linux-kernel - [RFT PATCH v2 0/3] hwmon: (spd5118) Various improvements

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Date: Tue, 18 Jun 2024 12:53:45 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: linux-hwmon@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	René Rebe <rene@...ctcode.de>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Armin Wolf <W_Armin@....de>,
	Stephen Horvath <s.horvath@...look.com.au>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Sasha Kozachuk <skozachuk@...gle.com>,
	John Hamrick <johnham@...gle.com>,
	Chris Sarra <chrissarra@...gle.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [RFT PATCH v2 0/3] hwmon: (spd5118) Various improvements

The first patch of this series introduces multi-page support using the
regmap infrastructure. This simplifies the code and improves regmap caching.

The second patch introduces a spd5118-specific regmap bus to implement
SMBus accesses. This solves a problem seen with i801 I2C controllers
when writing to the chip. The I2C_FUNC_SMBUS_I2C_BLOCK support implemented
in those controllers does not work with spd5118 compatible chips, so
byte-by-byte access needs to be used explicitly.

The third patch adds support for spd5118 compatible chips which follow
the standard literally and block access to volatile registers if not
on page 0.

RFT: I was able to test the code on AMD systems using the piix4 I2C
controller. It needs testing with i801 controllers and with Renesas
chips.

v2: Added patches 1 and 2; simplified patch 3 to rely on regmap
    based paging.

----------------------------------------------------------------
Guenter Roeck (3):
      hwmon: (spd5118) Use regmap to implement paging
      hwmon: (spd5118) Use spd5118 specific read/write operations
      hwmon: (spd5118) Add support for Renesas/ITD SPD5118 hub controllers

 drivers/hwmon/Kconfig   |   2 +-
 drivers/hwmon/spd5118.c | 131 +++++++++++++++++++++++++++++++++++++-----------
 2 files changed, 102 insertions(+), 31 deletions(-)