linux-kernel - Re: [PATCH 4/6] clk: qcom: apss-ipq6018: add MODULE

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Date:   Mon, 11 Jul 2022 14:45:46 +0200
From:   Robert Marko <robimarko@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org, sivaprak@...eaurora.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-clk@...r.kernel.org,
        Devicetree List <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] clk: qcom: apss-ipq6018: add MODULE_ALIAS

On Mon, 11 Jul 2022 at 14:02, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 11/07/2022 13:46, Robert Marko wrote:
> > On Mon, 11 Jul 2022 at 13:05, Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> On 11/07/2022 12:47, Robert Marko wrote:
> >>> Add MODULE_ALIAS so that driver will be autoloaded if built as a module.
> >>>
> >>> Signed-off-by: Robert Marko <robimarko@...il.com>
> >>> ---
> >>>  drivers/clk/qcom/apss-ipq6018.c | 1 +
> >>>  1 file changed, 1 insertion(+)
> >>>
> >>> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
> >>> index f2f502e2d5a4..963c69f2c0c2 100644
> >>> --- a/drivers/clk/qcom/apss-ipq6018.c
> >>> +++ b/drivers/clk/qcom/apss-ipq6018.c
> >>> @@ -101,5 +101,6 @@ static struct platform_driver apss_ipq6018_driver = {
> >>>
> >>>  module_platform_driver(apss_ipq6018_driver);
> >>>
> >>> +MODULE_ALIAS("platform:qcom,apss-ipq6018-clk");
> >>
> >> That's not correct alias (no commas) and usually alias is not needed at
> >> all. If you need one, please explain why it is needed. Module
> >> autoloading works fine without aliases...
> >
> > Hi Krzysztof,
> > alias is required here as the driver does not use a DT compatible but
> > is registered
> > by the APCS driver, if built as a module, it won't get autoloaded
> > without an alias.
>
> Instead you need device ID table. Aliases are not a workaround for
> missing core driver elements.

Thanks for pointing this out, it looks like a proper solution for this.
I will drop this patch and fix up autoloading after this series gets merged
as APCS also requires a fixup, especially since the name in the platform
table is limited to 20 characters and the current name does not fit.
>
> >
> > I can only fix up the driver name here and in APCS first to have an
> > alias without commas.
>
> I see that the comma is used in driver name, so this is an independent
> issue. Maybe change it to '-' in separate commit?

Like with the previous point, I will drop this patch and fix it after
this series gets merged.

Regards,
Robert
>
>
> Best regards,
> Krzysztof