From: Lucas Stach <l.stach@pengutronix.de> To: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: Shawn Guo <shawnguo@kernel.org>, Fabio Estevam <fabio.estevam@nxp.com>, Chris Healy <cphealy@gmail.com>, Leonard Crestez <leonard.crestez@nxp.com>, "A.s. Dong" <aisheng.dong@nxp.com>, Richard Zhu <hongxing.zhu@nxp.com>, linux-imx@nxp.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [RFC v2 3/5] arm64: dts: imx8mq: Combine PCIE power domains Date: Fri, 08 Feb 2019 10:45:17 +0100 [thread overview] Message-ID: <1549619117.2544.85.camel@pengutronix.de> (raw) In-Reply-To: <20190208002941.30343-4-andrew.smirnov@gmail.com> Am Donnerstag, den 07.02.2019, 16:29 -0800 schrieb Andrey Smirnov: > According to NXP's FAE feedback and a comment in ATF firmware, PCIE1 > and PCIE2 power domains can't really be used independently. Due to > shared reset line both power domains have to be turned on at the same > time. Account for that quirk by combining PCIE power domains into a > single 'pgc_pcie' power domain. > > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Fabio Estevam <fabio.estevam@nxp.com> > Cc: Chris Healy <cphealy@gmail.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Leonard Crestez <leonard.crestez@nxp.com> > Cc: "A.s. Dong" <aisheng.dong@nxp.com> > Cc: Richard Zhu <hongxing.zhu@nxp.com> > Cc: linux-imx@nxp.com > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org Nit below, otherwise: Reviewed-by: Lucas Stach <l.stach@pengutronix.de> > --- > arch/arm64/boot/dts/freescale/imx8mq.dtsi | 21 ++++++++++++++++++++- > 1 file changed, 20 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi > index 50436bd393ed..89babc531380 100644 > --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi > +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi > @@ -273,9 +273,28 @@ > reg = <IMX8M_POWER_DOMAIN_MIPI>; > }; > > - pgc_pcie1: power-domain@1 { > + /* > + * As per comment in ATF source code: > + * > + * PCIE1 and PCIE2 share the > + * same reset signal, if we > + * power down PCIE2, PCIE1 > + * will be held in reset too. > + * > + * So instead of creating two > + * separate power domains for > + * PCIE1 and PCIE2. We create > + * a link between 1 and 10 and 1 and 10 is not something that directly shows up in the DTS, so I think it could be confusing to the reader. I would just state that as "link between both" or something to that tune. > + * use what was supposed to be > + * domain 1 as a shared PCIE > + * power domain powering both > + * PCIE1 and PCIE2 at the same > + * time > + */ > + pgc_pcie: power-domain@1 { > #power-domain-cells = <0>; > reg = <IMX8M_POWER_DOMAIN_PCIE1>; > + power-domains = <&pgc_pcie2>; > }; > > pgc_otg1: power-domain@2 {
WARNING: multiple messages have this Message-ID (diff)
From: Lucas Stach <l.stach@pengutronix.de> To: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: "A.s. Dong" <aisheng.dong@nxp.com>, Richard Zhu <hongxing.zhu@nxp.com>, linux-kernel@vger.kernel.org, linux-imx@nxp.com, Fabio Estevam <fabio.estevam@nxp.com>, Leonard Crestez <leonard.crestez@nxp.com>, Shawn Guo <shawnguo@kernel.org>, Chris Healy <cphealy@gmail.com>, linux-arm-kernel@lists.infradead.org Subject: Re: [RFC v2 3/5] arm64: dts: imx8mq: Combine PCIE power domains Date: Fri, 08 Feb 2019 10:45:17 +0100 [thread overview] Message-ID: <1549619117.2544.85.camel@pengutronix.de> (raw) In-Reply-To: <20190208002941.30343-4-andrew.smirnov@gmail.com> Am Donnerstag, den 07.02.2019, 16:29 -0800 schrieb Andrey Smirnov: > According to NXP's FAE feedback and a comment in ATF firmware, PCIE1 > and PCIE2 power domains can't really be used independently. Due to > shared reset line both power domains have to be turned on at the same > time. Account for that quirk by combining PCIE power domains into a > single 'pgc_pcie' power domain. > > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Fabio Estevam <fabio.estevam@nxp.com> > Cc: Chris Healy <cphealy@gmail.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Leonard Crestez <leonard.crestez@nxp.com> > Cc: "A.s. Dong" <aisheng.dong@nxp.com> > Cc: Richard Zhu <hongxing.zhu@nxp.com> > Cc: linux-imx@nxp.com > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org Nit below, otherwise: Reviewed-by: Lucas Stach <l.stach@pengutronix.de> > --- > arch/arm64/boot/dts/freescale/imx8mq.dtsi | 21 ++++++++++++++++++++- > 1 file changed, 20 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi > index 50436bd393ed..89babc531380 100644 > --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi > +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi > @@ -273,9 +273,28 @@ > reg = <IMX8M_POWER_DOMAIN_MIPI>; > }; > > - pgc_pcie1: power-domain@1 { > + /* > + * As per comment in ATF source code: > + * > + * PCIE1 and PCIE2 share the > + * same reset signal, if we > + * power down PCIE2, PCIE1 > + * will be held in reset too. > + * > + * So instead of creating two > + * separate power domains for > + * PCIE1 and PCIE2. We create > + * a link between 1 and 10 and 1 and 10 is not something that directly shows up in the DTS, so I think it could be confusing to the reader. I would just state that as "link between both" or something to that tune. > + * use what was supposed to be > + * domain 1 as a shared PCIE > + * power domain powering both > + * PCIE1 and PCIE2 at the same > + * time > + */ > + pgc_pcie: power-domain@1 { > #power-domain-cells = <0>; > reg = <IMX8M_POWER_DOMAIN_PCIE1>; > + power-domains = <&pgc_pcie2>; > }; > > pgc_otg1: power-domain@2 { _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-08 9:45 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-08 0:29 [RFC v2 0/5] PCIE support for i.MX8MQ (DT changes) Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 0:29 ` [RFC v2 1/5] arm64: dts: imx8mq: Mark iomuxc_gpr as i.MX6Q compatible Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 9:40 ` Lucas Stach 2019-02-08 9:40 ` Lucas Stach 2019-02-08 0:29 ` [RFC v2 2/5] arm64: dts: imx8mq: Add a node for SRC IP block Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 9:41 ` Lucas Stach 2019-02-08 9:41 ` Lucas Stach 2019-02-08 0:29 ` [RFC v2 3/5] arm64: dts: imx8mq: Combine PCIE power domains Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 9:45 ` Lucas Stach [this message] 2019-02-08 9:45 ` Lucas Stach 2019-02-08 0:29 ` [RFC v2 4/5] arm64: dts: imx8mq: Add nodes for PCIe IP blocks Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 9:47 ` Lucas Stach 2019-02-08 9:47 ` Lucas Stach 2019-02-08 0:29 ` [RFC v2 5/5] arm64: dts: imx8mq-evk: Enable PCIE0 interface Andrey Smirnov 2019-02-08 0:29 ` Andrey Smirnov 2019-02-08 9:54 ` Lucas Stach 2019-02-08 9:54 ` Lucas Stach
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