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authorMichal Vokáč <michal.vokac@ysoft.com>2018-10-01 17:19:48 +0300
committerThierry Reding <thierry.reding@gmail.com>2018-12-12 13:52:47 +0300
commitbf9b0b1b0b6cd51797ce79b6fa5fc2d1baa2719e (patch)
treef8d92ab5fc082aea2e73d695902a2dc033c4478a /drivers/pwm/pwm-img.c
parent9f617ada9f823dff1944ebcf92ef4a05f5f322b7 (diff)
downloadlinux-bf9b0b1b0b6cd51797ce79b6fa5fc2d1baa2719e.tar.xz
pwm: imx: Implement get_state() function for hardware readout
Implement the get_state() function and set the initial state to reflect real state of the hardware. This allows to keep the PWM running if it was enabled in bootloader. It is very similar to the GPIO behavior. GPIO pin set as output in bootloader keep the same setting in Linux unless it is reconfigured. If we find the PWM block enabled we need to prepare and enable its source clock otherwise the clock will be disabled late in the boot as unused. That will leave the PWM in enabled state but with disabled clock. That has a side effect that the PWM output is left at its current level at which the clock was disabled. It is totally non-deterministic and it may be LOW or HIGH. Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-img.c')
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