linux-kernel - Re: [PATCH 2/3] PCI: imx: Add multi-pd support

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Date:   Mon, 8 Oct 2018 11:26:59 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Stefan Agner <stefan@...er.ch>, Marek Vasut <marex@...x.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-pci@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, kernel@...gutronix.de
Subject: Re: [PATCH 2/3] PCI: imx: Add multi-pd support

On Mon, Oct 01, 2018 at 11:56:17PM +0300, Leonard Crestez wrote:
> On some chips the PCIE and PCIE_PHY blocks are in separate power domains
> which can be power-gated independently. The driver needs to handle this
> by keeping both domain active.
> 
> This is intended for imx6sx where PCIE is in DISPMIX and PCIE_PHY in
> it's own domain. Defining the DISPMIX domain requires a way for pcie to
> keep it active or it will break when displays are off.
> 
> The power-domains on imx6sx are meant to look like this:
> 	power-domains = <&pd_disp>, <&pd_pci>;
> 	power-domain-names = "pcie", "pcie_phy";
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 48 +++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)

Bindings document fsl,imx6q-pcie.txt should probably be updated for the
new power domain support.

Shawn