From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Hennerich Subject: question about concurrent regmap i2c usage Date: Tue, 4 Apr 2017 10:28:23 +0200 Message-ID: <76471664-425b-c386-3ad8-efeabc2eaf7e@analog.com> Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit Return-path: Sender: linux-gpio-owner@vger.kernel.org To: broonie@kernel.org, ", linus.walleij"@linaro.org, wsa@the-dreams.de Cc: linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-i2c@vger.kernel.org Hi Mark, During the discussion here: https://lkml.org/lkml/2017/4/4/76 A question came up, regarding whether it's recommended to mix regmap_i2c and plain i2c_smbus or direct adapter transfers. In this specific case for the i2c MUX portion we need to avoid double locks, and therefore use un-locked direct adapter transfers. The same time we also implement a small gpiochip, where we would like to use regmap to avoid some boilerplate code for the register cache. What is your thought on this? -- Greetings, Michael -- Analog Devices GmbH Otl-Aicher Strasse 60-64 80807 München Sitz der Gesellschaft München, Registergericht München HRB 40368, Geschäftsführer: Peter Kolberg, Ali Raza Husain, Eileen Wynne