ARM: tegra11: clock: Support cbus scaling below Fmax@Vmin

So far, frequencies of graphics engines on cbus are scaled along
the respective DVFS operating points only, which effectively set
minimum scaling frequency to Fmax@Vmin level.

This commit extended cbus scaling range down to the minimum rate
supported by the bus parent pll with the regular frequency steps
of 48MHz.

Change-Id: I8289f0317d85529c5d765d8f800319eb19de6423
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/168189
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/clock.h b/arch/arm/mach-tegra/clock.h
index c0c8a3d7fb38..cbc3e23bd1ab 100644
--- a/arch/arm/mach-tegra/clock.h
+++ b/arch/arm/mach-tegra/clock.h
@@ -221,6 +221,7 @@ struct clk {
 		struct {
 			struct clk			*top_user;
 			struct clk			*slow_user;
+			unsigned long			fmax_at_vmin;
 		} cbus;
 		struct {
 			struct list_head		node;