linux-kernel - Re: [PATCH v3 6/9] clk: qcom: gcc-msm8994: Remove the inexistent GDSC

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Message-ID: <20210906100156.jvdn3hjtot4c6uaq@Marijn-Arch-PC.localdomain>
Date:   Mon, 6 Sep 2021 12:01:56 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        jamipkettunen@...ainline.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/9] clk: qcom: gcc-msm8994: Remove the inexistent
 GDSC_PCIE

On 2021-09-04 20:30:10, Konrad Dybcio wrote:
> This GDSC is not present on msm8994.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
> [no changes since v2]
> 
>  drivers/clk/qcom/gcc-msm8994.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-msm8994.c b/drivers/clk/qcom/gcc-msm8994.c
> index 98b2fd429629..2ed206ecb60d 100644
> --- a/drivers/clk/qcom/gcc-msm8994.c
> +++ b/drivers/clk/qcom/gcc-msm8994.c
> @@ -2485,14 +2485,6 @@ static struct clk_branch gcc_prng_ahb_clk = {
>  	},
>  };
>  
> -static struct gdsc pcie_gdsc = {
> -		.gdscr = 0x1e18,
> -		.pd = {
> -			.name = "pcie",
> -		},
> -		.pwrsts = PWRSTS_OFF_ON,
> -};
> -
>  static struct gdsc pcie_0_gdsc = {
>  		.gdscr = 0x1ac4,
>  		.pd = {
> @@ -2682,7 +2674,8 @@ static struct clk_regmap *gcc_msm8994_clocks[] = {
>  };
>  
>  static struct gdsc *gcc_msm8994_gdscs[] = {
> -	[PCIE_GDSC] = &pcie_gdsc,
> +	/* This GDSC does not exist, but ABI has to remain intact */
> +	[PCIE_GDSC] = NULL,

You could possibly leave this out since unspecified array elements are
always initialized to NULL, and place the comment on the #define of
PCIE_GDSC in the dt-bindings header instead?

Alternatively you could rename that define to PCIE_GDSC_DEPRECATED so
that any (out of tree) DT referencing it will be alerted of this change
at compile-time instead of finding a NULL-gdsc at runtime?

>  	[PCIE_0_GDSC] = &pcie_0_gdsc,
>  	[PCIE_1_GDSC] = &pcie_1_gdsc,
>  	[USB30_GDSC] = &usb30_gdsc,
> -- 
> 2.33.0
>