linux-kernel - [PATCH v5 3/5] arm64: dts: imx8mq: Combine PCIE power domains

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Message-Id: <20190405173004.13277-4-andrew.smirnov@gmail.com>
Date:   Fri,  5 Apr 2019 10:30:02 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Chris Healy <cphealy@...il.com>,
        Leonard Crestez <leonard.crestez@....com>,
        "A.s. Dong" <aisheng.dong@....com>,
        Richard Zhu <hongxing.zhu@....com>, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 3/5] arm64: dts: imx8mq: Combine PCIE power domains

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@...il.com>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
Reviewed-by: Fabio Estevam <festevam@...il.com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Leonard Crestez <leonard.crestez@....com>
Cc: "A.s. Dong" <aisheng.dong@....com>
Cc: Richard Zhu <hongxing.zhu@....com>
Cc: linux-imx@....com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 arch/arm64/boot/dts/freescale/imx8mq.dtsi | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 83d023aaa048..a85c3bef66c2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -472,9 +472,25 @@
 						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 {
-- 
2.20.1