linux-kernel - [PATCH v4 09/11] driver core: Introduce an device matching API device_match

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Message-Id: <20241211-const_dfc_done-v4-9-583cc60329df@quicinc.com>
Date: Wed, 11 Dec 2024 08:08:11 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Uwe Kleine-König <ukleinek@...nel.org>, 
 James Bottomley <James.Bottomley@...senPartnership.com>, 
 Thomas Weißschuh <thomas@...ch.de>, 
 Zijun Hu <zijun_hu@...oud.com>, linux-kernel@...r.kernel.org, 
 nvdimm@...ts.linux.dev, linux-sound@...r.kernel.org, 
 sparclinux@...r.kernel.org, linux-block@...r.kernel.org, 
 linux-cxl@...r.kernel.org, linux1394-devel@...ts.sourceforge.net, 
 arm-scmi@...r.kernel.org, linux-efi@...r.kernel.org, 
 linux-gpio@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linux-mediatek@...ts.infradead.org, linux-hwmon@...r.kernel.org, 
 linux-media@...r.kernel.org, linux-pwm@...r.kernel.org, 
 linux-remoteproc@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-usb@...r.kernel.org, linux-serial@...r.kernel.org, 
 netdev@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH v4 09/11] driver core: Introduce an device matching API
 device_match_type()

From: Zijun Hu <quic_zijuhu@...cinc.com>

Introduce device_match_type() for purposes below:

- Test if a device matches with a specified device type.
- As argument of various device finding APIs to find a device with
  specified type.

device_find_child() will use it to simplify operations later.

Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/base/core.c        | 6 ++++++
 include/linux/device/bus.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 289f2dafa8f3831931d0f316d66ee12c2cb8a2e1..8bdbc9e657e832a063542391426f570ccb5c18b9 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -5228,6 +5228,12 @@ int device_match_name(struct device *dev, const void *name)
 }
 EXPORT_SYMBOL_GPL(device_match_name);
 
+int device_match_type(struct device *dev, const void *type)
+{
+	return dev->type == type;
+}
+EXPORT_SYMBOL_GPL(device_match_type);
+
 int device_match_of_node(struct device *dev, const void *np)
 {
 	return dev->of_node == np;
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
index cdc4757217f9bb4b36b5c3b8a48bab45737e44c5..bc3fd74bb763e6d2d862859bd2ec3f0d443f2d7a 100644
--- a/include/linux/device/bus.h
+++ b/include/linux/device/bus.h
@@ -131,6 +131,7 @@ typedef int (*device_match_t)(struct device *dev, const void *data);
 
 /* Generic device matching functions that all busses can use to match with */
 int device_match_name(struct device *dev, const void *name);
+int device_match_type(struct device *dev, const void *type);
 int device_match_of_node(struct device *dev, const void *np);
 int device_match_fwnode(struct device *dev, const void *fwnode);
 int device_match_devt(struct device *dev, const void *pdevt);

-- 
2.34.1