linux-kernel - [PATCH] arm64: Set ARCH_NR_GPIO to 2048 for ARCH

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Date:   Mon,  2 May 2022 18:14:27 +0900
From:   Hector Martin <marcan@...can.st>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>
Subject: [PATCH] arm64: Set ARCH_NR_GPIO to 2048 for ARCH_APPLE

We're already running into the 512 GPIO limit on t600[01] depending on
how many SMC GPIOs we allocate, and a 2-die version could double that.
Let's make it 2K to be safe for now.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 arch/arm64/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 20ea89d9ac2f..b0da0a28aa2d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2050,6 +2050,18 @@ config STACKPROTECTOR_PER_TASK
 	def_bool y
 	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG
 
+# The GPIO number here must be sorted by descending number. In case of
+# a multiplatform kernel, we just want the highest value required by the
+# selected platforms.
+config ARCH_NR_GPIO
+        int
+        default 2048 if ARCH_APPLE
+        default 0
+        help
+          Maximum number of GPIOs in the system.
+
+          If unsure, leave the default value.
+
 endmenu
 
 menu "Boot options"
-- 
2.35.1