linux-kernel - [PATCH v2 3/3] pmdomain: imx93-blk-ctrl: add support for optional subnodes

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Message-Id: <20251202-v6-18-topic-imx93-blkctrl-v2-3-e73501034adc@pengutronix.de>
Date: Tue, 02 Dec 2025 14:21:04 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Ulf Hansson <ulf.hansson@...aro.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-pm@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Alexander Stein <alexander.stein@...tq-group.com>, 
 Frank Li <Frank.Li@....com>, Marco Felsch <m.felsch@...gutronix.de>
Subject: [PATCH v2 3/3] pmdomain: imx93-blk-ctrl: add support for optional
 subnodes

This particular block can have DT subnodes describing the LVDS LDB, MIPI
DSI and parallel DPI bridge.

Scan for possible sub-devices within the driver, instead of misusing the
simple-bus to perform the scan.

Reviewed-by: Alexander Stein <alexander.stein@...tq-group.com>
Reviewed-by: Frank Li <Frank.Li@....com>
Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 drivers/pmdomain/imx/imx93-blk-ctrl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
index 49610f2389c3bbaf4de4133918fbcacb7924f672..1afc78b034fad8fa09a3e8527586387156fc2543 100644
--- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
@@ -7,6 +7,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -313,6 +314,10 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to add genpd_provider release callback\n");
 
+	ret = devm_of_platform_populate(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to populate blk-ctrl sub-devices\n");
+
 	return 0;
 }
 

-- 
2.47.3