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| author |   Vladimir Zapolskiy <vz@mleia.com> | 2015-12-06 13:32:00 +0200 |
|---|---|---|
| committer |   Thierry Reding <thierry.reding@gmail.com> | 2015-12-16 17:00:33 +0100 |
| commit | 82aff048dde444334c7045fab620b13058ff15a7 (patch) | |
| tree | 8fc041203864b1796c434dcf203b8e42868efe94 /drivers/pwm | |
| parent | pwm: lpc32xx: correct number of PWM channels from 2 to 1 (diff) | |
| download | linux-dev-82aff048dde444334c7045fab620b13058ff15a7.tar.xz linux-dev-82aff048dde444334c7045fab620b13058ff15a7.zip | |
pwm: lpc32xx: make device usable with common clock framework
As a preparatory change for switching LPC32xx mach support to common
clock framework fix clk_enable/clk_disable calls without matching
clk_prepare/clk_unprepare.
The driver can not be used on a platform with common clock framework
until clk_prepare/clk_unprepare calls are added, otherwise clk_enable
calls will fail and a WARN is generated:
# echo 1 > /sys/bus/platform/drivers/lpc32xx-pwm/4005c000.pwm/pwm/pwmchip0/pwm0/enable
------------[ cut here ]------------
WARNING: CPU: 0 PID: 701 at drivers/clk/clk.c:727 clk_core_enable+0x2c/0xa4()
Modules linked in: sc16is7xx
CPU: 0 PID: 701 Comm: sh Tainted: G W 4.3.0-rc2+ #171
Hardware name: LPC32XX SoC (Flattened Device Tree)
Backtrace:
[<>] (dump_backtrace) from [<>] (show_stack+0x18/0x1c)
[<>] (show_stack) from [<>] (dump_stack+0x20/0x28)
[<>] (dump_stack) from [<>] (warn_slowpath_common+0x90/0xb8)
[<>] (warn_slowpath_common) from [<>] (warn_slowpath_null+0x24/0x2c)
[<>] (warn_slowpath_null) from [<>] (clk_core_enable+0x2c/0xa4)
[<>] (clk_core_enable) from [<>] (clk_enable+0x24/0x38)
[<>] (clk_enable) from [<>] (lpc32xx_pwm_enable+0x1c/0x40)
[<>] (lpc32xx_pwm_enable) from [<>] (pwm_enable+0x48/0x5c)
[<>] (pwm_enable) from [<>] (pwm_enable_store+0x5c/0x78)
[<>] (pwm_enable_store) from [<>] (dev_attr_store+0x20/0x2c)
[<>] (dev_attr_store) from [<>] (sysfs_kf_write+0x44/0x50)
[<>] (sysfs_kf_write) from [<>] (kernfs_fop_write+0x134/0x194)
[<>] (kernfs_fop_write) from [<>] (__vfs_write+0x34/0xdc)
[<>] (__vfs_write) from [<>] (vfs_write+0xb8/0x140)
[<>] (vfs_write) from [<>] (SyS_write+0x50/0x90)
[<>] (SyS_write) from [<>] (ret_fast_syscall+0x0/0x38)
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-lpc32xx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c index ce8ab202be8b..63468a872ca7 100644 --- a/drivers/pwm/pwm-lpc32xx.c +++ b/drivers/pwm/pwm-lpc32xx.c @@ -83,7 +83,7 @@ static int lpc32xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) u32 val; int ret; - ret = clk_enable(lpc32xx->clk); + ret = clk_prepare_enable(lpc32xx->clk); if (ret) return ret; @@ -103,7 +103,7 @@ static void lpc32xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) val &= ~PWM_ENABLE; writel(val, lpc32xx->base + (pwm->hwpwm << 2)); - clk_disable(lpc32xx->clk); + clk_disable_unprepare(lpc32xx->clk); } static const struct pwm_ops lpc32xx_pwm_ops = { |