misc: eeprom: eeprom_93cx6: Add quirk for extra read clock cycle

Add a quirk similar to eeprom_93xx46 to add an extra clock cycle before
reading data from the EEPROM.

The 93Cx6 family of EEPROMs ou

misc: eeprom: eeprom_93cx6: Add quirk for extra read clock cycle

Add a quirk similar to eeprom_93xx46 to add an extra clock cycle before
reading data from the EEPROM.

The 93Cx6 family of EEPROMs output a "dummy 0 bit" between the writing
of the op-code/address from the host to the EEPROM and the reading of
the actual data from the EEPROM.

More info can be found on page 6 of the AT93C46 datasheet (linked below).
Similar notes are found in other 93xx6 datasheets.

In summary the read operation for a 93Cx6 EEPROM is:
Write to EEPROM: 110[A5-A0] (9 bits)
Read from EEPROM: 0[D15-D0] (17 bits)

Where:
110 is the start bit and READ OpCode
[A5-A0] is the address to read from
0 is a "dummy bit" preceding the actual data
[D15-D0] is the actual data.

Looking at the READ timing diagrams in the 93Cx6 datasheets the dummy
bit should be clocked out on the last address bit clock cycle meaning it
should be discarded naturally.

However, depending on the hardware configuration sometimes this dummy
bit is not discarded. This is the case with Exar PCI UARTs which require
an extra clock cycle between sending the address and reading the data.

Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-5193-SEEPROM-AT93C46D-Datasheet.pdf
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Parker Newman <[email protected]>
Link: https://lore.kernel.org/r/0f23973efefccd2544705a0480b4ad4c2353e407.1727880931.git.pnewman@connecttech.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details you
should have received a copy of the gnu general public license along
with this program if not write to the free software foundation inc
59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Reviewed-by: Richard Fontana <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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eeprom-93cx6: Add (read-only) support for 8-bit mode

Add read-only support for EEPROMs configured in 8-bit mode (ORG pin connected
to GND).
This will be used by wd719x driver.

Signed-off-by: Ondrej

eeprom-93cx6: Add (read-only) support for 8-bit mode

Add read-only support for EEPROMs configured in 8-bit mode (ORG pin connected
to GND).
This will be used by wd719x driver.

Signed-off-by: Ondrej Zary <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

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eeprom_93cx6: Add write support

Add support for writing data to EEPROM.

Signed-off-by: Ben Dooks <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc

eeprom_93cx6: Add write support

Add support for writing data to EEPROM.

Signed-off-by: Ben Dooks <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Linux Kernel <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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eeprom_93cx6: Add data direction control.

Some devices need to know if the data is to be output or read, so add a
data direction into the eeprom structure to tell the driver whether the
data line sh

eeprom_93cx6: Add data direction control.

Some devices need to know if the data is to be output or read, so add a
data direction into the eeprom structure to tell the driver whether the
data line should be driven.

The user in this case is the Micrel KS8851 which has a direction
control for the EEPROM data line and thus needs to know whether
to drive it (writing) or to tristate it for receiving.

Signed-off-by: Ben Dooks <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Jean Delvare <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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eeprom_93cx6: Add support for 93c86 EEPROMs.

Signed-off-by: Gertjan van Wingerde <[email protected]>
Signed-off-by: Ivo van Doorn <[email protected]>
Signed-off-by: John W. Linville <linville@tuxd

eeprom_93cx6: Add support for 93c86 EEPROMs.

Signed-off-by: Gertjan van Wingerde <[email protected]>
Signed-off-by: Ivo van Doorn <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

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ax88796: add 93cx6 eeprom support

Hook up the 93cx6 eeprom code to the ax88796 driver and modify the ax88796
driver to read out the mac address from the eeprom. We need this for the
ax88796 on cert

ax88796: add 93cx6 eeprom support

Hook up the 93cx6 eeprom code to the ax88796 driver and modify the ax88796
driver to read out the mac address from the eeprom. We need this for the
ax88796 on certain SuperH boards. The pin configuration used to connect
the eeprom to the ax88796 on these boards is the same as pointed out by the
ax88796 datasheet, so we can probably reuse this code for multiple
platforms in the future.

Signed-off-by: Magnus Damm <[email protected]>
Cc: Ben Dooks <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>

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[PATCH] Add 93cx6 eeprom library

This patch adds a library for reading from 93cx6 eeproms.

Signed-off-by: Michael Wu <[email protected]>
Signed-off-by: John W. Linville <[email protected]

[PATCH] Add 93cx6 eeprom library

This patch adds a library for reading from 93cx6 eeproms.

Signed-off-by: Michael Wu <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

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