Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 138 insertions, 0 deletions

diff --git a/rust/syn/ext.rs b/rust/syn/ext.rs
new file mode 100644
index 000000000..a9be9af42
--- /dev/null
+++ b/rust/syn/ext.rs
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+//! Extension traits to provide parsing methods on foreign types.
+
+use crate::buffer::Cursor;
+use crate::error::Result;
+use crate::parse::ParseStream;
+use crate::parse::Peek;
+use crate::sealed::lookahead;
+use crate::token::CustomToken;
+use proc_macro2::Ident;
+
+/// Additional methods for `Ident` not provided by proc-macro2 or libproc_macro.
+///
+/// This trait is sealed and cannot be implemented for types outside of Syn. It
+/// is implemented only for `proc_macro2::Ident`.
+pub trait IdentExt: Sized + private::Sealed {
+    /// Parses any identifier including keywords.
+    ///
+    /// This is useful when parsing macro input which allows Rust keywords as
+    /// identifiers.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// use syn::{Error, Ident, Result, Token};
+    /// use syn::ext::IdentExt;
+    /// use syn::parse::ParseStream;
+    ///
+    /// mod kw {
+    ///     syn::custom_keyword!(name);
+    /// }
+    ///
+    /// // Parses input that looks like `name = NAME` where `NAME` can be
+    /// // any identifier.
+    /// //
+    /// // Examples:
+    /// //
+    /// //     name = anything
+    /// //     name = impl
+    /// fn parse_dsl(input: ParseStream) -> Result<Ident> {
+    ///     input.parse::<kw::name>()?;
+    ///     input.parse::<Token![=]>()?;
+    ///     let name = input.call(Ident::parse_any)?;
+    ///     Ok(name)
+    /// }
+    /// ```
+    fn parse_any(input: ParseStream) -> Result<Self>;
+
+    /// Peeks any identifier including keywords. Usage:
+    /// `input.peek(Ident::peek_any)`
+    ///
+    /// This is different from `input.peek(Ident)` which only returns true in
+    /// the case of an ident which is not a Rust keyword.
+    #[allow(non_upper_case_globals)]
+    const peek_any: private::PeekFn = private::PeekFn;
+
+    /// Strips the raw marker `r#`, if any, from the beginning of an ident.
+    ///
+    ///   - unraw(`x`) = `x`
+    ///   - unraw(`move`) = `move`
+    ///   - unraw(`r#move`) = `move`
+    ///
+    /// # Example
+    ///
+    /// In the case of interop with other languages like Python that have a
+    /// different set of keywords than Rust, we might come across macro input
+    /// that involves raw identifiers to refer to ordinary variables in the
+    /// other language with a name that happens to be a Rust keyword.
+    ///
+    /// The function below appends an identifier from the caller's input onto a
+    /// fixed prefix. Without using `unraw()`, this would tend to produce
+    /// invalid identifiers like `__pyo3_get_r#move`.
+    ///
+    /// ```
+    /// use proc_macro2::Span;
+    /// use syn::Ident;
+    /// use syn::ext::IdentExt;
+    ///
+    /// fn ident_for_getter(variable: &Ident) -> Ident {
+    ///     let getter = format!("__pyo3_get_{}", variable.unraw());
+    ///     Ident::new(&getter, Span::call_site())
+    /// }
+    /// ```
+    fn unraw(&self) -> Ident;
+}
+
+impl IdentExt for Ident {
+    fn parse_any(input: ParseStream) -> Result<Self> {
+        input.step(|cursor| match cursor.ident() {
+            Some((ident, rest)) => Ok((ident, rest)),
+            None => Err(cursor.error("expected ident")),
+        })
+    }
+
+    fn unraw(&self) -> Ident {
+        let string = self.to_string();
+        if let Some(string) = string.strip_prefix("r#") {
+            Ident::new(string, self.span())
+        } else {
+            self.clone()
+        }
+    }
+}
+
+impl Peek for private::PeekFn {
+    type Token = private::IdentAny;
+}
+
+impl CustomToken for private::IdentAny {
+    fn peek(cursor: Cursor) -> bool {
+        cursor.ident().is_some()
+    }
+
+    fn display() -> &'static str {
+        "identifier"
+    }
+}
+
+impl lookahead::Sealed for private::PeekFn {}
+
+mod private {
+    use proc_macro2::Ident;
+
+    pub trait Sealed {}
+
+    impl Sealed for Ident {}
+
+    pub struct PeekFn;
+    pub struct IdentAny;
+
+    impl Copy for PeekFn {}
+    impl Clone for PeekFn {
+        fn clone(&self) -> Self {
+            *self
+        }
+    }
+}