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