linux-kernel - Re: [PATCH v4 6/8] scsi: ufs: make the UFS variant a platform device

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Message-ID: <CAL_JsqJ2w3Czutb7vkT5Mt0Fs5jG_Lsm82-SD0Oe511X5-68Eg@mail.gmail.com>
Date:	Tue, 1 Sep 2015 15:43:09 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Yaniv Gardi <ygardi@...eaurora.org>
Cc:	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 v4 6/8] scsi: ufs: make the UFS variant a platform device

On Sun, Aug 30, 2015 at 9:52 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>
>
> ---
>  Documentation/devicetree/bindings/ufs/ufs-qcom.txt | 57 ++++++++++++++
>  .../devicetree/bindings/ufs/ufshcd-pltfrm.txt      |  4 +-

For the binding:

Reviewed-by: Rob Herring <robh@...nel.org>

A comment on the driver part still.

> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index 329ac84..8027435 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c

[...]

> +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;
> +       }
> +
> +       hba = platform_get_drvdata(pdev);

I thought this was not necessary?

> +       if (unlikely(!hba)) {
> +               dev_err(dev, "no hba structure after successful probing\n");
> +               goto dealloc_host;
> +       }
> +
> +       return 0;
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