pwm: atmel-tcb: fix max time computation for slow clk source

Use the the tcb counter width to compute the maximum time that can be
represented using the slow clock source instead of the static 16 bit width.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 026696970d7797924fdba501b9c06283c27bc7c4..f3dcd02390f1b5da7d9cf43d3b053d3e6840bc0f 100644 (file)
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -307,7 +307,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
                i = slowclk;
                rate = 32768;
                min = div_u64(NSEC_PER_SEC, rate);
-               max = min << 16;
+               max = min << tc->tcb_config->counter_width;
 
                /* If period is too big return ERANGE error */
                if (max < period_ns)