BD9576MUF and BD9573MUF MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers mfd: bd9576: Add safety limit/monitoring registers .../bindings/mfd/rohm,bd9576-pmic.yaml | 123 ++++++++ MAINTAINERS | 4 + drivers/mfd/Kconfig | 11 + drivers/mfd/Makefile | 1 + drivers/mfd/rohm-bd9576.c | 187 +++++++++++ drivers/watchdog/Kconfig | 13 + drivers/watchdog/Makefile | 1 + drivers/watchdog/bd9576_wdt.c | 291 ++++++++++++++++++ include/linux/mfd/rohm-bd957x.h | 140 +++++++++ include/linux/mfd/rohm-generic.h | 2 + 10 files changed, 773 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml create mode 100644 drivers/mfd/rohm-bd9576.c create mode 100644 drivers/watchdog/bd9576_wdt.c create mode 100644 include/linux/mfd/rohm-bd957x.h