linux-kernel - Re: [PATCH v2 1/7] reset: imx7: Add the iMX8MP PCIe PHY PERST support

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Message-ID: <837af8d131bd0674d7466d89c3df74da08c8c435.camel@pengutronix.de>
Date:   Thu, 14 Apr 2022 22:48:15 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Richard Zhu <hongxing.zhu@....com>, p.zabel@...gutronix.de,
        bhelgaas@...gle.com, lorenzo.pieralisi@....com, robh@...nel.org,
        shawnguo@...nel.org, vkoul@...nel.org,
        alexander.stein@...tq-group.com
Cc:     linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        linux-imx@....com
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.

Regards,
Lucas

> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  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;
>  	}