linux-kernel - Re: [PATCH v2 09/41] usb: gadget: s3c-hsudc: remove platform header dependency

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Message-ID: <20200809084407.GA7722@kozik-lap>
Date:   Sun, 9 Aug 2020 10:44:07 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Felipe Balbi <balbi@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 09/41] usb: gadget: s3c-hsudc: remove platform header
 dependency

On Fri, Aug 07, 2020 at 07:42:30PM +0200, Arnd Bergmann wrote:
> On Fri, Aug 7, 2020 at 3:59 PM Felipe Balbi <balbi@...nel.org> wrote:
> > Krzysztof Kozlowski <krzk@...nel.org> writes:
> 
> > > +#include <linux/delay.h>
> > > +
> > >  #define S3C2443_CLKREG(x)            ((x) + S3C24XX_VA_CLKPWR)
> > >
> > >  #define S3C2443_PLLCON_MDIVSHIFT     16
> > > @@ -184,5 +186,52 @@ s3c2443_get_epll(unsigned int pllval, unsigned int baseclk)
> > >       return (unsigned int)fvco;
> > >  }
> > >
> > > +static inline void s3c_hsudc_init_phy(void)
> >
> > This should, really, be a PHY driver under drivers/phy, since the goal
> > is to make this platform-independent, might as well take the opportunity
> > to introduce a proper driver, no?
> 
> In theory, this is absolutely correct. I fear it will be hard to find anyone
> to make a larger scale cleanup of the file however. As my old changelog
> text says, there is only one board (smdk2416) in the kernel that registers
> the device. My change was the minimum to keep it working during the
> move to a multiplatform configuration, but if there is someone who has
> the hardware and volunteers to make a proper phy driver, that would also
> work.
> 
> As the board only exists as a reference for other boards, but none of those
> made it into the kernel, we could alternatively just decide to drop the
> driver. There is also a .dts file for the board, which is lacking a device node
> for the udc (and the driver lacks DT support), so that board file could also
> be dropped then, leaving only the DT version as a reference for the SoC.

All this is a work on a very old SoC with an unknown number of
current/real users. I don't have the hardware to test so I would prefer
to skip any big changes. As Arnd suggests, we could just drop this one
board and the driver... or if it does not harm/bother to much we could
keep it as is, just without platform header dependency. Someone still
might be using it.

Best regards,
Krzysztof