linux-kernel - [PATCH v4 3/8] ARM: trusted_foundations: Provide information about whether firmware is registered

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Date:   Mon, 18 Feb 2019 03:17:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Russell King <linux@...linux.org.uk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Robert Yang <decatf@...il.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/8] ARM: trusted_foundations: Provide information about whether firmware is registered

Add a helper that provides information about whether Trusted Foundations
firmware operations have been registered.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/firmware/trusted_foundations.c    | 5 +++++
 arch/arm/include/asm/trusted_foundations.h | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c
index c496f4cc49cb..d795ed83a3cd 100644
--- a/arch/arm/firmware/trusted_foundations.c
+++ b/arch/arm/firmware/trusted_foundations.c
@@ -172,3 +172,8 @@ void of_register_trusted_foundations(void)
 		panic("Trusted Foundation: missing version-minor property\n");
 	register_trusted_foundations(&pdata);
 }
+
+bool trusted_foundations_registered(void)
+{
+	return firmware_ops == &trusted_foundations_ops;
+}
diff --git a/arch/arm/include/asm/trusted_foundations.h b/arch/arm/include/asm/trusted_foundations.h
index cdd48ab7d191..3f23fa493db6 100644
--- a/arch/arm/include/asm/trusted_foundations.h
+++ b/arch/arm/include/asm/trusted_foundations.h
@@ -31,6 +31,7 @@
 #include <linux/of.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
+#include <linux/types.h>
 
 #define TF_PM_MODE_LP0			0
 #define TF_PM_MODE_LP1			1
@@ -47,6 +48,7 @@ struct trusted_foundations_platform_data {
 
 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
 void of_register_trusted_foundations(void);
+bool trusted_foundations_registered(void);
 
 #else /* CONFIG_TRUSTED_FOUNDATIONS */
 
@@ -74,6 +76,11 @@ static inline void of_register_trusted_foundations(void)
 	if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
 		register_trusted_foundations(NULL);
 }
+
+static inline bool trusted_foundations_registered(void)
+{
+	return false;
+}
 #endif /* CONFIG_TRUSTED_FOUNDATIONS */
 
 #endif
-- 
2.20.1