[PATCH] video: stm32: remove all child of DSI bridge when its probe failed

[Patrick Delaunay]

From: Patrick Delaunay <patrick.delaunay at st.com>

Remove the child device of the STM32 DSI bridge when the driver probe
failed to stop futher probe request on panels used with STMicroelectronics
board (orisetech_otm8009a.c or raydium-rm68200.c driver).

This patch avoid the trace "cannot get reset GPIO" when
STM32MP157 device tree is used on stm32MP151 SOC without DSI support.

In this hw_version value is 0, as DSI bridge is absent and the panel
ofdata_to_platdata is called for each try of panel probe,
the gpio reset pin is requested but after dsi father probe failed).

For the next request, the PANEL ofdata_to_platdata failed as the gpio
is already used.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 drivers/video/stm32/stm32_dsi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/stm32/stm32_dsi.c b/drivers/video/stm32/stm32_dsi.c
index 8891ca4b78..4027e978c8 100644
--- a/drivers/video/stm32/stm32_dsi.c
+++ b/drivers/video/stm32/stm32_dsi.c
@@ -483,6 +483,9 @@ static int stm32_dsi_probe(struct udevice *dev)
 	if (priv->hw_version != HWVER_130 &&
 	    priv->hw_version != HWVER_131) {
 		dev_err(dev, "DSI version 0x%x not supported\n", priv->hw_version);
+		dev_dbg(dev, "remove and unbind all DSI child\n");
+		device_chld_remove(dev, NULL, DM_REMOVE_NORMAL);
+		device_chld_unbind(dev, NULL);
 		ret = -ENODEV;
 		goto err_clk;
 	}
-- 
2.17.1