Messages in this thread |  | | Date | Thu, 4 Jun 2015 20:42:58 -0000 | Subject | Re: [PATCH v2 4/4] scsi: ufs: probe and init of variant driver from the platform device | From | ygardi@codeauro ... |
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> On Wed, 2015-06-03 at 12:37 +0300, Yaniv Gardi wrote: >> --- a/drivers/scsi/ufs/ufs-qcom.c >> +++ b/drivers/scsi/ufs/ufs-qcom.c > >> EXPORT_SYMBOL(ufs_hba_qcom_vops); > > Nothing uses this export. It's still a (static) symbol that is not > included in any header. I think this export serves no purpose. Am I > missing something subtle here? >
correct Paul. I will remove it.
>> +/** >> + * ufs_qcom_probe - probe routine of the driver >> + * @pdev: pointer to Platform device handle >> + * >> + * Always return 0 >> + */ >> +static int ufs_qcom_probe(struct platform_device *pdev) >> +{ >> + dev_set_drvdata(&pdev->dev, (void *)&ufs_hba_qcom_vops); > > (Cast to void * should not be needed.) > >> + return 0; >> +} >> + >> +/** >> + * ufs_qcom_remove - set driver_data of the device to NULL >> + * @pdev: pointer to platform device handle >> + * >> + * Always return 0 >> + */ >> +static int ufs_qcom_remove(struct platform_device *pdev) >> +{ >> + dev_set_drvdata(&pdev->dev, NULL); >> + return 0; >> +} >> + >> +static const struct of_device_id ufs_qcom_of_match[] = { >> + { .compatible = "qcom,ufs_variant"}, >> + {}, >> +}; >> + >> +static struct platform_driver ufs_qcom_pltform = { >> + .probe = ufs_qcom_probe, >> + .remove = ufs_qcom_remove, >> + .driver = { >> + .name = "ufs_qcom", >> + .owner = THIS_MODULE, >> + .of_match_table = of_match_ptr(ufs_qcom_of_match), >> + }, >> +}; >> +module_platform_driver(ufs_qcom_pltform); > >> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c >> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c > >> + struct device_node *node = pdev->dev.of_node; >> + struct device_node *ufs_variant_node; >> + struct platform_device *ufs_variant_pdev; > >> - 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); > > (Another cast that I think is not needed.) > >> + } > > If I scanned this correctly, the dev_set_drvdata() and dev_get_drvdata() > pair adds an actual user of ufs_hba_qcom_vops. So that ends the obvious > issue I think the code currently has. And I gladly defer to the scsi > people to determine whether that is done the right way. >
yes, you got it right. these 2 routines use the vops structure, that binds the driver and the variant (in our case qcom)
thanks for your time, Paul
> Thanks, > > > Paul Bolle > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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