linux-kernel - [PATCH 5/8] platform: add platform_get_device_match

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Message-Id: <20240815-ad7606_add_iio_backend_support-v1-5-cea3e11b1aa4@baylibre.com>
Date: Thu, 15 Aug 2024 12:11:59 +0000
From: Guillaume Stols <gstols@...libre.com>
To: Uwe Kleine-König <ukleinek@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 linux-fbdev@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org, 
 Guillaume Stols <gstols@...libre.com>, 
 20240705211452.1157967-2-u.kleine-koenig@...libre.com, 
 20240712171821.1470833-2-u.kleine-koenig@...libre.com, 
 cover.1721040875.git.u.kleine-koenig@...libre.com, aardelean@...libre.com
Subject: [PATCH 5/8] platform: add platform_get_device_match_data() helper

Inspired from spi_get_device_match_data() helper: if OF or ACPI driver
data is available, platform_get_device_id will return NULL because
platform_match_id is not called, and pdev->id_entry is never populated.
This helper function checks if match data is available, and otherwise
returns the ID table data.

Signed-off-by: Guillaume Stols <gstols@...libre.com>
---
 drivers/base/platform.c         | 12 ++++++++++++
 include/linux/platform_device.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4c3ee6521ba5..26e9a026eb05 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1090,6 +1090,18 @@ static const struct platform_device_id *platform_match_id(
 	return NULL;
 }

+const void *platform_get_device_match_data(const struct platform_device *pdev)
+{
+	const struct platform_device_id *match;
+
+	match = device_get_match_data(&pdev->dev);
+	if (match)
+		return match;
+
+	return (const void *)platform_get_device_id(pdev)->driver_data;
+}
+EXPORT_SYMBOL_GPL(platform_get_device_match_data);
+
 #ifdef CONFIG_PM_SLEEP

 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index d422db6eec63..e2cc09ecc447 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -45,6 +45,7 @@ struct platform_device {
 };

 #define platform_get_device_id(pdev)	((pdev)->id_entry)
+extern const void *platform_get_device_match_data(const struct platform_device *pdev);

 #define dev_is_platform(dev) ((dev)->bus == &platform_bus_type)
 #define to_platform_device(x) container_of((x), struct platform_device, dev)

-- 
2.34.1