Commit 2abac6213d9d05c34fba7dcaa2934668774008a7
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3c781190d1
Exists in
v2017.01-smarct4x
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sunxi: axp221: Add support for controlling the drivebus pin
The axp221 / axp223's N_VBUSEN pin can be configured as an output rather then an input, add axp_drivebus_enable() and _disable() functions to set the pin in output mode and control it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
Showing 2 changed files with 45 additions and 0 deletions Side-by-side Diff
drivers/power/axp221.c
| ... | ... | @@ -353,4 +353,40 @@ |
| 353 | 353 | |
| 354 | 354 | return 0; |
| 355 | 355 | } |
| 356 | + | |
| 357 | +static int axp_drivebus_setup(void) | |
| 358 | +{ | |
| 359 | + int ret; | |
| 360 | + | |
| 361 | + ret = axp221_init(); | |
| 362 | + if (ret) | |
| 363 | + return ret; | |
| 364 | + | |
| 365 | + /* Set N_VBUSEN pin to output / DRIVEBUS function */ | |
| 366 | + return axp221_clrbits(AXP221_MISC_CTRL, AXP221_MISC_CTRL_N_VBUSEN_FUNC); | |
| 367 | +} | |
| 368 | + | |
| 369 | +int axp_drivebus_enable(void) | |
| 370 | +{ | |
| 371 | + int ret; | |
| 372 | + | |
| 373 | + ret = axp_drivebus_setup(); | |
| 374 | + if (ret) | |
| 375 | + return ret; | |
| 376 | + | |
| 377 | + /* Set DRIVEBUS high */ | |
| 378 | + return axp221_setbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS); | |
| 379 | +} | |
| 380 | + | |
| 381 | +int axp_drivebus_disable(void) | |
| 382 | +{ | |
| 383 | + int ret; | |
| 384 | + | |
| 385 | + ret = axp_drivebus_setup(); | |
| 386 | + if (ret) | |
| 387 | + return ret; | |
| 388 | + | |
| 389 | + /* Set DRIVEBUS low */ | |
| 390 | + return axp221_clrbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS); | |
| 391 | +} |
include/axp221.h
| ... | ... | @@ -45,11 +45,18 @@ |
| 45 | 45 | #define AXP221_ALDO1_CTRL 0x28 |
| 46 | 46 | #define AXP221_ALDO2_CTRL 0x29 |
| 47 | 47 | #define AXP221_ALDO3_CTRL 0x2a |
| 48 | +#define AXP221_VBUS_IPSOUT 0x30 | |
| 49 | +#define AXP221_VBUS_IPSOUT_DRIVEBUS (1 << 2) | |
| 50 | +#define AXP221_MISC_CTRL 0x8f | |
| 51 | +#define AXP221_MISC_CTRL_N_VBUSEN_FUNC (1 << 4) | |
| 48 | 52 | #define AXP221_PAGE 0xff |
| 49 | 53 | |
| 50 | 54 | /* Page 1 addresses */ |
| 51 | 55 | #define AXP221_SID 0x20 |
| 52 | 56 | |
| 57 | +/* We support drivebus control */ | |
| 58 | +#define AXP_DRIVEBUS | |
| 59 | + | |
| 53 | 60 | int axp221_set_dcdc1(unsigned int mvolt); |
| 54 | 61 | int axp221_set_dcdc2(unsigned int mvolt); |
| 55 | 62 | int axp221_set_dcdc3(unsigned int mvolt); |
| ... | ... | @@ -64,4 +71,6 @@ |
| 64 | 71 | int axp221_set_aldo3(unsigned int mvolt); |
| 65 | 72 | int axp221_init(void); |
| 66 | 73 | int axp221_get_sid(unsigned int *sid); |
| 74 | +int axp_drivebus_enable(void); | |
| 75 | +int axp_drivebus_disable(void); |