linux-kernel - Re: [PATCH v3] i2c: lpi2c: cache peripheral clock rate

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Message-ID: <20230421-kinfolk-glancing-e185fd9c47b4-mkl@pengutronix.de>
Date:   Fri, 21 Apr 2023 15:59:52 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     NXP Linux Team <linux-imx@....com>,
        "A. Sverdlin" <alexander.sverdlin@...mens.com>,
        Dong Aisheng <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] i2c: lpi2c: cache peripheral clock rate

On 21.04.2023 15:48:59, Alexander Stein wrote:
[...]
> Now lpi2c_runtime_resume will call into clk_prepare() which also calls 
> clk_prepare_lock() (identical to clk_get_rate).

IIRC this is a general problem^w limitation of the clock framework,
clock providers cannot use clocks themselves in certain callback, e.g.
set_rate.

Marc

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