linux-kernel - Re: [PATCH 1/3] clk: Add the flag CLK_ENABLE_MUTEX

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Message-ID: <02abeb64fb360245791b467b371f1491.sboyd@kernel.org>
Date:   Tue, 01 Aug 2023 12:18:40 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Luo Jie <quic_luoj@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, conor+dt@...nel.org,
        konrad.dybcio@...aro.org, krzysztof.kozlowski+dt@...aro.org,
        mturquette@...libre.com, p.zabel@...gutronix.de, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_srichara@...cinc.com, Luo Jie <quic_luoj@...cinc.com>
Subject: Re: [PATCH 1/3] clk: Add the flag CLK_ENABLE_MUTEX_LOCK of enabling clock

Quoting Luo Jie (2023-08-01 01:53:50)
> Support the clock controller where the HW register is
> accessed by MDIO bus, the spin lock can't be used because
> of sleep during the MDIO operation.
> 
> Add the flag CLK_ENABLE_MUTEX_LOCK to hint clock framework
> to use mutex lock instead of the spin lock.

Why can't you enable the MDIO bus clk in .prepare()?