kernel/git/next/linux-next.git/drivers/mfd/da9063-i2c.c, branch master

mfd: da9063: Occupy second I2C address

2025-11-06T14:03:46+00:00

The second address can be used as a shortcut to access register pages 2+3. The driver does not use this feature yet. The second address should still be marked as used, otherwise userspace could interfere with the driver. Signed-off-by: Wolfram Sang Reviewed-by: Peter Rosin Reviewed-by: Bartosz Golaszewski Reviewed-by: Kieran Bingham Link: https://patch.msgid.link/20251023065610.2855-2-wsa+renesas@sang-engineering.com Signed-off-by: Lee Jones

mfd: da9063: Split chip variant reading in two bus transactions

2025-10-01T09:28:18+00:00

We observed the initial probe of the da9063 failing in da9063_get_device_type in about 30% of boots on a Xilinx ZynqMP based board. The problem originates in da9063_i2c_blockreg_read, which uses a single bus transaction to turn the register page and then read a register. On the bus, this should translate to a write to register 0, followed by a read to the target register, separated by a repeated start. However, we found that after the write to register 0, the controller sometimes continues directly with the register address of the read request, without sending the chip address or a repeated start in between, which makes the read request invalid. To fix this, separate turning the page and reading the register into two separate transactions. This brings the initialization code in line with the rest of the driver, which uses register maps (which to my knowledge do not use repeated starts after turning the page). This has been included in our kernel for several months and was recently included in a shipped product. For us, it reliably fixes the issue, and we have not observed any new issues. While the underlying problem is probably with the i2c controller or its driver, I still propose a change here in the interest of robustness: First, I'm not sure this issue can be fixed on the controller side, since there are other issues related to repeated start which can't (AR# 60695, AR# 61664). Second, similar problems might exist with other controllers. Signed-off-by: Jens Kehne Link: https://lore.kernel.org/r/20250804133754.3496718-1-jens.kehne@agilent.com Signed-off-by: Lee Jones

mfd: dialog: Convert to use maple tree register cache

2024-02-23T14:58:04+00:00

The maple tree register cache is based on a much more modern data structure than the rbtree cache and makes optimisation choices which are probably more appropriate for modern systems than those made by the rbtree cache. Signed-off-by: Bo Liu Link: https://lore.kernel.org/r/20240206071314.8721-8-liubo03@inspur.com Signed-off-by: Lee Jones

mfd: Switch i2c drivers back to use .probe()

2023-06-15T08:19:37+00:00

After commit b8a1a4cd5a98 ("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then 03c835f498b5 ("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20230515182752.10050-1-u.kleine-koenig@pengutronix.de Signed-off-by: Lee Jones

mfd: da9063-i2c: Convert to i2c's .probe_new()

2022-12-07T13:27:21+00:00

.probe_new() doesn't get the i2c_device_id * parameter, so determine that explicitly in the probe function. Signed-off-by: Uwe Kleine-König Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20221118224540.619276-430-uwe@kleine-koenig.org

mfd: da9063: Add support for latest EA silicon revision

2021-11-05T14:40:05+00:00

This update adds new regmap to support the latest EA silicon which will be selected based on the chip and variant information read from the device. Signed-off-by: Carlos de Paula Reviewed-by: Adam Thomson Signed-off-by: Lee Jones

mfd: da9063: Propagate errno when I2C mode fails

2021-06-02T09:51:17+00:00

Don't hardocde EIO but use the obtained value. Signed-off-by: Wolfram Sang Reviewed-by: Mark Jonas Signed-off-by: Lee Jones

mfd: da9063: Support SMBus and I2C mode

2021-04-14T15:06:05+00:00

By default the PMIC DA9063 2-wire interface is SMBus compliant. This means the PMIC will automatically reset the interface when the clock signal ceases for more than the SMBus timeout of 35 ms. If the I2C driver / device is not capable of creating atomic I2C transactions, a context change can cause a ceasing of the clock signal. This can happen if for example a real-time thread is scheduled. Then the DA9063 in SMBus mode will reset the 2-wire interface. Subsequently a write message could end up in the wrong register. This could cause unpredictable system behavior. The DA9063 PMIC also supports an I2C compliant mode for the 2-wire interface. This mode does not reset the interface when the clock signal ceases. Thus the problem depicted above does not occur. This patch tests for the bus functionality "I2C_FUNC_I2C". It can reasonably be assumed that the bus cannot obey SMBus timings if this functionality is set. SMBus commands most probably are emulated in this case which is prone to the latency issue described above. This patch enables the I2C bus mode if I2C_FUNC_I2C is set or otherwise keeps the default SMBus mode. Signed-off-by: Hubert Streidl Signed-off-by: Mark Jonas Reviewed-by: Wolfram Sang Signed-off-by: Lee Jones

mfd: da9063: Drop of_match_ptr from of_device_id table

2020-11-27T08:01:12+00:00

The driver can match only via the DT table so the table should be always used and the of_match_ptr does not have any sense (this also allows ACPI matching via PRP0001, even though it is not relevant here). This fixes compile warning (!CONFIG_OF on x86_64): drivers/mfd/da9063-i2c.c:348:34: warning: ‘da9063_dt_ids’ defined but not used [-Wunused-const-variable=] Signed-off-by: Krzysztof Kozlowski Signed-off-by: Lee Jones

mfd: da9063: Add support for latest DA silicon revision

2020-08-13T06:49:50+00:00

This update adds new regmap tables to support the latest DA silicon which will automatically be selected based on the chip and variant information read from the device. Signed-off-by: Adam Thomson Signed-off-by: Lee Jones