Merge tag 'device-id-rework' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

Pull mod_devicetable.h header split from Uwe Kleine-König:
 "Split <linux/mod_devicetable.h> in per subsystem headers

  <linux/mod_devicetable.h> is included transitively in nearly every
  driver in an x86_64 allmodconfig build of v7.1:

      $ find drivers -name \*.o -not -name \*.mod.o | wc -l
      21330
      $ find drivers -name \*.o.cmd -not -name \*.mod.o.cmd | xargs grep -l mod_devicetable.h | wc -l
      17038

  The result of this mixture of different and unrelated subsystem
  details is that even when touching an obscure device id struct most of
  the kernel needs to be recompiled. Given that each driver typically
  only needs one or two of these structures, splitting into per
  subsystem headers and only including what is really needed reduces the
  amount of needed recompilation.

  This split is implemented in the first commit and then after some
  preparatory work in the following commits, the last two replace
  includes of <linux/mod_devicetable.h> by the actually needed more
  specific headers.

  There are still a few instances left, but the ones with high impact
  (that is in headers that are used a lot) and the easy ones (.c files)
  are handled. These remaining includes will be addressed during the
  next merge window"

* tag 'device-id-rework' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux:
  Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files)
  Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (headers)
  parisc: #include <linux/compiler.h> for unlikely() in <asm/ptrace.h>
  media: em28xx: Add include for struct usb_device_id
  LoongArch: KVM: Add include defining struct cpu_feature
  ALSA: hda/core: Add include defining struct hda_device_id
  usb: dwc2: Add include defining struct pci_device_id
  platform/x86: int3472: Add include defining struct dmi_system_id
  platform/x86: x86-android-tablets: Add include defining struct dmi_system_id
  i2c: Let i2c-core.h include <linux/i2c.h>
  of: Explicitly include <linux/types.h> and <linux/err.h>
  platform/x86: msi-ec: Ensure dmi_system_id is defined
  usb: serial: Include <linux/usb.h> in <linux/usb/serial.h>
  driver core: platform: Include header for struct platform_device_id
  driver: core: Include headers for acpi_device_id and of_device_id for struct device_driver
  media: ti: vpe: #include <linux/platform_device.h> explicitly
  mod_devicetable.h: Split into per subsystem headers

1 files changed, 34 insertions, 0 deletions

diff --git a/include/linux/device-id/dfl.h b/include/linux/device-id/dfl.h
new file mode 100644
index 000000000000..bd0c9dbafeeb
--- /dev/null
+++ b/include/linux/device-id/dfl.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_DEVICE_ID_DFL_H
+#define LINUX_DEVICE_ID_DFL_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+typedef unsigned long kernel_ulong_t;
+#endif
+
+/*
+ * DFL (Device Feature List)
+ *
+ * DFL defines a linked list of feature headers within the device MMIO space to
+ * provide an extensible way of adding features. Software can walk through these
+ * predefined data structures to enumerate features. It is now used in the FPGA.
+ * See Documentation/fpga/dfl.rst for more information.
+ *
+ * The dfl bus type is introduced to match the individual feature devices (dfl
+ * devices) for specific dfl drivers.
+ */
+
+/**
+ * struct dfl_device_id -  dfl device identifier
+ * @type: DFL FIU type of the device. See enum dfl_id_type.
+ * @feature_id: feature identifier local to its DFL FIU type.
+ * @driver_data: driver specific data.
+ */
+struct dfl_device_id {
+	__u16 type;
+	__u16 feature_id;
+	kernel_ulong_t driver_data;
+};
+
+#endif /* ifndef LINUX_DEVICE_ID_DFL_H */