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Commit f1d086c9 authored by Erik Schumacher's avatar Erik Schumacher Committed by Greg Kroah-Hartman
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pwm: imx-tpm: Use correct MODULO value for EPWM mode



commit cc6a931d1f3b412263d515fd93b21fc0ca5147fe upstream.

The modulo register defines the period of the edge-aligned PWM mode
(which is the only mode implemented). The reference manual states:
"The EPWM period is determined by (MOD + 0001h) ..." So the value that
is written to the MOD register must therefore be one less than the
calculated period length. Return -EINVAL if the calculated length is
already zero.
A correct MODULO value is particularly relevant if the PWM has to output
a high frequency due to a low period value.

Fixes: 738a1cfe ("pwm: Add i.MX TPM PWM driver support")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarErik Schumacher <erik.schumacher@iris-sensing.com>
Link: https://lore.kernel.org/r/1a3890966d68b9f800d457cbf095746627495e18.camel@iris-sensing.com


Signed-off-by: default avatarUwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0bfc6e38
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