linux-kernel - [PATCH 1/2] clk: qcom: common: Add support for power-domain attachment

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Message-Id: <20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-v1-1-b7a2bd82ba37@linaro.org>
Date: Mon, 18 Nov 2024 02:24:32 +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 1/2] clk: qcom: common: Add support for power-domain
 attachment

Right now we have a plethora of singleton power-domains which power clock
controllers. These singletons are switched on by core logic when we probe
the clocks.

However when multiple power-domains are attached to a clock controller that
list of power-domains needs to be managed outside of core logic.

Use dev_pm_domain_attach_list() to automatically hook the list of given
power-domains in the dtsi for the clock being registered in
qcom_cc_really_probe().

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/clk/qcom/common.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index 33cc1f73c69d1f875a193aea0552902268dc8716..b4377fa09f7c0ec8d3c63dfc97d04fbb8cd6e10b 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -22,6 +22,7 @@ struct qcom_cc {
 	struct qcom_reset_controller reset;
 	struct clk_regmap **rclks;
 	size_t num_rclks;
+	struct dev_pm_domain_list *pd_list;
 };
 
 const
@@ -283,6 +284,25 @@ static int qcom_cc_icc_register(struct device *dev,
 						     desc->num_icc_hws, icd);
 }
 
+static int qcom_cc_pds_attach(struct device *dev, struct qcom_cc *cc)
+{
+	struct dev_pm_domain_attach_data pd_data = {
+		.pd_names = 0,
+		.num_pd_names = 0,
+	};
+	int ret;
+
+	/* Only one power-domain platform framework will hook it up */
+	if (dev->pm_domain)
+		return 0;
+
+	ret = dev_pm_domain_attach_list(dev, &pd_data, &cc->pd_list);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 int qcom_cc_really_probe(struct device *dev,
 			 const struct qcom_cc_desc *desc, struct regmap *regmap)
 {
@@ -299,6 +319,10 @@ int qcom_cc_really_probe(struct device *dev,
 	if (!cc)
 		return -ENOMEM;
 
+	ret = qcom_cc_pds_attach(dev, cc);
+	if (ret)
+		return ret;
+
 	reset = &cc->reset;
 	reset->rcdev.of_node = dev->of_node;
 	reset->rcdev.ops = &qcom_reset_ops;

-- 
2.45.2