[PATCH] ARM: tegra: fix U16 divider range check

[Stephen Warren]

On 07/24/2012 04:50 PM, Stephen Warren wrote:
> From: Stephen Warren <swarren at nvidia.com>
> 
> A U16 divider can divide a clock by 1..64K. However, the range-check
> in clk_div16_get_divider() limited the range to 1..256. Fix this. NVIDIA's
> downstream kernels already have the fixed range-check.
> 
> In practice this is a problem on Whistler's I2C bus, which uses a bus
> clock rate of 100KHz (rather than the more common 400KHz on Tegra boards),
> which requires a HW module clock of 8*100KHz. The parent clock is 216MHz,
> leading to a desired divider of 270. Prior to conversion to the common
> clock framework, this range error was somehow ignored/irrelevant and
> caused no problems. However, the common clock framework evidently has
> more rigorous error-checking, so this failure causes the I2C bus to fail
> to operate correctly.

Applied to for-3.7/common-clk.