linux-kernel - Re: [PATCH v5 6/8] scsi: ufs: make the UFS variant a platform device

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Message-ID: <0619eb945f9dc1d4f5fb14bd2de7a101.squirrel@www.codeaurora.org>
Date:	Wed, 2 Sep 2015 16:03:47 -0000
From:	ygardi@...eaurora.org
To:	"Rob Herring" <robherring2@...il.com>
Cc:	"Yaniv Gardi" <ygardi@...eaurora.org>,
	"Jej B" <james.bottomley@...senpartnership.com>,
	"Paul Bolle" <pebolle@...cali.nl>, hch@...radead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	"linux-arm-msm" <linux-arm-msm@...r.kernel.org>,
	"Santosh Y" <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	"Subhash Jadavani" <subhashj@...eaurora.org>,
	"Gilad Broner" <gbroner@...eaurora.org>,
	"Dolev Raviv" <draviv@...eaurora.org>,
	"Rob Herring" <robh+dt@...nel.org>,
	"Pawel Moll" <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>,
	"Christoph Hellwig" <hch@....de>,
	"Sujit Reddy Thumma" <sthumma@...eaurora.org>,
	"Raviv Shvili" <rshvili@...eaurora.org>,
	"Sahitya Tummala" <stummala@...eaurora.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 6/8] scsi: ufs: make the UFS variant a platform
 device

> On Wed, Sep 2, 2015 at 3:32 AM, Yaniv Gardi <ygardi@...eaurora.org> wrote:
>> This change turns the UFS variant (SCSI_UFS_QCOM) into a UFS
>> a platform device.
>> In order to do so a few additional changes are required:
>> 1. The ufshcd-pltfrm is no longer serves as a platform device.
>>    Now it only serves as a group of platform APIs such as PM APIs
>>    (runtime suspend/resume, system suspend/resume etc), parsers of
>>    clocks, regulators and pm_levels from DT.
>> 2. What used to be the old platform "probe" is now "only"
>>    a pltfrm_init() routine, that does exactly the same, but only
>>    being called by the new probe function of the UFS variant.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> [...]
>
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index 329ac84..5179250 100644
>> --- a/drivers/scsi/ufs/ufs-qcom.c
>> +++ b/drivers/scsi/ufs/ufs-qcom.c
>> @@ -19,6 +19,7 @@
>>
>>  #include <linux/phy/phy-qcom-ufs.h>
>>  #include "ufshcd.h"
>> +#include "ufshcd-pltfrm.h"
>>  #include "unipro.h"
>>  #include "ufs-qcom.h"
>>  #include "ufshci.h"
>> @@ -1036,7 +1037,7 @@ void ufs_qcom_clk_scale_notify(struct ufs_hba
>> *hba)
>>   * The variant operations configure the necessary controller and PHY
>>   * handshake during initialization.
>>   */
>> -static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
>> +static struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
>>         .name                   = "qcom",
>>         .init                   = ufs_qcom_init,
>>         .exit                   = ufs_qcom_exit,
>> @@ -1050,4 +1051,75 @@ static const struct ufs_hba_variant_ops
>> ufs_hba_qcom_vops = {
>>         .resume                 = ufs_qcom_resume,
>>  };
>>
>> +/**
>> + * 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)
>> +{
>> +       int err;
>> +       struct device *dev = &pdev->dev;
>> +       struct ufs_hba *hba;
>> +
>> +       /* Perform generic probe */
>> +       err = ufshcd_pltfrm_init(pdev, &ufs_hba_qcom_vops);
>> +       if (err) {
>> +               dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
>> +               goto out;
>> +       }
>> +
>
> All of this:
>
>> +       hba = platform_get_drvdata(pdev);
>> +
>> +       return 0;
>> +
>> +dealloc_host:
>> +       /* disconnect the bind between the qcom host and the hba */
>> +       ufshcd_set_variant(hba, NULL);
>> +       ufshcd_dealloc_host(hba);
>
> To this is dead code. You should get a warning that dealloc_host is
> unused. Please check and fix all warnings.
>
> Rob
>

correct. V7 has taken care of that.
thanks,
Yaniv

>> +out:
>> +       return err;
>> +}
>> +
> --
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