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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Linux IOMMU <iommu@lists.linux-foundation.org>
Subject: RE: [PATCH 1/3] iommu/ipmmu-vmsa: Remove some unused register declarations
Date: Tue, 15 Oct 2019 05:17:25 +0000	[thread overview]
Message-ID: <TYAPR01MB4544CF27B1D041472CC5D5B8D8930@TYAPR01MB4544.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <CAMuHMdWfHYDOKSJBUCVLG6yNKxbv=jUd9E1B_fiBOQajwi_wEg@mail.gmail.com>

Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Friday, October 11, 2019 9:11 PM
> 
> Hi Shimoda-san,
> 
> Thanks for your patch!
> 
> On Wed, Oct 9, 2019 at 10:27 AM Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@renesas.com> wrote:
> > To support different registers memory mapping hardware easily
> > in the future, this patch removes some unused register
> > declarations.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Thank you for your review!

> While I can confirm the removed definitions are unused, they were
> still valid (but see comments below).
> Perhaps it would be better to add comments, to state clearly to which
> SoCs or SoC families they apply?  Or do you think this would be futile,
> and would add too much clutter to the source file in the near future?

I think adding comments to the declarations are better to avoid
incorrect implementation in the future. So, I'll make such an incremental patch.

> > --- a/drivers/iommu/ipmmu-vmsa.c
> > +++ b/drivers/iommu/ipmmu-vmsa.c
> > @@ -104,8 +104,6 @@ static struct ipmmu_vmsa_device *to_ipmmu(struct device *dev)
> >  #define IMCTR                          0x0000
> >  #define IMCTR_TRE                      (1 << 17)
> >  #define IMCTR_AFE                      (1 << 16)
> > -#define IMCTR_RTSEL_MASK               (3 << 4)
> 
> FWIW, this is valid for R-Car Gen2 only.  On R-Car Gen3, the field
> contains 3 bits.

That's correct.

Best regards,
Yoshihiro Shimoda

> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
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  reply	other threads:[~2019-10-15  5:17 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09  8:26 [PATCH 0/3] iommu/ipmmu-vmsa: minor updates Yoshihiro Shimoda
2019-10-09  8:26 ` [PATCH 1/3] iommu/ipmmu-vmsa: Remove some unused register declarations Yoshihiro Shimoda
2019-10-09 21:03   ` Niklas Söderlund
2019-10-11 12:10   ` Geert Uytterhoeven
2019-10-15  5:17     ` Yoshihiro Shimoda [this message]
2019-10-09  8:26 ` [PATCH 2/3] iommu/ipmmu-vmsa: Calculate context registers' offset instead of a macro Yoshihiro Shimoda
2019-10-09 21:13   ` Niklas Söderlund
2019-10-11 12:29   ` Geert Uytterhoeven
2019-10-15  5:28     ` Yoshihiro Shimoda
2019-10-09  8:26 ` [PATCH 3/3] iommu/ipmmu-vmsa: Add utlb_offset_base Yoshihiro Shimoda
2019-10-09 22:28   ` Niklas Söderlund
2019-10-11 12:32   ` Geert Uytterhoeven
2019-10-15  5:28     ` Yoshihiro Shimoda

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