RE: [PATCH v2 1/7] reset: imx7: Add the iMX8MP PCIe PHY PERST support

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> -----Original Message-----
> From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Sent: 2022年4月15日 4:48
> To: Hongxing Zhu <hongxing.zhu@xxxxxxx>; p.zabel@xxxxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; lorenzo.pieralisi@xxxxxxx; robh@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; vkoul@xxxxxxxxxx; alexander.stein@xxxxxxxxxxxxxxx
> Cc: linux-phy@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>
> Subject: Re: [PATCH v2 1/7] reset: imx7: Add the iMX8MP PCIe PHY PERST
> support
> 
> Am Montag, dem 07.03.2022 um 17:07 +0800 schrieb Richard Zhu:
> > Add the i.MX8MP PCIe PHY PERST support.
> 
> As Philipp said: please add some more description on why this is necessary. As
> far as I can see the reset is already present on 8MQ, and is low-active, like this
> patch claims. We just didn't handle this reset at all on other SoCs as the power
> on de-asserted state was okay to get things working.
>
Yes, it is.
I had asking the details from design team.
Would update the description after I get the more information.

Best Regards
Richard Zhu

> Regards,
> Lucas
> 
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
> > ---
> >  drivers/reset/reset-imx7.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> > index 185a333df66c..d2408725eb2c 100644
> > --- a/drivers/reset/reset-imx7.c
> > +++ b/drivers/reset/reset-imx7.c
> > @@ -329,6 +329,7 @@ static int imx8mp_reset_set(struct
> reset_controller_dev *rcdev,
> >  		break;
> >
> >  	case IMX8MP_RESET_PCIE_CTRL_APPS_EN:
> > +	case IMX8MP_RESET_PCIEPHY_PERST:
> >  		value = assert ? 0 : bit;
> >  		break;
> >  	}
> 





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