Merge branch 'pm-domains'

* pm-domains:
  PM / domains: Improve wording of dev_pm_domain_attach() comment
  PM / Domains: Don't return -EEXIST at attach when PM domain exists
  spi: Respect all error codes from dev_pm_domain_attach()
  soundwire: Respect all error codes from dev_pm_domain_attach()
  mmc: sdio: Respect all error codes from dev_pm_domain_attach()
  i2c: Respect all error codes from dev_pm_domain_attach()
  driver core: Respect all error codes from dev_pm_domain_attach()
  amba: Respect all error codes from dev_pm_domain_attach()
  PM / Domains: Allow a better error handling of dev_pm_domain_attach()
  PM / Domains: Check for existing PM domain in dev_pm_domain_attach()
  PM / Domains: Drop redundant code in genpd while attaching devices
  PM / Domains: Drop comment in genpd about legacy Samsung DT binding
  PM / Domains: Fix error path during attach in genpd