Hi Fabio,
On Thu, 2018-03-01 at 13:43 -0300, Fabio Estevam wrote:
> On Thu, Mar 1, 2018 at 1:27 PM, Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> wrote:
>
> > Oh, this only works for csi ports that have pinctrl in their csi port
> > node, like:
> >
> > &ipu1_csi0 {
> > pinctrl-names = "default";
> > pinctrl-0 = <&pinctrl_ipu1_csi0>;
> > };
>
> This is the case for imx6qdl-sabresd.dtsi and even in this case
> devm_pinctrl_get_select_default() fails
>
> > pinctrl would have to be moved out of the csi port nodes, for example
> > into their parent ipu nodes, or maybe more correctly, into the video mux
> > nodes in each device tree.
>
> Tried it like this:
>
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -154,12 +154,9 @@
> };
>
> &ipu1_csi0_mux_from_parallel_sensor {
> - remote-endpoint = <&ov5642_to_ipu1_csi0_mux>;
> -};
> -
> -&ipu1_csi0 {
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_ipu1_csi0>;
> + remote-endpoint = <&ov5642_to_ipu1_csi0_mux>;
> };
>
> &mipi_csi {
>
>
> but still get the devm_pinctrl_get_select_default() failure.
Yes, this would still require to ignore the pinctrl error in the CSI
driver.
I just think that this is might be more correct, since the external pins
are directly connected to the mux input port.
> I was not able to change the dts so that
> devm_pinctrl_get_select_default() succeeds.
>
> If you agree I can send the following change:
>
> diff --git a/drivers/staging/media/imx/imx-media-csi.c
> b/drivers/staging/media/imx/imx-media-csi.c
> index 5a195f8..c40f786 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -1797,11 +1797,8 @@ static int imx_csi_probe(struct platform_device *pdev)
> */
> priv->dev->of_node = pdata->of_node;
> pinctrl = devm_pinctrl_get_select_default(priv->dev);
> - if (IS_ERR(pinctrl)) {
> - ret = PTR_ERR(priv->vdev);
> - goto free;
> - }
> -
> + if (IS_ERR(pinctrl))
> + dev_dbg(priv->dev, "pintrl_get_select_default() failed\n");
I would add the error code to the debug print.
> ret = v4l2_async_register_subdev(&priv->sd);
> if (ret)
> goto free;
>
> So that the error is ignored and we still can change the pinctrl values via dts.
>
> What do you think?
Maybe we should still throw the error if it is anything other than
-ENODEV (which we expect in case there is no pinctrl property in the csi
port node):
if (IS_ERR(pinctrl)) {
ret = PTR_ERR(pinctrl);
dev_dbg(priv->dev, "pinctrl_get_select_default() failed: %d\n",
ret);
if (ret != -ENODEV)
goto free;
}
regards
Philipp
