[RFC PATCH 2/2] sh: fx9750giii: add board support

[Artem Novak]

Add minimal machine support for the Casio fx-9750GIII graphing calculator.

Introducing a board Kconfig option and registration on its machine vector.
Wire the board directory into the SuperH build system.

Signed-off-by: Artem Novak <artem122novak@xxxxxxxxx>
---
 arch/sh/Makefile                        |  1 +
 arch/sh/boards/Kconfig                  | 12 ++++++++++++
 arch/sh/boards/Makefile                 |  1 +
 arch/sh/boards/mach-fx9750giii/Makefile |  2 ++
 arch/sh/boards/mach-fx9750giii/setup.c  | 14 ++++++++++++++
 5 files changed, 30 insertions(+)
 create mode 100644 arch/sh/boards/mach-fx9750giii/Makefile
 create mode 100644 arch/sh/boards/mach-fx9750giii/setup.c

diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 380e3b7dc597..28b431a8c8d9 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -128,6 +128,7 @@ machdir-$(CONFIG_SH_KFR2R09)			+= mach-kfr2r09
 machdir-$(CONFIG_SH_ECOVEC)			+= mach-ecovec24
 machdir-$(CONFIG_SH_SDK7786)			+= mach-sdk7786
 machdir-$(CONFIG_SH_X3PROTO)			+= mach-x3proto
+machdir-$(CONFIG_SH_FX9750GIII)		+= mach-fx9750giii
 machdir-$(CONFIG_SH_LANDISK)			+= mach-landisk
 machdir-y					+= mach-common
 
diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig
index d89b74177233..f1571b0e5f1f 100644
--- a/arch/sh/boards/Kconfig
+++ b/arch/sh/boards/Kconfig
@@ -326,6 +326,18 @@ config SH_LBOX_RE2
 	help
 	  Select L-BOX RE2 if configuring for the NTT COMWARE L-BOX RE2.
 
+
+config SH_FX9750GIII
+	bool "Casio fx-9750GIII"
+	depends on CPU_SUBTYPE_SH7305
+	select OF
+	select OF_EARLY_FLATTREE
+	help
+	  Enable board support for the Casio fx-9750GIII
+	  graphing calculator, based on the Renesas SH7305.
+	  This selects the calculator machine vector and
+	  enables early Device Tree support for the board.
+
 config SH_X3PROTO
 	bool "SH-X3 Prototype board"
 	depends on CPU_SUBTYPE_SHX3
diff --git a/arch/sh/boards/Makefile b/arch/sh/boards/Makefile
index fbbc350ca854..c60d038872e9 100644
--- a/arch/sh/boards/Makefile
+++ b/arch/sh/boards/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_SH_ECOVEC)		+= mach-ecovec24/
 obj-$(CONFIG_SH_SDK7780)	+= mach-sdk7780/
 obj-$(CONFIG_SH_SDK7786)	+= mach-sdk7786/
 obj-$(CONFIG_SH_X3PROTO)	+= mach-x3proto/
+obj-$(CONFIG_SH_FX9750GIII)	+= mach-fx9750giii/
 obj-$(CONFIG_SH_SH7763RDP)	+= mach-sh7763rdp/
 obj-$(CONFIG_SH_LANDISK)	+= mach-landisk/
 obj-$(CONFIG_SH_LBOX_RE2)	+= mach-lboxre2/
diff --git a/arch/sh/boards/mach-fx9750giii/Makefile b/arch/sh/boards/mach-fx9750giii/Makefile
new file mode 100644
index 000000000000..0d6df7044567
--- /dev/null
+++ b/arch/sh/boards/mach-fx9750giii/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-y += setup.o
diff --git a/arch/sh/boards/mach-fx9750giii/setup.c b/arch/sh/boards/mach-fx9750giii/setup.c
new file mode 100644
index 000000000000..233decdd1bfe
--- /dev/null
+++ b/arch/sh/boards/mach-fx9750giii/setup.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (C) 2026 Artem Novak
+/*
+ * Casio fx-9750GIII platform support
+ *
+ */
+
+#include <linux/init.h>
+
+#include <asm/machvec.h>
+
+static struct sh_machine_vector mv_fx9750giii __initmv = {
+	.mv_name	= "Casio fx-9750GIII",
+};
-- 
2.56.0