Re: [PATCH V5 RESEND 1/5] PM: domains: Allow devices attached to genpd to be managed by HW

[Taniya Das <quic_tdas@quicinc.com>]

On 4/13/2024 8:50 PM, Jagadeesh Kona wrote:
> Some power-domains may be capable of relying on the HW to control the power
> for a device that's hooked up to it. Typically, for these kinds of
> configurations the consumer driver should be able to change the behavior of
> power domain at runtime, control the power domain in SW mode for certain
> configurations and handover the control to HW mode for other usecases.
> 
> To allow a consumer driver to change the behaviour of the PM domain for its
> device, let's provide a new function, dev_pm_genpd_set_hwmode(). Moreover,
> let's add a corresponding optional genpd callback, ->set_hwmode_dev(),
> which the genpd provider should implement if it can support switching
> between HW controlled mode and SW controlled mode. Similarly, add the
> dev_pm_genpd_get_hwmode() to allow consumers to read the current mode and
> its corresponding optional genpd callback, ->get_hwmode_dev(), which the
> genpd provider can also implement to synchronize the initial HW mode
> state in genpd_add_device() by reading back the mode from the hardware.
> 
> Signed-off-by: Ulf Hansson<ulf.hansson@linaro.org>
> Signed-off-by: Abel Vesa<abel.vesa@linaro.org>
> Signed-off-by: Jagadeesh Kona<quic_jkona@quicinc.com>
> Reviewed-by: Dmitry Baryshkov<dmitry.baryshkov@linaro.org>
> Reviewed-by: Dhruva Gole<d-gole@ti.com>
> ---
>   drivers/pmdomain/core.c   | 64 +++++++++++++++++++++++++++++++++++++++
>   include/linux/pm_domain.h | 17 +++++++++++
>   2 files changed, 81 insertions(+)

Reviewed-by: Taniya Das <quic_tdas@quicinc.com>

-- 
Thanks & Regards,
Taniya Das.