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arm64: dts: imx8mq: Combine PCIE power domains

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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>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Fabio Estevam <festevam@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
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Andrey Smirnov 2019-04-05 10:30:02 -07:00 committed by Shawn Guo
parent d62a250ea3
commit de2a538b97
1 changed files with 17 additions and 1 deletions
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18
arch/arm64/boot/dts/freescale/imx8mq.dtsi
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@ -472,9 +472,25 @@ pgc_mipi: power-domain@0 {
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 both and use
* it as a shared PCIE power
* domain.
*/
pgc_pcie: power-domain@1 {
#power-domain-cells = <0>;
reg = <IMX8M_POWER_DOMAIN_PCIE1>;
power-domains = <&pgc_pcie2>;
};
pgc_otg1: power-domain@2 {