RE: [PATCH v4 0/7] treewide: scsi: ufs: Add support for Renesas R-Car UFS controller

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Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Tuesday, April 26, 2022 12:32 AM
> 
> Hi Shimoda-san,
> 
> On Wed, Apr 20, 2022 at 8:17 AM Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> > This patch series adds support Renesas R-Car S4-8 UFS controller.
> 
> Thanks for your series!
> 
> > This controller has some restrictions so adds some quirks for it.
> > Before using this driver, we have to initialize a clock generator
> > on the environment board (named "Spider") by using the commands of
> > U-Boot like below:
> >  => i2c dev 0
> >  => i2c mw 0x6c 0x26 0x05
> >  => i2c olen 0x6c 2
> >  => i2c mw 0x6c 0x26c 0x2e
> 
> You mean we need a driver for the RC21212 clock generator? ;-)

You're correct.
# JFYI, the Spider has RC21012 instead of RC21212 for some reasons.

> Or the boot loader should program the clock generator, like is done
> on other R-Car boards for e.g. the PCIe clock (BTW, RC21212 also
> generates the PCIe clock on Spider)?

I think so because the clock generator specification is complex.
The RC21012 also generates the PCIe clock and Ethernet on Spider.

Best regards,
Yoshihiro Shimoda





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