linux-kernel - [PATCH 10/13] powercap: dtpm: Simplify with of_machine_get_match

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Message-Id: <20251106-b4-of-match-matchine-data-v1-10-d780ea1780c2@linaro.org>
Date: Thu, 06 Nov 2025 20:07:17 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Yangtao Li <tiny.windzz@...il.com>, Chen-Yu Tsai <wens@...nel.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Maximilian Luz <luzmaximilian@...il.com>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Daniel Lezcano <daniel.lezcano@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
 linux-arm-msm@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-tegra@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 10/13] powercap: dtpm: Simplify with
 of_machine_get_match_data()

Replace open-coded getting root OF node, matching against it and getting
the match data with new of_machine_get_match_data() helper.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Depends on the first OF patch.
---
 drivers/powercap/dtpm.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c
index f390665743c4..129d55bc705c 100644
--- a/drivers/powercap/dtpm.c
+++ b/drivers/powercap/dtpm.c
@@ -548,9 +548,7 @@ static int dtpm_for_each_child(const struct dtpm_node *hierarchy,
  */
 int dtpm_create_hierarchy(struct of_device_id *dtpm_match_table)
 {
-	const struct of_device_id *match;
 	const struct dtpm_node *hierarchy;
-	struct device_node *np;
 	int i, ret;

 	mutex_lock(&dtpm_lock);
@@ -567,19 +565,7 @@ int dtpm_create_hierarchy(struct of_device_id *dtpm_match_table)
 		goto out_pct;
 	}

-	ret = -ENODEV;
-	np = of_find_node_by_path("/");
-	if (!np)
-		goto out_err;
-
-	match = of_match_node(dtpm_match_table, np);
-
-	of_node_put(np);
-
-	if (!match)
-		goto out_err;
-
-	hierarchy = match->data;
+	hierarchy = of_machine_get_match_data(dtpm_match_table);
 	if (!hierarchy) {
 		ret = -EFAULT;
 		goto out_err;

-- 
2.48.1