Re: [PATCH v2 4/4] scsi: ufs: probe and init of variant driver from the platform device

[Akinobu Mita <akinobu.mita@gmail.com>]

Hi Yaniv,

2015-06-03 18:37 GMT+09:00 Yaniv Gardi <ygardi@codeaurora.org>:
> @@ -321,7 +313,22 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
>                 goto out;
>         }
>
> -       hba->vops = get_variant_ops(&pdev->dev);
> +       err = of_platform_populate(node, NULL, NULL, &pdev->dev);
> +       if (err)
> +               dev_err(&pdev->dev,
> +                       "%s: of_platform_populate() failed\n", __func__);
> +
> +       ufs_variant_node = of_get_next_available_child(node, NULL);
> +
> +       if (!ufs_variant_node) {
> +               dev_dbg(&pdev->dev, "failed to find ufs_variant_node child\n");
> +       } else {
> +               ufs_variant_pdev = of_find_device_by_node(ufs_variant_node);
> +
> +               if (ufs_variant_pdev)
> +                       hba->vops = (struct ufs_hba_variant_ops *)
> +                               dev_get_drvdata(&ufs_variant_pdev->dev);
> +       }

I have no strong objection to 'ufs_variant' sub-node.  But why can't we
simply add an of_device_id to ufs_of_match, like below:

static const struct of_device_id ufs_of_match[] = {
        { .compatible = "jedec,ufs-1.1"},
#if IS_ENABLED(SCSI_UFS_QCOM)
        { .compatible = "qcom,ufs", .data = &ufs_hba_qcom_vops },
#neidf
        {},
};

and get hba->vops by get_variant_ops()?

There is something similar in
drivers/net/ethernet/freescale/fsl_pq_mdio.c