On Tue, 12 May 2015, S Twiss wrote: > From: Steve Twiss <stwiss.opensource@xxxxxxxxxxx> > > Add MFD support for the DA9063 OnKey driver > > The function da9063_clear_fault_log() is added to mitigate the case of a > hardware power-cut after a long-long OnKey press. Although there is no > software intervention in this case (by definition) such a shutdown would > cause persistent information within the DA9063 FAULT_LOG that would be > available during the next device restart. > > Clearance of this persistent register must be completed after such a > hardware power-cut operation has happened so that the FAULT_LOG does not > continue with previous values. The clearance function has been added here > in the kernel driver because wiping the fault-log cannot be counted on > outside the Linux kernel. > > > Signed-off-by: Steve Twiss <stwiss.opensource@xxxxxxxxxxx> > > --- > Version History > > Changes in V4 > - Additional description of MFD patch changes for FAULT_LOG in relation to > the requirements of the OnKey driver. Please see a further explanation of > the OnKey's operation in this thread: https://lkml.org/lkml/2015/4/29/406 > > Changes in V3 > - The MFD code was originally in [PATCH V2 1/2]. This is now been moved into > this patch [PATCH V3 3/3]. > - Whitespace cleanup > > This patch applies against linux-next and v4.1-rc3 > > > drivers/mfd/da9063-core.c | 54 ++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/da9063/pdata.h | 1 + > 2 files changed, 55 insertions(+) I'll wait to see what Dmitry has to say before applying, but for my own reference: Acked-by: Lee Jones <lee.jones@xxxxxxxxxx> > diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c > index facd361..af841c1 100644 > --- a/drivers/mfd/da9063-core.c > +++ b/drivers/mfd/da9063-core.c > @@ -60,6 +60,7 @@ static struct resource da9063_rtc_resources[] = { > > static struct resource da9063_onkey_resources[] = { > { > + .name = "ONKEY", > .start = DA9063_IRQ_ONKEY, > .end = DA9063_IRQ_ONKEY, > .flags = IORESOURCE_IRQ, > @@ -97,6 +98,7 @@ static const struct mfd_cell da9063_devs[] = { > .name = DA9063_DRVNAME_ONKEY, > .num_resources = ARRAY_SIZE(da9063_onkey_resources), > .resources = da9063_onkey_resources, > + .of_compatible = "dlg,da9063-onkey", > }, > { > .name = DA9063_DRVNAME_RTC, > @@ -109,12 +111,64 @@ static const struct mfd_cell da9063_devs[] = { > }, > }; > > +static int da9063_clear_fault_log(struct da9063 *da9063) > +{ > + int ret = 0; > + int fault_log = 0; > + > + ret = regmap_read(da9063->regmap, DA9063_REG_FAULT_LOG, &fault_log); > + if (ret < 0) { > + dev_err(da9063->dev, "Cannot read FAULT_LOG.\n"); > + return -EIO; > + } > + > + if (fault_log) { > + if (fault_log & DA9063_TWD_ERROR) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_TWD_ERROR\n"); > + if (fault_log & DA9063_POR) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_POR\n"); > + if (fault_log & DA9063_VDD_FAULT) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_VDD_FAULT\n"); > + if (fault_log & DA9063_VDD_START) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_VDD_START\n"); > + if (fault_log & DA9063_TEMP_CRIT) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_TEMP_CRIT\n"); > + if (fault_log & DA9063_KEY_RESET) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_KEY_RESET\n"); > + if (fault_log & DA9063_NSHUTDOWN) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_NSHUTDOWN\n"); > + if (fault_log & DA9063_WAIT_SHUT) > + dev_dbg(da9063->dev, > + "Fault log entry detected: DA9063_WAIT_SHUT\n"); > + } > + > + ret = regmap_write(da9063->regmap, > + DA9063_REG_FAULT_LOG, > + fault_log); > + if (ret < 0) > + dev_err(da9063->dev, > + "Cannot reset FAULT_LOG values %d\n", ret); > + > + return ret; > +} > + > int da9063_device_init(struct da9063 *da9063, unsigned int irq) > { > struct da9063_pdata *pdata = da9063->dev->platform_data; > int model, variant_id, variant_code; > int ret; > > + ret = da9063_clear_fault_log(da9063); > + if (ret < 0) > + dev_err(da9063->dev, "Cannot clear fault log\n"); > + > if (pdata) { > da9063->flags = pdata->flags; > da9063->irq_base = pdata->irq_base; > diff --git a/include/linux/mfd/da9063/pdata.h b/include/linux/mfd/da9063/pdata.h > index 95c8742..612383b 100644 > --- a/include/linux/mfd/da9063/pdata.h > +++ b/include/linux/mfd/da9063/pdata.h > @@ -103,6 +103,7 @@ struct da9063; > struct da9063_pdata { > int (*init)(struct da9063 *da9063); > int irq_base; > + bool key_power; > unsigned flags; > struct da9063_regulators_pdata *regulators_pdata; > struct led_platform_data *leds_pdata; -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
