Parker Newman
9ab3a1aaa5
misc: eeprom: eeprom_93cx6: Add quirk for extra read clock cycle ...
[ Upstream commit 7738a7ab9d12c5371ed97114ee2132d4512e9fd5 ]
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 <andriy.shevchenko@linux.intel.com>
Signed-off-by: Parker Newman <pnewman@connecttech.com>
Link: https://lore.kernel.org/r/0f23973efefccd2544705a0480b4ad4c2353e407.1727880931.git.pnewman@connecttech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-12-14 19:44:55 +01:00
can: sja1000: fix size of OCR_MODE_MASK define
2022-12-19 12:24:16 +01:00
firmware: meson_sm: Rework driver as a proper platform driver
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2022-06-14 18:11:59 +02:00
mailbox: zynqmp: Fix typo in IPI documentation
2023-05-17 11:35:55 +02:00
net: xgene: Move shared header file into include/linux
2023-02-06 07:52:47 +01:00
mfd: t7l66xb: Drop platform disable callback
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2022-07-29 17:14:18 +02:00
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misc: eeprom: eeprom_93cx6: Add quirk for extra read clock cycle
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random: pull add_hwgenerator_randomness() declaration into random.h
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2024-09-12 11:03:50 +02:00
Fix termination state for idr_for_each_entry_ul()
2023-11-20 10:30:15 +01:00
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2023-10-10 21:46:37 +02:00
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2021-12-01 09:23:35 +01:00
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2024-12-14 19:44:23 +01:00
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2022-08-25 11:18:04 +02:00
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2023-01-18 11:41:56 +01:00
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2022-05-25 09:14:32 +02:00
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2023-10-25 11:53:19 +02:00
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2021-10-09 14:39:49 +02:00
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2022-01-05 12:37:44 +01:00
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2021-08-26 08:36:22 -04:00
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2021-09-22 12:26:43 +02:00
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2024-07-05 09:08:27 +02:00
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2022-12-08 11:23:04 +01:00
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2022-05-15 19:54:46 +02:00
x86/cpu: Add a steppings field to struct x86_cpu_id
2022-10-07 09:16:54 +02:00
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2021-08-18 08:57:03 +02:00
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2023-09-23 10:59:40 +02:00
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2022-05-18 09:47:24 +02:00
net: add DEV_STATS_READ() helper
2023-11-20 10:30:10 +01:00
Remove DECnet support from kernel
2023-06-21 15:44:10 +02:00
Remove DECnet support from kernel
2023-06-21 15:44:10 +02:00
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2022-04-15 14:18:35 +02:00
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2022-06-14 18:12:02 +02:00
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2024-07-05 09:08:28 +02:00
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2024-08-19 05:33:28 +02:00
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2023-12-13 18:18:11 +01:00
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2021-12-08 09:01:08 +01:00
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2023-12-13 18:18:11 +01:00
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2022-11-01 19:06:42 +01:00
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2021-09-03 10:08:12 +02:00
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2023-01-18 11:41:02 +01:00
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2022-02-05 12:35:36 +01:00
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2023-11-08 11:23:39 +01:00
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2022-09-05 10:27:39 +02:00
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2024-02-23 08:25:15 +01:00
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2023-07-27 08:37:38 +02:00
serial: core: fix kernel-doc for uart_port_unlock_irqrestore()
2024-05-02 16:18:37 +02:00
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2023-03-22 13:28:08 +01:00
siphash: use one source of truth for siphash permutations
2022-06-22 14:11:16 +02:00
inet: inet_defrag: prevent sk release while still in use
2024-11-08 16:20:26 +01:00
net: make get_net_ns return error if NET_NS is disabled
2021-06-23 14:41:25 +02:00
net: stmmac: do not stop RX_CLK in Rx LPI state for qcs404 SoC
2023-02-22 12:50:34 +01:00
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2023-02-06 07:52:48 +01:00
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2024-07-18 11:40:53 +02:00
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thermal/core: Fix thermal_cooling_device_register() prototype
2021-09-26 14:07:10 +02:00
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2023-05-17 11:35:57 +02:00
Revert "time: Handle negative seconds correctly in timespec64_to_ns()"
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2024-04-13 12:51:21 +02:00
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2023-03-22 13:28:08 +01:00
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2023-05-17 11:36:04 +02:00
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2022-07-29 17:14:20 +02:00
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2023-03-11 16:43:56 +01:00
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2024-02-23 08:24:47 +01:00
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2024-08-19 05:33:30 +02:00
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virtio: unexport virtio_finalize_features
2022-03-16 13:21:48 +01:00
virtio: acknowledge all features before access
2022-03-16 13:21:48 +01:00
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2023-08-30 16:27:17 +02:00
linux/vt_buffer.h: allow either builtin or modular for macros
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XArray: add xas_split
2021-06-10 13:37:14 +02:00
