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| -rw-r--r-- | doc/driver-model/UDM-power.txt | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/doc/driver-model/UDM-power.txt b/doc/driver-model/UDM-power.txt new file mode 100644 index 000000000..9ac1a5fbb --- /dev/null +++ b/doc/driver-model/UDM-power.txt @@ -0,0 +1,88 @@ +The U-Boot Driver Model Project +=============================== +POWER analysis +============== +Viktor Krivak <viktor.krivak@gmail.com> +2012-03-09 + +I) Overview +----------- + + 1) Actual state + --------------- + + At this moment power doesn't contain API. There are many methods for + initialization of some board specific functions but only few does what is + expected. Basically only one file contains something meaningful for this + driver. + + 2) Current implementation + ------------------------- + + In file twl6030.c are methods twl6030_stop_usb_charging() and + twl6030_start_usb_charging() for start and stop charging from USB. There are + also methods to get information about battery state and initialization of + battery charging. Only these methods are used in converted API. + + +II) Approach +------------ + + 1) New API + ---------- + + New API implements only functions specific for managing power. All board + specific init methods are moved to other files. Name of methods are + self-explanatory. + + struct ops { + void (*start_usb_charging)(struct instance *i); + void (*stop_usb_charging)(struct instance *i); + int (*get_battery_current)(struct instance *i); + int (*get_battery_voltage)(struct instance *i); + void (*init_battery_charging)(struct instance *i); + } + + 2) Conversions of other methods + ------------------------------- + + Methods that can't be converted to new API are moved to board file or to + special file for board hacks. + +III) Analysis of in-tree drivers +-------------------------------- + + 1) ftpmu010.c + ------------- + All methods of this file are moved to another location. + void ftpmu010_32768osc_enable(void): Move to boards hacks + void ftpmu010_mfpsr_select_dev(unsigned int dev): Move to board file + arch/nds32/lib/board.c + void ftpmu010_mfpsr_diselect_dev(unsigned int dev): Dead code + void ftpmu010_dlldis_disable(void): Dead code + void ftpmu010_sdram_clk_disable(unsigned int cr0): Move to board file + arch/nds32/lib/board.c + void ftpmu010_sdramhtc_set(unsigned int val): Move to board file + arch/nds32/lib/board.c + + 2) twl4030.c + ------------ + All methods of this file are moved to another location. + void twl4030_power_reset_init(void): Move to board hacks + void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val, u8 dev_grp, + u8 dev_grp_sel): Move to board hacks + void twl4030_power_init(void): Move to board hacks + void twl4030_power_mmc_init(void): Move to board hacks + + 3) twl6030.c + ------------ + Some methods are converted to new API and rest are moved to another location. + void twl6030_stop_usb_charging(void): Convert to new API + void twl6030_start_usb_charging(void): Convert to new API + int twl6030_get_battery_current(void): Convert to new API + int twl6030_get_battery_voltage(void): Convert to new API + void twl6030_init_battery_charging(void): Convert to new API + void twl6030_power_mmc_init(): Move to board file + drivers/mmc/omap_hsmmc.c + void twl6030_usb_device_settings(): Move to board file + drivers/usb/musb/omap3.c |