linux-kernel - [PATCH] arm: mach-k3: am642_init: Unlock MCU PADCFG regs

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Date:   Wed, 15 Dec 2021 16:10:23 +0100
From:   Christian Gmeiner <christian.gmeiner@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Michael Liebert <liebert@...-augsburg.de>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        Dave Gerlach <d-gerlach@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Aswath Govindraju <a-govindraju@...com>,
        Keerthy <j-keerthy@...com>, u-boot@...ts.denx.de
Subject: [PATCH] arm: mach-k3: am642_init: Unlock MCU PADCFG regs

From: Michael Liebert <liebert@...-augsburg.de>

Currently only the PADCFG registers of the main domain are unlocked.
Also unlock PADCFG registers of MCU domain, so MCU pin muxing can be configured by u-boot or Linux.

Signed-off-by: Michael Liebert <liebert@...-augsburg.de>
Tested-by: Christian Gmeiner <christian.gmeiner@...il.com>
---
 arch/arm/mach-k3/am642_init.c                 | 3 +++
 arch/arm/mach-k3/include/mach/am64_hardware.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm/mach-k3/am642_init.c b/arch/arm/mach-k3/am642_init.c
index 533905daeb..958fa05af4 100644
--- a/arch/arm/mach-k3/am642_init.c
+++ b/arch/arm/mach-k3/am642_init.c
@@ -37,6 +37,9 @@ static void ctrl_mmr_unlock(void)
 	mmr_unlock(CTRL_MMR0_BASE, 3);
 	mmr_unlock(CTRL_MMR0_BASE, 5);
 	mmr_unlock(CTRL_MMR0_BASE, 6);
+
+	/* Unlock all MCU_PADCFG_MMR1 module registers */
+	mmr_unlock(MCU_PADCFG_MMR1_BASE, 1);
 }
 
 /*
diff --git a/arch/arm/mach-k3/include/mach/am64_hardware.h b/arch/arm/mach-k3/include/mach/am64_hardware.h
index 96383437d5..e06e1f9532 100644
--- a/arch/arm/mach-k3/include/mach/am64_hardware.h
+++ b/arch/arm/mach-k3/include/mach/am64_hardware.h
@@ -12,6 +12,8 @@
 
 #define PADCFG_MMR1_BASE				0xf0000
 
+#define MCU_PADCFG_MMR1_BASE				0x04080000
+
 #define MAIN_DEVSTAT_PRIMARY_BOOTMODE_MASK		0x00000078
 #define MAIN_DEVSTAT_PRIMARY_BOOTMODE_SHIFT		3
 
-- 
2.33.1