[PATCH v3] soc: imx: imx8m-blk-ctrl: Defer probe if 'bus' genpd is not yet ready

From: Benjamin Gaignard
Date: Mon Sep 19 2022 - 08:13:25 EST


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@xxxxxxxxxxxxx>
---
v3:
- only return -EPROBE_DEFER if 'bus' device hasn't be found.

v2:
- keep dev_err_probe only change the return value.

drivers/soc/imx/imx8m-blk-ctrl.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
index dff7529268e4..1c195e9e8895 100644
--- a/drivers/soc/imx/imx8m-blk-ctrl.c
+++ b/drivers/soc/imx/imx8m-blk-ctrl.c
@@ -214,9 +214,14 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev)
return -ENOMEM;

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),
- "failed to attach power domain \"bus\"\n");
+ if (IS_ERR(bc->bus_power_dev)) {
+ if (PTR_ERR(bc->bus_power_dev) == -ENODEV)
+ return dev_err_probe(dev, -EPROBE_DEFER,
+ "failed to attach power domain \"bus\"\n");
+ else
+ return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev),
+ "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];
--
2.32.0