linux-kernel - [PATCH v1 0/2] [PATCH] hwmon: (pmbus/max31785) Add minimum delay between bus accesses

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Message-Id: <20231009211420.3454026-1-lakshmiy@us.ibm.com>
Date:   Mon,  9 Oct 2023 16:14:18 -0500
From:   Lakshmi Yadlapati <lakshmiy@...ibm.com>
To:     linux@...ck-us.net, wsa@...nel.org, sumit.semwal@...aro.org,
        christian.koenig@....com, jdelvare@...e.com, joel@....id.au,
        andrew@...id.au, eajames@...ux.ibm.com, ninad@...ux.ibm.com
Cc:     Lakshmi Yadlapati <lakshmiy@...ibm.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-hwmon@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH v1 0/2] [PATCH] hwmon: (pmbus/max31785) Add minimum delay between bus accesses

Reintroduce per-client throttling of transfers for improved compatibility.

Some devices have experienced issues with small command turn-around times when using in-kernel device drivers. While a previous proposal was rejected due to concerns about error-prone open-coding of delays, recent upstream changes for similar problems in I2C devices (e.g., max15301 and ucd90320) and now max31785 make it sensible to reintroduce Andrew's generic solution. This change aims to improve compatibility for affected devices and may help avoid duplicating implementations of handlers for I2C and PMBus calls in driver code.

Reference to Andrew's previous proposal:
https://lore.kernel.org/all/20200914122811.3295678-1-andrew@aj.id.au/

Lakshmi Yadlapati (2):
  i2c: smbus: Allow throttling of transfers to client devices
  hwmon: (pmbus/max31785) Add minimum delay between bus accesses

 drivers/hwmon/pmbus/max31785.c |   8 ++
 drivers/i2c/i2c-core-base.c    |   8 +-
 drivers/i2c/i2c-core-smbus.c   | 143 ++++++++++++++++++++++++++-------
 drivers/i2c/i2c-core.h         |  23 ++++++
 include/linux/i2c.h            |   2 +
 5 files changed, 153 insertions(+), 31 deletions(-)

-- 
2.39.2