linux-kernel - [PATCH 1/3] firmware: imx: Add stub functions for SCMI MISC API

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Message-Id: <20250807-imx9-sm-v1-1-3489e41a6fda@nxp.com>
Date: Thu, 07 Aug 2025 09:47:42 +0800
From: Peng Fan <peng.fan@....com>
To: Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Arnd Bergmann <arnd@...db.de>, 
 Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH 1/3] firmware: imx: Add stub functions for SCMI MISC API

To ensure successful builds when CONFIG_IMX_SCMI_MISC_DRV is not enabled,
this patch adds static inline stub implementations for the following
functions:

  - scmi_imx_misc_ctrl_get()
  - scmi_imx_misc_ctrl_set()

These stubs return -EOPNOTSUPP to indicate that the functionality is not
supported in the current configuration. This avoids potential build or
link errors in code that conditionally calls these functions based on
feature availability.

Fixes: 540c830212ed ("firmware: imx: remove duplicate scmi_imx_misc_ctrl_get()")
Fixes: 0b4f8a68b292 ("firmware: imx: Add i.MX95 MISC driver")
Signed-off-by: Peng Fan <peng.fan@....com>
---
 include/linux/firmware/imx/sm.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/firmware/imx/sm.h b/include/linux/firmware/imx/sm.h
index d4212bc42b2c17fb8f94d58856a75beb5611ce4b..99c15bbb46aa8329b5aa8e03017e152074cdf492 100644
--- a/include/linux/firmware/imx/sm.h
+++ b/include/linux/firmware/imx/sm.h
@@ -26,8 +26,20 @@
 #define SCMI_IMX94_CTRL_SAI3_MCLK	5U	/*!< WAKE SAI3 MCLK */
 #define SCMI_IMX94_CTRL_SAI4_MCLK	6U	/*!< WAKE SAI4 MCLK */
 
+#if IS_ENABLED(CONFIG_IMX_SCMI_MISC_DRV)
 int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val);
 int scmi_imx_misc_ctrl_set(u32 id, u32 val);
+#else
+static inline int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int scmi_imx_misc_ctrl_set(u32 id, u32 val)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 
 int scmi_imx_cpu_start(u32 cpuid, bool start);
 int scmi_imx_cpu_started(u32 cpuid, bool *started);

-- 
2.37.1