u-boot-brain/arch/arm/cpu
Gabe Black 92809eeed2 Exynos: Tidy up the pwm_config function in the exynos pwm driver
Some small fixes in the exynos pwm driver:

1. NS_IN_HZ is non-sensical since these are not compatible units. This
constant actually describes the number of nanoseconds in a second. Renamed it
to NS_IN_SEC. Also dropped the unnecessary parenthesis.
2. The variable "period" is not used to hold a period, it's used to hold a
frequency. Renamed it to "frequency".
3. tcmp is an unsigned value, so (tcmp < 0) will never be true and the if
which checks that condition will never execute. Also, there should be no
problem if the pwm never switches, so there's no reason to subtract one from
tcmp and therefore no reason to compare it against zero. Removed both ifs. If
they weren't removed, tcmp should be a signed value.
4. Add a check for a 0 period.

Test with command "sf probe 1:0; time sf read 40008000 0 1000".
Try with different numbers of bytes and see that sane values are obtained
Build and boot U-boot with this patch, backlight works properly.

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
2013-04-01 14:02:08 +09:00
..
arm720t Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
arm920t Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
arm925t Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
arm926ejs Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
arm946es Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
arm1136 Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
arm1176 ARM: bcm2835: add mailbox driver 2013-03-20 15:29:20 +01:00
arm_intcm Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
armv7 Exynos: Tidy up the pwm_config function in the exynos pwm driver 2013-04-01 14:02:08 +09:00
ixp Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
pxa Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
s3c44b0 Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
sa1100 Replace __bss_end__ with __bss_end 2013-03-15 16:13:54 -04:00
tegra20-common tegra: rename FUNCMUX_UART2_UARTB 2013-02-11 10:35:24 -07:00
tegra30-common Tegra30: Cardhu: Add pad config tables/code based on pinmux code 2013-03-14 11:06:43 -07:00
tegra114-common Tegra114: Dalmore: Add pad config tables/code based on pinmux code 2013-03-14 11:49:14 -07:00
tegra-common Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-02-12 10:18:31 -05:00
u-boot-spl.lds Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00
u-boot.lds Merge branch 'master' of git://git.denx.de/u-boot-arm 2013-03-18 14:37:18 -04:00