linux-kernel - RE: [PATCH] clk: imx8qxp: Defer instead of failing probe

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Date: Mon, 1 Jul 2024 23:55:29 +0000
From: Peng Fan <peng.fan@....com>
To: Diogo Manuel Pais Silva <diogo.pais@...ontrol.com>, "abelvesa@...nel.org"
	<abelvesa@...nel.org>, "mturquette@...libre.com" <mturquette@...libre.com>,
	"sboyd@...nel.org" <sboyd@...nel.org>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com"
	<festevam@...il.com>, "linux-clk@...r.kernel.org"
	<linux-clk@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "EMC: linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] clk: imx8qxp: Defer instead of failing probe

> Subject: [PATCH] clk: imx8qxp: Defer instead of failing probe
> 
> When of_clk_parent_fill is run before all the parent clocks have been
> probed then the probe function will return -EINVAL, making it so that
> the probe isn't attempted again. As fw_devlink is on by default this
> does not usually happen, but if fw_devlink is disabled then it is very
> possible that the parent clock will be probed after the lpcg first attempt,
> and the lpcg clock will not work.
> 
> Signed-off-by: Diogo Silva <diogo.pais@...ontrol.com>
> ---
>  drivers/clk/imx/clk-imx8qxp-lpcg.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-
> imx8qxp-lpcg.c
> index d0ccaa040225..520a05ea0bef 100644
> --- a/drivers/clk/imx/clk-imx8qxp-lpcg.c
> +++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c
> @@ -225,8 +225,8 @@ static int imx_lpcg_parse_clks_from_dt(struct
> platform_device *pdev,
> 
>         ret = of_clk_parent_fill(np, parent_names, count);
>         if (ret != count) {
> -               dev_err(&pdev->dev, "failed to get clock parent names\n");
> -               return count;
> +               dev_warn(&pdev->dev, "failed to get all clock parent
> names\n");
> +               return -EPROBE_DEFER;

Use dev_err_probe?

Regards,
Peng.

>         }
> 
>         ret = of_property_read_string_array(np, "clock-output-names",
> --
> 2.34.1
> 
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