From: Steven Lee <steven_lee@aspeedtech.com>
To: Andrew Jeffery <andrew@aj.id.au>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>, Joel Stanley <joel@jms.id.au>,
"Adrian Hunter" <adrian.hunter@intel.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Ryan Chen <ryanchen.aspeed@gmail.com>,
"moderated list:ASPEED SD/MMC DRIVER"
<linux-aspeed@lists.ozlabs.org>,
"moderated list:ASPEED SD/MMC DRIVER" <openbmc@lists.ozlabs.org>,
"open list:ASPEED SD/MMC DRIVER" <linux-mmc@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"moderated list:ARM/ASPEED MACHINE SUPPORT"
<linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>
Cc: <steven_lee@aspeedtech.com>, <Hongweiz@ami.com>,
<ryan_chen@aspeedtech.com>, <chin-ting_kuo@aspeedtech.com>
Subject: [PATCH v3 2/5] ARM: dts: aspeed: ast2600evb: Add comment for gpio regulator of sdhci
Date: Thu, 6 May 2021 18:03:09 +0800 [thread overview]
Message-ID: <20210506100312.1638-3-steven_lee@aspeedtech.com> (raw)
In-Reply-To: <20210506100312.1638-1-steven_lee@aspeedtech.com>
Add the description for describing the AST2600-A2 EVB reference design of
GPIO regulators.
Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
---
arch/arm/boot/dts/aspeed-ast2600-evb.dts | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/arm/boot/dts/aspeed-ast2600-evb.dts b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
index 2772796e215e..1ae0facc3d5f 100644
--- a/arch/arm/boot/dts/aspeed-ast2600-evb.dts
+++ b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
@@ -104,6 +104,21 @@
status = "okay";
};
+/*
+ * The signal voltage of sdhci0 and sdhci1 on AST2600-A2 EVB is able to be
+ * toggled by GPIO pins.
+ * In the reference design, GPIOV0 of AST2600-A2 EVB is connected to the
+ * power load switch that providing 3.3v to sdhci0 vdd, GPIOV1 is connected to
+ * a 1.8v and a 3.3v power load switch that providing signal voltage to
+ * sdhci0 bus.
+ * If GPIOV0 is active high, sdhci0 is enabled, otherwise, sdhci0 is disabled.
+ * If GPIOV1 is active high, 3.3v power load switch is enabled, sdhci0 signal
+ * voltage is 3.3v, otherwise, 1.8v power load switch will be enabled,
+ * sdhci0 signal voltage becomes 1.8v.
+ * AST2600-A2 EVB also support toggling signal voltage for sdhci1.
+ * The design is the same as sdhci0, it uses GPIOV2 as power-gpio and GPIOV3
+ * as power-switch-gpio.
+ */
&emmc {
non-removable;
bus-width = <4>;
--
2.17.1
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next prev parent reply other threads:[~2021-05-06 10:08 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 10:03 [PATCH v3 0/5] mmc: sdhci-of-aspeed: Support toggling SD bus signal Steven Lee
2021-05-06 10:03 ` [PATCH v3 1/5] dt-bindings: mmc: sdhci-of-aspeed: Add an example for AST2600-A2 EVB Steven Lee
2021-05-07 1:13 ` Rob Herring
2021-05-07 3:13 ` Steven Lee
2021-05-07 17:21 ` Rob Herring
2021-05-10 2:32 ` Steven Lee
2021-05-06 10:03 ` Steven Lee [this message]
2021-05-07 1:40 ` [PATCH v3 2/5] ARM: dts: aspeed: ast2600evb: Add comment for gpio regulator of sdhci Andrew Jeffery
2021-05-07 3:30 ` Steven Lee
2021-05-07 3:42 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 3/5] ARM: dts: aspeed: ast2600evb: Add phase correction for emmc controller Steven Lee
2021-05-07 1:34 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 4/5] mmc: sdhci-of-aspeed: Add a helper for updating capability register Steven Lee
2021-05-07 2:13 ` Andrew Jeffery
2021-05-07 6:59 ` Steven Lee
2021-05-07 7:07 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 5/5] mmc: sdhci-of-aspeed: Assert/Deassert reset signal before probing eMMC Steven Lee
2021-05-06 10:24 ` Philipp Zabel
2021-05-07 1:32 ` Andrew Jeffery
2021-05-07 6:24 ` Steven Lee
2021-05-07 7:36 ` Andrew Jeffery
2021-05-10 6:03 ` Steven Lee
2021-05-13 0:42 ` Andrew Jeffery
2021-05-14 2:09 ` Steven Lee
2021-05-14 2:37 ` Andrew Jeffery
2021-05-19 10:57 ` Steven Lee
2021-05-19 23:09 ` Andrew Jeffery
2021-05-07 6:02 ` Steven Lee
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