linux-kernel - [PATCH 0/2] clk: qcom: Add support for multiple power-domains for a clock controller.

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Message-Id: <20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-v1-0-b7a2bd82ba37@linaro.org>
Date: Mon, 18 Nov 2024 02:24:31 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH 0/2] clk: qcom: Add support for multiple power-domains for
 a clock controller.

On x1e80100 and it's SKUs the Camera Clock Controller - CAMCC has
multiple power-domains which power it. Usually with a single power-domain
the core platform code will automatically switch on the singleton
power-domain for you. If you have multiple power-domains for a device, in
this case the clock controller, you need to switch those power-domains
on/off yourself.

The clock controllers can also contain Global Distributed
Switch Controllers - GDSCs which themselves can be referenced from dtsi
nodes ultimately triggering a gdsc_en() in drivers/clk/qcom/gdsc.c.

As an example:

cci0: cci@...a000 {
	power-domains = <&camcc TITAN_TOP_GDSC>;
};

This series adds the support to attach a power-domain list to the
clock-controllers and the GDSCs those controllers provide so that in the
case of the above example gdsc_toggle_logic() will trigger the power-domain
list with pm_runtime_resume_and_get() and pm_runtime_put_sync()
respectively.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
Bryan O'Donoghue (2):
      clk: qcom: common: Add support for power-domain attachment
      clk: qcom: gdsc: Add pm_runtime hooks

 drivers/clk/qcom/common.c | 24 ++++++++++++++++++++++++
 drivers/clk/qcom/gdsc.c   | 26 ++++++++++++++++++--------
 drivers/clk/qcom/gdsc.h   |  2 ++
 3 files changed, 44 insertions(+), 8 deletions(-)
---
base-commit: 744cf71b8bdfcdd77aaf58395e068b7457634b2c
change-id: 20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-a5f994dc452a

Best regards,
-- 
Bryan O'Donoghue <bryan.odonoghue@...aro.org>