linux-kernel - [PATCH V2] ARM: dts: am335x-pocketbeagle: Fix mmc0 Write Protect

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Message-ID: <20200609214521.GB2995279@x1>
Date:   Tue, 9 Jun 2020 23:45:21 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     Tony Lindgren <tony@...mide.com>, Rob Herring <robh+dt@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>
Subject: [PATCH V2] ARM: dts: am335x-pocketbeagle: Fix mmc0 Write Protect

AM3358 pin mcasp0_aclkr (ZCZ ball B13) [0] is routed to P1.31 header [1]
Mode 4 of this pin is mmc0_sdwp (SD Write Protect).  A signal connected
to P1.31 may accidentally trigger mmc0 write protection.  To avoid this
situation, do not put mcasp0_aclkr in mode 4 (mmc0_sdwp) by default.

[0] http://www.ti.com/lit/ds/symlink/am3358.pdf
[1] https://github.com/beagleboard/pocketbeagle/wiki/System-Reference-Manual#531_Expansion_Headers

Fixes: 047905376a16 (ARM: dts: Add am335x-pocketbeagle)
Signed-off-by: Robert Nelson <robertcnelson@...il.com>
Signed-off-by: Drew Fustini <drew@...gleboard.org>
---
V2 change:
- correct P1.13 to P1.31, apologies for not catching that in V1

 arch/arm/boot/dts/am335x-pocketbeagle.dts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/am335x-pocketbeagle.dts b/arch/arm/boot/dts/am335x-pocketbeagle.dts
index 4da719098028..f0b222201b86 100644
--- a/arch/arm/boot/dts/am335x-pocketbeagle.dts
+++ b/arch/arm/boot/dts/am335x-pocketbeagle.dts
@@ -88,7 +88,6 @@ AM33XX_PADCONF(AM335X_PIN_MMC0_DAT2, PIN_INPUT_PULLUP, MUX_MODE0)
                        AM33XX_PADCONF(AM335X_PIN_MMC0_DAT3, PIN_INPUT_PULLUP, MUX_MODE0)
                        AM33XX_PADCONF(AM335X_PIN_MMC0_CMD, PIN_INPUT_PULLUP, MUX_MODE0)
                        AM33XX_PADCONF(AM335X_PIN_MMC0_CLK, PIN_INPUT_PULLUP, MUX_MODE0)
-                       AM33XX_PADCONF(AM335X_PIN_MCASP0_ACLKR, PIN_INPUT, MUX_MODE4)           /* (B12) mcasp0_aclkr.mmc0_sdwp */
                >;
        };

--
2.25.1