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The tps23861 registers are little-endian, and regmap_read_bulk() does
not do byte order conversion. On BE machines, the bytes were swapped,
and the interpretation of the resistance value was incorrect.
To make it work on both big and little-endian machines, use
le16_to_cpu() to convert the resitance register to host byte order.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Fixes: fff7b8ab22554 ("hwmon: add Texas Instruments TPS23861 driver")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220905142806.110598-1-mr.nuke.me@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Trying to use this driver on a big-endian machine results in garbage
values for voltage and current. The tps23861 registers are little-
endian, and regmap_read_bulk() does not do byte order conversion. Thus
on BE machines, the most significant bytes got modified, and were
trimmed by the VOLTAGE_CURRENT_MASK.
To resolve this use uint16_t values, and convert them to host byte
order using le16_to_cpu(). This results in correct readings on MIPS.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Link: https://lore.kernel.org/r/20220721032255.2850647-1-mr.nuke.me@gmail.com
[groeck: Use __le16 instead of uint16_t]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Current shunt LSB values got reversed during in the
original driver commit.
So, correct the current shunt LSB values according to
the datasheet.
This caused reading slightly skewed current values.
Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20210609220728.499879-3-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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TPS23861 has a configuration bit for setting of the
current shunt value used on the board.
Its bit 0 of the General Mask 1 register.
According to the datasheet bit values are:
0 for 255 mOhm (Default)
1 for 250 mOhm
So, configure the bit before registering the hwmon
device according to the value passed in the DTS or
default one if none is passed.
This caused potentially reading slightly skewed values
due to max current value being 1.02A when 250mOhm shunt
is used instead of 1.0A when 255mOhm is used.
Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20210609220728.499879-2-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Define the max register address the device supports.
This allows reading the whole register space via
regmap debugfs, without it only register 0x0 is visible.
This was forgotten in the original driver commit.
Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20210609220728.499879-1-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Add basic monitoring support as well as port on/off control for Texas
Instruments TPS23861 PoE PSE IC.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210121134434.2782405-2-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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