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From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Fri, 14 Jun 2024 16:40:15 +0100
Subject: [PATCH 07/10] platform: mips: cpu_hwmon: Disable driver on
 unsupported hardware
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Message-Id: <20240614-ls3k-mips-v1-7-7614340ace7d@flygoat.com>
References: <20240614-ls3k-mips-v1-0-7614340ace7d@flygoat.com>
In-Reply-To: <20240614-ls3k-mips-v1-0-7614340ace7d@flygoat.com>
To: Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>, 
 Conor Dooley <conor+dt@kernel.org>, 
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>, 
 Qing Zhang <zhangqing@loongson.cn>, Binbin Zhou <zhoubinbin@loongson.cn>, 
 Huacai Chen <chenhuacai@kernel.org>
Cc: devicetree@vger.kernel.org, linux-mips@vger.kernel.org, 
 linux-kernel@vger.kernel.org, Jiaxun Yang <jiaxun.yang@flygoat.com>, 
 stable@vger.kernel.org

cpu_hwmon is unsupported on CPUs without loongson_chiptemp
register and csr.

Cc: stable@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 drivers/platform/mips/cpu_hwmon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c
index d8c5f9195f85..2ac2f31090f9 100644
--- a/drivers/platform/mips/cpu_hwmon.c
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -139,6 +139,9 @@ static int __init loongson_hwmon_init(void)
 		csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
 				  LOONGSON_CSRF_TEMP;
 
+	if (!csr_temp_enable && !loongson_chiptemp[0])
+		return -ENODEV;
+
 	nr_packages = loongson_sysconf.nr_cpus /
 		loongson_sysconf.cores_per_package;
 

-- 
2.43.0