[PATCH v2 2/2] sh: add SH7305 CPU subtype support

[Artem Novak <artem122novak@gmail.com>]

Add the SH7305 as an SH4AL-DSP CPU subtype.

Recognize the SH7305 in the SH-4 CPU probe using the existing
0x300b PVR family with PRR value 0xc0, and expose the processor
name through the SH CPU information interface.

Signed-off-by: Artem Novak <artem122novak@gmail.com>
---
 arch/sh/Kconfig                 | 9 +++++++++
 arch/sh/include/asm/processor.h | 2 +-
 arch/sh/kernel/cpu/proc.c       | 3 ++-
 arch/sh/kernel/cpu/sh4/probe.c  | 3 +++
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d60f1d5a94c0..e71b5476769e 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -467,6 +467,15 @@ config CPU_SUBTYPE_SHX3
 
 # SH4AL-DSP Processor Support
 
+config CPU_SUBTYPE_SH7305
+	bool "Support SH7305 processor"
+	select CPU_SH4AL_DSP
+	help
+	  Select this option to build the kernel for systems based on the
+	  Renesas SH7305 processor. The SH7305 belongs to the SH4AL-DSP
+	  processor family and is used in embedded systems such as Casio
+	  graphing calculators.
+
 config CPU_SUBTYPE_SH7343
 	bool "Support SH7343 processor"
 	select CPU_SH4AL_DSP
diff --git a/arch/sh/include/asm/processor.h b/arch/sh/include/asm/processor.h
index 2a0b5713ab80..96321c46ce85 100644
--- a/arch/sh/include/asm/processor.h
+++ b/arch/sh/include/asm/processor.h
@@ -36,7 +36,7 @@ enum cpu_type {
 	CPU_SH7723, CPU_SH7724, CPU_SH7757, CPU_SH7734, CPU_SHX3,
 
 	/* SH4AL-DSP types */
-	CPU_SH7343, CPU_SH7722, CPU_SH7366, CPU_SH7372,
+	CPU_SH7343, CPU_SH7305, CPU_SH7722, CPU_SH7366, CPU_SH7372,
 
 	/* Unknown subtype */
 	CPU_SH_NONE
diff --git a/arch/sh/kernel/cpu/proc.c b/arch/sh/kernel/cpu/proc.c
index 5f6d0e827bae..b6fbe27742e0 100644
--- a/arch/sh/kernel/cpu/proc.c
+++ b/arch/sh/kernel/cpu/proc.c
@@ -25,7 +25,8 @@ static const char *cpu_name[] = {
 	[CPU_SH7786]	= "SH7786",	[CPU_SH7757]	= "SH7757",
 	[CPU_SH7722]	= "SH7722",	[CPU_SHX3]	= "SH-X3",
 	[CPU_MXG]	= "MX-G",	[CPU_SH7723]	= "SH7723",
-	[CPU_SH7366]	= "SH7366",	[CPU_SH7724]	= "SH7724",
+	[CPU_SH7305]	= "SH7305",	[CPU_SH7366]	= "SH7366",
+	[CPU_SH7724]	= "SH7724",
 	[CPU_SH7372]	= "SH7372",	[CPU_SH7734]	= "SH7734",
 	[CPU_J2]	= "J2",
 	[CPU_SH_NONE]	= "Unknown"
diff --git a/arch/sh/kernel/cpu/sh4/probe.c b/arch/sh/kernel/cpu/sh4/probe.c
index ef4dd6295263..7f77fc64258c 100644
--- a/arch/sh/kernel/cpu/sh4/probe.c
+++ b/arch/sh/kernel/cpu/sh4/probe.c
@@ -143,6 +143,9 @@ void cpu_probe(void)
 		break;
 	case 0x300b:
 		switch (prr) {
+		case 0xc0:
+			boot_cpu_data.type = CPU_SH7305;
+			break;
 		case 0x20:
 			boot_cpu_data.type = CPU_SH7724;
 			boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
-- 
2.55.0