clock: implement a driver for the Tegra CAR

Implement a clock uclass driver for the Tegra CAR. This allows clients to
use standard clock APIs on Tegra. This device is intended to be
instantiated by the core Tegra CAR driver, rather than being instantiated
directly from DT. The implementation uses the existing custom Tegra-
specific clock APIs to avoid coupling the series with significant
refactoring of the existing Tegra clock/clock code. The driver currently
only supports peripheral clocks, and avoids support for other clocks such
as PLLs and external clocks. This should be sufficient to convert over all
Tegra peripheral drivers, and avoids a complex implementation which calls
different Tegra-specific clock APIs based on the type of clock being
manipulated.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/clk/tegra/Kconfig b/drivers/clk/tegra/Kconfig
index 659fe02..ce80b1f 100644
--- a/drivers/clk/tegra/Kconfig
+++ b/drivers/clk/tegra/Kconfig
@@ -1,3 +1,10 @@
+config TEGRA_CAR_CLOCK
+	bool "Enable Tegra CAR-based clock driver"
+	depends on TEGRA_CAR
+	help
+	  Enable support for manipulating Tegra's on-SoC clocks via direct
+	  register access to the Tegra CAR (Clock And Reset controller).
+
 config TEGRA186_CLOCK
 	bool "Enable Tegra186 BPMP-based clock driver"
 	depends on TEGRA186_BPMP