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Both displays on digsy_mtc board obtain their configuration from microwire EEPROMs which are connected to the SoC over GPIO lines. We need an easy way to access the EEPROMs to write the needed display configuration or to read out the currently programmed configuration. The generic eeprom_93xx46 SPI driver added by previous patch allows EEPROM access over sysfs. Using the simple driver added by this patch we provide used GPIO interface and access control description on the board for generic eeprom_93xx46 driver and spi_gpio driver. Signed-off-by: Anatolij Gustschin <agust@denx.de> Cc: Jonathan Cameron <jic23@cam.ac.uk> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
3.3 KiB
Plaintext
99 lines
3.3 KiB
Plaintext
menu "EEPROM support"
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config EEPROM_AT24
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tristate "I2C EEPROMs from most vendors"
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depends on I2C && SYSFS
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help
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Enable this driver to get read/write support to most I2C EEPROMs,
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after you configure the driver to know about each EEPROM on
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your target board. Use these generic chip names, instead of
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vendor-specific ones like at24c64 or 24lc02:
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24c00, 24c01, 24c02, spd (readonly 24c02), 24c04, 24c08,
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24c16, 24c32, 24c64, 24c128, 24c256, 24c512, 24c1024
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Unless you like data loss puzzles, always be sure that any chip
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you configure as a 24c32 (32 kbit) or larger is NOT really a
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24c16 (16 kbit) or smaller, and vice versa. Marking the chip
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as read-only won't help recover from this. Also, if your chip
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has any software write-protect mechanism you may want to review the
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code to make sure this driver won't turn it on by accident.
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If you use this with an SMBus adapter instead of an I2C adapter,
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full functionality is not available. Only smaller devices are
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supported (24c16 and below, max 4 kByte).
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This driver can also be built as a module. If so, the module
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will be called at24.
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config EEPROM_AT25
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tristate "SPI EEPROMs from most vendors"
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depends on SPI && SYSFS
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help
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Enable this driver to get read/write support to most SPI EEPROMs,
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after you configure the board init code to know about each eeprom
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on your target board.
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This driver can also be built as a module. If so, the module
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will be called at25.
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config EEPROM_LEGACY
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tristate "Old I2C EEPROM reader"
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depends on I2C && SYSFS
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help
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If you say yes here you get read-only access to the EEPROM data
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available on modern memory DIMMs and Sony Vaio laptops via I2C. Such
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EEPROMs could theoretically be available on other devices as well.
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This driver can also be built as a module. If so, the module
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will be called eeprom.
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config EEPROM_MAX6875
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tristate "Maxim MAX6874/5 power supply supervisor"
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depends on I2C && EXPERIMENTAL
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help
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If you say yes here you get read-only support for the user EEPROM of
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the Maxim MAX6874/5 EEPROM-programmable, quad power-supply
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sequencer/supervisor.
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All other features of this chip should be accessed via i2c-dev.
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This driver can also be built as a module. If so, the module
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will be called max6875.
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config EEPROM_93CX6
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tristate "EEPROM 93CX6 support"
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help
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This is a driver for the EEPROM chipsets 93c46 and 93c66.
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The driver supports both read as well as write commands.
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If unsure, say N.
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config EEPROM_93XX46
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tristate "Microwire EEPROM 93XX46 support"
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depends on SPI && SYSFS
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help
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Driver for the microwire EEPROM chipsets 93xx46x. The driver
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supports both read and write commands and also the command to
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erase the whole EEPROM.
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This driver can also be built as a module. If so, the module
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will be called eeprom_93xx46.
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If unsure, say N.
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config EEPROM_DIGSY_MTC_CFG
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bool "DigsyMTC display configuration EEPROMs device"
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depends on PPC_MPC5200_GPIO && GPIOLIB && SPI_GPIO
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help
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This option enables access to display configuration EEPROMs
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on digsy_mtc board. You have to additionally select Microwire
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EEPROM 93XX46 driver. sysfs entries will be created for that
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EEPROM allowing to read/write the configuration data or to
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erase the whole EEPROM.
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If unsure, say N.
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endmenu
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