linux-kernel - Re: R: [PATCH] ARM: qcom: Disable i2c device on gsbi4 for ipq806x

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Date:   Fri, 13 Mar 2020 16:46:57 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     ansuelsmth@...il.com
Cc:     'Stephen Boyd' <sboyd@...nel.org>, agross@...nel.org,
        'Mathieu Olivari' <mathieu@...eaurora.org>,
        'Rob Herring' <robh+dt@...nel.org>,
        'Mark Rutland' <mark.rutland@....com>,
        'Michael Turquette' <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: R: [PATCH] ARM: qcom: Disable i2c device on gsbi4 for ipq806x

On Fri 13 Mar 15:34 PDT 2020, ansuelsmth@...il.com wrote:

> > Quoting Ansuel Smith (2020-03-13 12:58:16)
> > > diff --git a/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
> > b/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
> > > index 554c65e7aa0e..580aec63030d 100644
> > > --- a/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
> > > +++ b/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
> > > @@ -21,14 +21,5 @@ mux {
> > >                                 };
> > >                         };
> > >                 };
> > > -
> > > -               gsbi@...00000 {
> > > -                       i2c@...80000 {
> > > -                               status = "ok";
> > > -                               clock-frequency = <200000>;
> > > -                               pinctrl-0 = <&i2c4_pins>;
> > > -                               pinctrl-names = "default";
> > > -                       };
> > > -               };
> > >         };
> > >  };
> > > diff --git a/drivers/clk/qcom/gcc-ipq806x.c b/drivers/clk/qcom/gcc-
> > ipq806x.c
> > > index b0eee0903807..75706807e6cf 100644
> > > --- a/drivers/clk/qcom/gcc-ipq806x.c
> > > +++ b/drivers/clk/qcom/gcc-ipq806x.c
> > > @@ -782,7 +782,7 @@ static struct clk_rcg gsbi4_qup_src = {
> > >                         .parent_names = gcc_pxo_pll8,
> > >                         .num_parents = 2,
> > >                         .ops = &clk_rcg_ops,
> > > -                       .flags = CLK_SET_PARENT_GATE,
> > > +                       .flags = CLK_SET_PARENT_GATE | CLK_IGNORE_UNUSED,
> > 
> > A better solution is to use the protected-clocks property so we don't
> > try to touch these clks at all on this device. So this whole patch can
> > be routed through arm-soc and remove the i2c node and add some dt
> > property to the gcc node.
> > 
> 
> Should I add a comment where the i2c is removed or I can remove it
> directly?
> 

It's fine that you just remove it, like you proposed above.

The commit message should describe the reason and per your description I
don't expect that anyone will miss the node...

Regards,
Bjorn

> > >                 },
> > >         },
> > >  };
>