linux-kernel - RE: [PATCH 2/3] usb: renesas_usbhs: Enable support for more than two clks

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Date:   Thu, 1 Jul 2021 11:34:24 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Adam Ford <aford173@...il.com>
CC:     USB list <linux-usb@...r.kernel.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH 2/3] usb: renesas_usbhs: Enable support for more than two
 clks

Hi Adam, Geert-san,

> From: Geert Uytterhoeven, Sent: Thursday, July 1, 2021 6:07 PM
<snip>
> To: Adam Ford <aford173@...il.com>
> Cc: USB list <linux-usb@...r.kernel.org>; Adam Ford-BE <aford@...conembedded.com>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; Rob Herring <robh+dt@...nel.org>; Magnus Damm <magnus.damm@...il.com>; Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@...esas.com>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
> <devicetree@...r.kernel.org>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; Linux-Renesas
> <linux-renesas-soc@...r.kernel.org>
> Subject: Re: [PATCH 2/3] usb: renesas_usbhs: Enable support for more than two clks
> 
> Hi Adam,
> 
> Thanks for your patch!
> 
> On Wed, Jun 30, 2021 at 7:30 PM Adam Ford wrote:
<snip>
> > diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
> > index 3af91b2b8f76..255e4bd68ed3 100644
> > --- a/drivers/usb/renesas_usbhs/common.c
> > +++ b/drivers/usb/renesas_usbhs/common.c
<snip>
> > @@ -309,11 +311,13 @@ static int usbhsc_clk_get(struct device *dev, struct usbhs_priv *priv)
> >          * To backward compatibility with old DT, this driver checks the return
> >          * value if it's -ENOENT or not.
> >          */
> > -       priv->clks[1] = of_clk_get(dev_of_node(dev), 1);
> > -       if (PTR_ERR(priv->clks[1]) == -ENOENT)
> > -               priv->clks[1] = NULL;
> > -       else if (IS_ERR(priv->clks[1]))
> > -               return PTR_ERR(priv->clks[1]);
> > +       for (i = 1; i < ARRAY_SIZE(priv->clks); i++) {
> > +               priv->clks[1] = of_clk_get(dev->of_node, i);

s/clks[1]/[i]/

> > +               if (PTR_ERR(priv->clks[i]) == -ENOENT)
> > +                       priv->clks[i] = NULL;
> > +               else if (IS_ERR(priv->clks[i]))
> > +                       return PTR_ERR(priv->clks[i]);
> > +       }
> 
> This is identical to the current code, as ARRAY_SIZE(priv->clks) == 2.
> Probably you wanted to increase usbhs_priv.clks[], too?

I think so.
# I realized the clks array is only 2, so that this driver cannot
# enable usb2_clksel...

> Does it make sense to start using the clk_bulk*() API?

clk_bulk*() API seems to need clock-names property.
Is my understanding correct? However, the hsusb nodes doesn't
have the property for now...

Best regards,
Yoshihiro Shimoda