Merge tag 'i3c/for-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux

Pull i3c updates from Alexandre Belloni:
 "The main change is the addition of PCI bus support for mipi-i3c-hci.

  I'm also carrying an hwmon patch as it makes use of the bitops
  addition that is then mainly used by i3c drivers.

  Core:
   - Improve initialization of numbered I2C adapters

  Drivers:
   - use parity8 helper
   - dw: fix possible use-after-free
   - mipi-i3c-hci: add support for PCI bus host
   - svc: many fixes for IBI and hotjoin"

* tag 'i3c/for-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c: master: Improve initialization of numbered I2C adapters
  i3c: master: Fix missing 'ret' assignment in set_speed()
  i3c: cdns: use parity8 helper instead of open coding it
  i3c: mipi-i3c-hci: use parity8 helper instead of open coding it
  i3c: dw: use parity8 helper instead of open coding it
  hwmon: (spd5118) Use generic parity calculation
  bitops: add generic parity calculation for u8
  i3c: mipi-i3c-hci: Add support for MIPI I3C HCI on PCI bus
  i3c: mipi-i3c-hci: Add Intel specific quirk to ring resuming
  i3c: fix kdoc parameter description for module_i3c_i2c_driver()
  i3c: dw: Fix use-after-free in dw_i3c_master driver due to race condition

2 files changed, 32 insertions, 1 deletions

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index ba35bbf07798..c1cb53cf2f0f 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -230,6 +230,37 @@ static inline int get_count_order_long(unsigned long l)
 }
 
 /**
+ * parity8 - get the parity of an u8 value
+ * @value: the value to be examined
+ *
+ * Determine the parity of the u8 argument.
+ *
+ * Returns:
+ * 0 for even parity, 1 for odd parity
+ *
+ * Note: This function informs you about the current parity. Example to bail
+ * out when parity is odd:
+ *
+ *	if (parity8(val) == 1)
+ *		return -EBADMSG;
+ *
+ * If you need to calculate a parity bit, you need to draw the conclusion from
+ * this result yourself. Example to enforce odd parity, parity bit is bit 7:
+ *
+ *	if (parity8(val) == 0)
+ *		val ^= BIT(7);
+ */
+static inline int parity8(u8 val)
+{
+	/*
+	 * One explanation of this algorithm:
+	 * https://funloop.org/codex/problem/parity/README.html
+	 */
+	val ^= val >> 4;
+	return (0x6996 >> (val & 0xf)) & 1;
+}
+
+/**
  * __ffs64 - find first set bit in a 64 bit word
  * @word: The 64 bit word
  *
diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index 0a8a44ac2f02..b674f64d0822 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -283,7 +283,7 @@ static inline void i3c_i2c_driver_unregister(struct i3c_driver *i3cdrv,
  * module_i3c_i2c_driver() - Register a module providing an I3C and an I2C
  *			     driver
  * @__i3cdrv: the I3C driver to register
- * @__i2cdrv: the I3C driver to register
+ * @__i2cdrv: the I2C driver to register
  *
  * Provide generic init/exit functions that simply register/unregister an I3C
  * and an I2C driver.