linux-kernel - Re: [PATCH 01/13] clk: qcom: gcc: limit GPLL0_AO

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Date:   Fri, 21 Dec 2018 22:45:41 +0100
From:   Jorge Ramirez <jorge.ramirez-ortiz@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Taniya Das <tdas@...eaurora.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, will.deacon@....com,
        mturquette@...libre.com, jassisinghbrar@...il.com,
        vkoul@...nel.org, niklas.cassel@...aro.org, sibis@...eaurora.org,
        georgi.djakov@...aro.org, arnd@...db.de,
        horms+renesas@...ge.net.au, heiko@...ech.de,
        enric.balletbo@...labora.com, jagan@...rulasolutions.com,
        olof@...om.net, amit.kucheria@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 01/13] clk: qcom: gcc: limit GPLL0_AO_OUT operating
 frequency

On 12/21/18 22:40, Stephen Boyd wrote:
> Quoting Jorge Ramirez (2018-12-21 11:45:28)
>> On 12/21/18 20:28, Bjorn Andersson wrote:
>>> Perhaps there's a better way to define that this particular clock
>>> hardware can change rate, but in this implementation it must not?
>> the initialization for this particular PLL on this particular platform
>> is wrong
>> as the interface does not apply to the platform needs even though it is an
>> alpha_pll
>>
>> if the VCO is not an option -even though it reflects the platform
>> constrains-
>> I would suggest nullifying the alpha_pll_ops that do not apply to this
>> platform:
>> ie: set_rate, round_rate set to null in the probe.
>>
>> allowing the interface calls (ops) to go through to later on make them fail
>> based on some setting would be fundamentally wrong IMO
>>
> We have clk_alpha_pll_postdiv_ro_ops so maybe just add another set of
> those for the alpha_pll itself?
>
>

something like  clk_alpha_pll_fixed_ops?