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

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Message-ID: 
 <DU0PR01MB93828B0E6808E33C608BC0E29DD32@DU0PR01MB9382.eurprd01.prod.exchangelabs.com>
Date: Mon, 1 Jul 2024 11:54:13 +0000
From: Diogo Manuel Pais Silva <diogo.pais@...ontrol.com>
To: "abelvesa@...nel.org" <abelvesa@...nel.org>,
        "peng.fan@....com"
	<peng.fan@....com>,
        "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: [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;
        }

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


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