| Message ID | 1438605447-6836-2-git-send-email-k.kozlowski.k@gmail.com |
|---|---|
| State | Under Review, archived |
| Headers | show |
Hi Krzysztof, On 3 August 2015 at 18:07, Krzysztof Kozlowski <k.kozlowski.k@gmail.com> 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@gmail.com> > Reported-by: Anand Moon <linux.amoon@gmail.com> > > --- > > 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@gmail.com> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hello Krzysztof, On 08/03/2015 02:37 PM, Krzysztof Kozlowski 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). > Is nice to finally have an explanation about why this is needed. > The patch adds respective binding allowing Odroid XU3 device to be > powered off. > > Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com> > Reported-by: Anand Moon <linux.amoon@gmail.com> > > --- > > 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(+) > The patch looks good to me. Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Best regards,
On Mon, 03 Aug 2015, Krzysztof Kozlowski 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@gmail.com> > Reported-by: Anand Moon <linux.amoon@gmail.com> > > --- > > 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. Binding looks fine. Please seperate it into a different patch and apply my Ack: Acked-by: Lee Jones <lee.jones@linaro.org> > 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); > +} > + > + Remove the extra '\n'. When you resubmit, apply my Ack: Acked-by: Lee Jones <lee.jones@linaro.org> > #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
On 11.08.2015 00:49, Lee Jones wrote: > On Mon, 03 Aug 2015, Krzysztof Kozlowski 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@gmail.com> >> Reported-by: Anand Moon <linux.amoon@gmail.com> >> >> --- >> >> 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. > > Binding looks fine. Please seperate it into a different patch and > apply my Ack: > > Acked-by: Lee Jones <lee.jones@linaro.org> OK > >> 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); >> +} >> + >> + > > Remove the extra '\n'. > > When you resubmit, apply my Ack: > > Acked-by: Lee Jones <lee.jones@linaro.org> Sure, I'll resend. The patch may go through your tree because there are no external dependencies. Best regards, Krzysztof > >> #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 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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
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@gmail.com> Reported-by: Anand Moon <linux.amoon@gmail.com> --- 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(+)