clk: tegra: EMC clock driver depends on EMC driver

The EMC clock driver uses symbols exported by the EMC driver, so it
needs the corresponding dependency to avoid build breakage.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/clk/Kconfig

@@ -158,3 +158,4 @@ source "drivers/clk/bcm/Kconfig"
 source "drivers/clk/mvebu/Kconfig"
 
 source "drivers/clk/samsung/Kconfig"
+source "drivers/clk/tegra/Kconfig"

drivers/clk/tegra/Kconfig

@@ -0,0 +1,3 @@
+config TEGRA_CLK_EMC
+	def_bool y
+	depends on TEGRA124_EMC

drivers/clk/tegra/Makefile

@@ -11,8 +11,9 @@ obj-y					+= clk-tegra-periph.o
 obj-y					+= clk-tegra-pmc.o
 obj-y					+= clk-tegra-fixed.o
 obj-y					+= clk-tegra-super-gen4.o
+obj-$(CONFIG_TEGRA_CLK_EMC)		+= clk-emc.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clk-tegra20.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += clk-tegra30.o
 obj-$(CONFIG_ARCH_TEGRA_114_SOC)	+= clk-tegra114.o
-obj-$(CONFIG_ARCH_TEGRA_124_SOC)	+= clk-tegra124.o clk-emc.o
+obj-$(CONFIG_ARCH_TEGRA_124_SOC)	+= clk-tegra124.o
 obj-$(CONFIG_ARCH_TEGRA_132_SOC)	+= clk-tegra124.o

drivers/clk/tegra/clk.h

@@ -623,8 +623,17 @@ void tegra_super_clk_gen4_init(void __iomem *clk_base,
 			void __iomem *pmc_base, struct tegra_clk *tegra_clks,
 			struct tegra_clk_pll_params *pll_params);
 
+#ifdef CONFIG_TEGRA_CLK_EMC
 struct clk *tegra_clk_register_emc(void __iomem *base, struct device_node *np,
 				   spinlock_t *lock);
+#else
+static inline struct clk *tegra_clk_register_emc(void __iomem *base,
+						 struct device_node *np,
+						 spinlock_t *lock)
+{
+	return NULL;
+}
+#endif
 
 void tegra114_clock_tune_cpu_trimmers_high(void);
 void tegra114_clock_tune_cpu_trimmers_low(void);