linux-kernel - [PATCH v2] soc: imx: imx8m-blk-ctrl: Defer probe if 'bus' genpd is not yet ready

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Message-Id: <20220913101747.60891-1-benjamin.gaignard@collabora.com>
Date:   Tue, 13 Sep 2022 12:17:47 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v2] soc: imx: imx8m-blk-ctrl: Defer probe if 'bus' genpd is not yet ready

Depending of the boot sequence 'bus' genpd could be probed after imx8m-blk-ctrl
which led driver probe to fail. Change the returned error to allow
to defer the probe in this case.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
v2:
- keep dev_err_probe only change the return value
 
 drivers/soc/imx/imx8m-blk-ctrl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
index dff7529268e4..253d08de8923 100644
--- a/drivers/soc/imx/imx8m-blk-ctrl.c
+++ b/drivers/soc/imx/imx8m-blk-ctrl.c
@@ -215,9 +215,10 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev)
 
 	bc->bus_power_dev = genpd_dev_pm_attach_by_name(dev, "bus");
 	if (IS_ERR(bc->bus_power_dev))
-		return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev),
+		return dev_err_probe(dev, -EPROBE_DEFER,
 				     "failed to attach power domain \"bus\"\n");
 
+
 	for (i = 0; i < bc_data->num_domains; i++) {
 		const struct imx8m_blk_ctrl_domain_data *data = &bc_data->domains[i];
 		struct imx8m_blk_ctrl_domain *domain = &bc->domains[i];
-- 
2.32.0