diff options
| author | Cory Tusar <cory.tusar@pid1solutions.com> | 2016-02-10 22:32:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-12 06:23:28 +0300 |
| commit | e1379b56e9e88653fcb58cbaa71cd6b1cc304918 (patch) | |
| tree | 4c95727d77b5300877148d3782e23b66494c8c16 /include/linux/eeprom_93xx46.h | |
| parent | cf09d6428de3aa6bb6a8164d86bc1cc0cd678d8e (diff) | |
| download | linux-e1379b56e9e88653fcb58cbaa71cd6b1cc304918.tar.xz | |
misc: eeprom_93xx46: Add quirks to support Atmel AT93C46D device.
Atmel devices in this family have some quirks not found in other similar
chips - they do not support a sequential read of the entire EEPROM
contents, and the control word sent at the start of each operation
varies in bit length.
This commit adds quirk support to the driver and modifies the read
implementation to support non-sequential reads for consistency with
other misc/eeprom drivers.
Tested on a custom Freescale VF610-based platform, with an AT93C46D
device attached via dspi2. The spi-gpio driver was used to allow the
necessary non-byte-sized transfers.
Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
Tested-by: Chris Healy <chris.healy@zii.aero>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/eeprom_93xx46.h')
| -rw-r--r-- | include/linux/eeprom_93xx46.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/eeprom_93xx46.h b/include/linux/eeprom_93xx46.h index 06791811e49d..92fa4c37ac1f 100644 --- a/include/linux/eeprom_93xx46.h +++ b/include/linux/eeprom_93xx46.h @@ -9,6 +9,12 @@ struct eeprom_93xx46_platform_data { #define EE_ADDR16 0x02 /* 16 bit addr. cfg */ #define EE_READONLY 0x08 /* forbid writing */ + unsigned int quirks; +/* Single word read transfers only; no sequential read. */ +#define EEPROM_93XX46_QUIRK_SINGLE_WORD_READ (1 << 0) +/* Instructions such as EWEN are (addrlen + 2) in length. */ +#define EEPROM_93XX46_QUIRK_INSTRUCTION_LENGTH (1 << 1) + /* * optional hooks to control additional logic * before and after spi transfer. |