dt-bindings: i3c: add header for generic I3C flags

Add header file for generic I3C flags to avoid hard code in dts file.

Signed-off-by: Carlos Song <[e-mail]>
Reviewed-by: Frank Li <[e-mail]>
Acked-by: Jason Liu <[e-mail]>
Signed-off-by: Frank Li <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

Documentation/devicetree/bindings/i3c/i3c.yaml

···
               - const: 0
               - description: |
                   Shall encode the I3C LVR (Legacy Virtual Register):
+                  See include/dt-bindings/i3c/i3c.h
                     bit[31:8]: unused/ignored
                     bit[7:5]: I2C device index. Possible values:
                       * 0: I2C device has a 50 ns spike filter
···
 
 examples:
   - |
+    #include <dt-bindings/i3c/i3c.h>
+
     i3c@d040000 {
         compatible = "cdns,i3c-master";
         clocks = <&coreclock>, <&i3csysclock>;
···
         /* I2C device. */
         eeprom@57 {
             compatible = "atmel,24c01";
-            reg = <0x57 0x0 0x10>;
+            reg = <0x57 0x0 (I2C_FM | I2C_FILTER)>;
             pagesize = <0x8>;
         };
 

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/i3c/
 F:	Documentation/driver-api/i3c
 F:	drivers/i3c/
+F:	include/dt-bindings/i3c/
 F:	include/linux/i3c/
 
 IBM Operation Panel Input Driver

include/dt-bindings/i3c/i3c.h

···
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+/*
+ * Copyright 2024 NXP
+ */
+
+#ifndef _DT_BINDINGS_I3C_I3C_H
+#define _DT_BINDINGS_I3C_I3C_H
+
+#define I2C_FM      (1 << 4)
+#define I2C_FM_PLUS (0 << 4)
+
+#define I2C_FILTER  (0 << 5)
+#define I2C_NO_FILTER_HIGH_FREQUENCY    (1 << 5)
+#define I2C_NO_FILTER_LOW_FREQUENCY     (2 << 5)
+
+#endif