Hi Krzysztof, On 3 August 2015 at 18:07, Krzysztof Kozlowski <k.kozlowski.k@xxxxxxxxx> wrote: > On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1 > register must be manually set to 0 before initiating power off sequence. > > One of usual power down methods for Exynos based devices looks like: > 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos. > 2. Exynos holds up this pin during system operation. > 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in > other device. > 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if > ACOKB goes high. > > On Odroid XU3 family the difference is in (3) - the ACOKB is grounded. > This means that PMIC must manually set PWRHOLD field to low and then > wait for signal from Application Processor (the usual change in > PWRHOLD/PSHOLD pin will actually cut off the power). > > The patch adds respective binding allowing Odroid XU3 device to be > powered off. > > Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@xxxxxxxxx> > Reported-by: Anand Moon <linux.amoon@xxxxxxxxx> > > --- > > Patch is losely based on patch in Hardkernel repository [0] and previous > work of Anand Moon [1]. > > [0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7 > [1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html > --- > Documentation/devicetree/bindings/mfd/s2mps11.txt | 4 +++ > drivers/mfd/sec-core.c | 31 +++++++++++++++++++++++ > include/linux/mfd/samsung/core.h | 2 ++ > include/linux/mfd/samsung/s2mps11.h | 1 + > 4 files changed, 38 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt > index 57a045016fca..90eaef393325 100644 > --- a/Documentation/devicetree/bindings/mfd/s2mps11.txt > +++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt > @@ -15,6 +15,10 @@ Optional properties: > - interrupt-parent: Specifies the phandle of the interrupt controller to which > the interrupts from s2mps11 are delivered to. > - interrupts: Interrupt specifiers for interrupt sources. > +- samsung,s2mps11-acokb-ground: Indicates that ACOKB pin of S2MPS11 PMIC is > + connected to the ground so the PMIC must manually set PWRHOLD bit in CTRL1 > + register to turn off the power. Usually the ACOKB is pulled up to VBATT so > + when PWRHOLD pin goes low, the rising ACOKB will trigger power off. > > Optional nodes: > - clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768 > diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c > index d206a3e8fe87..a56ab2102a32 100644 > --- a/drivers/mfd/sec-core.c > +++ b/drivers/mfd/sec-core.c > @@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata( > * not parsed here. > */ > > + pd->manual_poweroff = of_property_read_bool(dev->of_node, > + "samsung,s2mps11-acokb-ground"); > return pd; > } > #else > @@ -440,6 +442,34 @@ static int sec_pmic_remove(struct i2c_client *i2c) > return 0; > } > > +static void sec_pmic_shutdown(struct i2c_client *i2c) > +{ > + struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c); > + unsigned int reg, mask; > + > + if (!sec_pmic->pdata->manual_poweroff) > + return; > + > + switch (sec_pmic->device_type) { > + case S2MPS11X: > + reg = S2MPS11_REG_CTRL1; > + mask = S2MPS11_CTRL1_PWRHOLD_MASK; > + break; > + default: > + /* > + * Currently only one board with S2MPS11 needs this, so just > + * ignore the rest. > + */ > + dev_warn(sec_pmic->dev, > + "Unsupported device %lu for manual power off\n", > + sec_pmic->device_type); > + return; > + } > + > + regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0); > +} > + > + > #ifdef CONFIG_PM_SLEEP > static int sec_pmic_suspend(struct device *dev) > { > @@ -491,6 +521,7 @@ static struct i2c_driver sec_pmic_driver = { > }, > .probe = sec_pmic_probe, > .remove = sec_pmic_remove, > + .shutdown = sec_pmic_shutdown, > .id_table = sec_pmic_id, > }; > > diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h > index 75115384f3fc..aa78957e092f 100644 > --- a/include/linux/mfd/samsung/core.h > +++ b/include/linux/mfd/samsung/core.h > @@ -132,6 +132,8 @@ struct sec_platform_data { > int buck2_init; > int buck3_init; > int buck4_init; > + /* Whether or not manually set PWRHOLD to low during shutdown. */ > + bool manual_poweroff; > }; > > /** > diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h > index 7981a9d77d3f..b288965e8101 100644 > --- a/include/linux/mfd/samsung/s2mps11.h > +++ b/include/linux/mfd/samsung/s2mps11.h > @@ -179,6 +179,7 @@ enum s2mps11_regulators { > #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1) > #define S2MPS11_RAMP_DELAY 25000 /* uV/us */ > > +#define S2MPS11_CTRL1_PWRHOLD_MASK BIT(4) > > #define S2MPS11_BUCK2_RAMP_SHIFT 6 > #define S2MPS11_BUCK34_RAMP_SHIFT 4 > -- > 2.1.4 > Thanks. Tested on Odroid-XU3 board. Tested-by: Anand Moon <linux.amoon@xxxxxxxxx> -- 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
