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From: Adriana Kobylak <anoo@linux.ibm.com>
To: joel@jms.id.au, linux-arm-kernel@lists.infradead.org,
	linux-aspeed@lists.ozlabs.org
Cc: spinler@us.ibm.com, derekh@us.ibm.com, openbmc@lists.ozlabs.org,
	Adriana Kobylak <anoo@us.ibm.com>,
	bjwyman@gmail.com, shawnmm@us.ibm.com
Subject: [PATCH v2] ARM: dts: aspeed: rainier: Add N_MODE_VREF gpio
Date: Fri, 10 Sep 2021 19:54:17 +0000	[thread overview]
Message-ID: <20210910195417.2838841-1-anoo@linux.ibm.com> (raw)

From: Adriana Kobylak <anoo@us.ibm.com>

The N_MODE_VREF gpio is designed to be used to specify how many power
supplies the system should have (2 or 4).  If enough power supplies fail
so that the system no longer has redundancy (no longer n+1), the
hardware will signal to the Onboard Chip Controller that the system may
be oversubscribed, and performance may need to be reduced so the system
can maintain it's powered on state. This gpio is on a 9552, populate all
the gpios on that chip for completeness.

Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
---

v2: Update commit message.

 arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts | 103 +++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
index 6fd3ddf97a21..d5eea86dc260 100644
--- a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
@@ -1502,6 +1502,109 @@ eeprom@51 {
 		reg = <0x51>;
 	};
 
+	pca_pres3: pca9552@60 {
+		compatible = "nxp,pca9552";
+		reg = <0x60>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		gpio-controller;
+		#gpio-cells = <2>;
+
+		gpio-line-names =
+			"",
+			"APSS_RESET_N",
+			"", "", "", "",
+			"P10_DCM0_PRES",
+			"P10_DCM1_PRES",
+			"", "",
+			"N_MODE_CPU_N",
+			"",
+			"PRESENT_VRM_DCM0_N",
+			"PRESENT_VRM_DCM1_N",
+			"N_MODE_VREF",
+			"";
+
+		gpio@0 {
+			reg = <0>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@1 {
+			reg = <1>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@2 {
+			reg = <2>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@3 {
+			reg = <3>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@4 {
+			reg = <4>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@5 {
+			reg = <5>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@6 {
+			reg = <6>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@7 {
+			reg = <7>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@8 {
+			reg = <8>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@9 {
+			reg = <9>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@10 {
+			reg = <10>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@11 {
+			reg = <11>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@12 {
+			reg = <12>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@13 {
+			reg = <13>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@14 {
+			reg = <14>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+
+		gpio@15 {
+			reg = <15>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+	};
+
 	pca_pres2: pca9552@61 {
 		compatible = "nxp,pca9552";
 		reg = <0x61>;
-- 
2.25.1


             reply	other threads:[~2021-09-10 19:55 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-10 19:54 Adriana Kobylak [this message]
2021-09-14  8:49 ` [PATCH v2] ARM: dts: aspeed: rainier: Add N_MODE_VREF gpio Joel Stanley
2021-09-14 20:44   ` Adriana Kobylak
2021-09-15  2:21     ` Joel Stanley
2021-09-15  5:15     ` Milton Miller II
2021-09-15 19:10       ` [EXTERNAL] " Adriana Kobylak

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