linux-kernel - Re: [PATCH v2 1/4] crypto: caam - do not initialise clocks on the i.MX8

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Message-ID: <CAHQ1cqGcDm6MGnmn3=SKBYNkToP_T+-SEHSvOBtq8FGcRoTb6Q@mail.gmail.com>
Date:   Tue, 11 Jun 2019 19:01:16 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Horia Geanta <horia.geanta@....com>
Cc:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Chris Spencer <christopher.spencer@....co.uk>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Cory Tusar <cory.tusar@....aero>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Abel Vesa <abel.vesa@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] crypto: caam - do not initialise clocks on the i.MX8

On Tue, Jun 11, 2019 at 2:56 AM Horia Geanta <horia.geanta@....com> wrote:
>
> On 6/7/2019 11:03 PM, Andrey Smirnov wrote:
> > From: Chris Spencer <christopher.spencer@....co.uk>
> >
> > There are no clocks that the CAAM driver needs to initialise on the
> > i.MX8.
> >
> RM lists 5 clocks for CAAM module (instance.clock): caam.aclk, caam.ipg_clk,
> caam.ipg_clk_s, caam_exsc.aclk_exsc, caam_mem.clk
>
> Wouldn't it be better to have these clocks in DT, instead of relying that their
> root clocks (ccm_ahb_clk_root, ccm_ipg_clk_root) are critical / always on?
>

Is it even possible to use the SoC in a meaningful way if
ccm_ahb_clk_root or ccm_ipg_clk_root are disabled? It doesn't seem
that dependency on either is expressed in a consistent manner for
other IP blocks in imx8mq.dtsi. OTOH, it should be trivial to add
<&clk IMX8MQ_CLK_IPG_ROOT> and <&clk IMX8MQ_CLK_AHB> as "ipg" and
"aclk" to CAAM node and it would allow me to drop an extra patch from
the series, so I may as well do it.

Thanks,
Andrey Smirnov