[PATCH v4 0/5] i3c: introduce and use generic parity helper

From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-i3c@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	"Wolfram Sang" <wsa+renesas@sang-engineering.com>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Guenter Roeck" <linux@roeck-us.net>,
	"Jean Delvare" <jdelvare@suse.com>,
	linux-hwmon@vger.kernel.org, "Przemysław Gaj" <pgaj@cadence.com>,
	"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
	"Yury Norov" <yury.norov@gmail.com>
Subject: [PATCH v4 0/5] i3c: introduce and use generic parity helper
Date: Tue,  7 Jan 2025 10:01:58 +0100	[thread overview]
Message-ID: <20250107090204.6593-1-wsa+renesas@sang-engineering.com> (raw)

Changes since v3:

* updated commit message of patch 4 to state that a bug gets fixed.

All acks from bitmap.h and HWMON maintainers are already included.

Old coverletter follows:

I am currently working on upstreaming another I3C controller driver. As
many others, it needs to ensure odd parity for a dynamically assigned
address. The BSP version of the driver implemented a custom parity
algorithm. Wondering why we don't have a generic helper for this in the
kernel, I found that many I3C controller drivers all implement their
version of handling parity.

So, I sent out an RFC[1] moving the efficient implementation of the
SPD5118 driver to a generic location. The series was well received, but
the path for upstream was not clear. Because I need the implementation
for my I3C controller driver and I3C is a prominent user of this new
function, I got the idea of converting the existing I3C drivers and
resend the series, suggesting this all goes upstream via I3C.

A build-tested branch is here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i3c/get_parity

Looking forward to comments...

[1] https://lore.kernel.org/all/20241214085833.8695-1-wsa+renesas@sang-engineering.com/

Wolfram Sang (5):
  bitops: add generic parity calculation for u8
  hwmon: (spd5118) Use generic parity calculation
  i3c: dw: use parity8 helper instead of open coding it
  i3c: mipi-i3c-hci: use parity8 helper instead of open coding it
  i3c: cdns: use parity8 helper instead of open coding it

 drivers/hwmon/spd5118.c                  |  8 +-----
 drivers/i3c/master/dw-i3c-master.c       | 14 +++--------
 drivers/i3c/master/i3c-master-cdns.c     |  3 +--
 drivers/i3c/master/mipi-i3c-hci/dat_v1.c | 11 +--------
 include/linux/bitops.h                   | 31 ++++++++++++++++++++++++
 5 files changed, 37 insertions(+), 30 deletions(-)

-- 
2.45.2

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