linux-kernel - [PATCH 07/12] arm64: zynqmp: Disable Tri-state for SDIO

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Date: Mon, 27 May 2024 11:34:13 +0200
From: Michal Simek <michal.simek@....com>
To: <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, <git@...inx.com>
CC: Tejas Bhumkar <tejas.arvind.bhumkar@....com>, Conor Dooley
	<conor+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Rob Herring <robh@...nel.org>, "open
 list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@...r.kernel.org>, "moderated list:ARM/ZYNQ ARCHITECTURE"
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 07/12] arm64: zynqmp: Disable Tri-state for SDIO

From: Tejas Bhumkar <tejas.arvind.bhumkar@....com>

Since the zynqmp pinctrl driver now includes support for the
tri-state registers, ensure that the pins needing output-enable
are correctly configured for SOMs.

Currently, there is an issue with the detection of the MMC for
the SOM kv260, resulting in the following error:
ZynqMP> mmc dev 1
Card did not respond to voltage select! : -110

To address this problem, configure the SDIO pins for output-enable
to enable MMC detection.

Signed-off-by: Tejas Bhumkar <tejas.arvind.bhumkar@....com>
Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso | 1 +
 arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
index d7535a77b45e..a09909a6f885 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
@@ -321,6 +321,7 @@ conf {
 			slew-rate = <SLEW_RATE_SLOW>;
 			power-source = <IO_STANDARD_LVCMOS18>;
 			bias-disable;
+			output-enable;
 		};
 
 		conf-cd {
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
index a7b8fffad499..b3b8875f8f7a 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
@@ -305,6 +305,7 @@ conf {
 			slew-rate = <SLEW_RATE_SLOW>;
 			power-source = <IO_STANDARD_LVCMOS18>;
 			bias-disable;
+			output-enable;
 		};
 
 		conf-cd {
-- 
2.40.1