linux-kernel - Re: [PATCH 01/14] ata: ahci-platform: add reset control support and the flag to specify using reset

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Message-Id: <20180822190622.9750.4A936039@socionext.com>
Date:   Wed, 22 Aug 2018 19:06:22 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     Tejun Heo <tj@...nel.org>, Hans de Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-ide@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 01/14] ata: ahci-platform: add reset control support and the flag to specify using reset

Hi Sergei,

On Wed, 22 Aug 2018 12:34:30 +0300 <sergei.shtylyov@...entembedded.com> wrote:

> Hello!
> 
> On 8/22/2018 10:36 AM, Kunihiko Hayashi wrote:
> 
> > Add support to get and control a list of resets for the device
> > as optional and shared. These resets must be kept de-asserted until
> > the device is enabled.
> > > This is specified as shared because some SoCs like UniPhier series
> > have common reset controls with all ahci controller instances.
> > > However, according to Thierry's view,
> > https://www.spinics.net/lists/linux-ide/msg55357.html
> > some hardware-specific drivers already use their own resets,
> > and the common reset make a path to occur double controls of resets.
> > > Now this add the flag to ahci_platform_get_resources() indicating
> > whether to use the resources, currently resets only, and existing
> > drivers set 0 to this flags.
> > > Suggested-by: Hans de Goede <hdegoede@...hat.com>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> [...]
> 
> > diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h
> > index 1b0a17b..eaedca5f 100644
> > --- a/include/linux/ahci_platform.h
> > +++ b/include/linux/ahci_platform.h
> > @@ -30,7 +30,7 @@ void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv);
> >   int ahci_platform_enable_resources(struct ahci_host_priv *hpriv);
> >   void ahci_platform_disable_resources(struct ahci_host_priv *hpriv);
> >   struct ahci_host_priv *ahci_platform_get_resources(
> > -	struct platform_device *pdev);
> > +	struct platform_device *pdev, unsigned int flags);
> 
>     That breaks all the users of this API. You should fix the callers in this same patch to avoid breakage.

Thank you for your point.
Indeed, these splitted patches break git bisect. I'll fix it.

---
Best Regards,
Kunihiko Hayashi