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misc: atmel_tclib: get and use slow clock

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Commit dca1a4b5ff ("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.

Get and use the slow clock as it is necessary for the timer counters.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Boris Brezillon
2015-08-16 11:23:46 +02:00
committed by Alexandre Belloni
parent eed9fb9df4
commit 7d8d05d114
4 changed files with 34 additions and 9 deletions
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26
drivers/pwm/pwm-atmel-tcb.c
View File

@@ -305,7 +305,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
*/
if (i == 5) {
i = slowclk;
rate = 32768;
rate = clk_get_rate(tc->slow_clk);
min = div_u64(NSEC_PER_SEC, rate);
max = min << tc->tcb_config->counter_width;
@@ -387,9 +387,9 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
if (tcbpwm == NULL) {
atmel_tc_free(tc);
err = -ENOMEM;
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
goto err_free_tc;
}
tcbpwm->chip.dev = &pdev->dev;
@@ -400,17 +400,27 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
tcbpwm->chip.npwm = NPWM;
tcbpwm->tc = tc;
err = clk_prepare_enable(tc->slow_clk);
if (err)
goto err_free_tc;
spin_lock_init(&tcbpwm->lock);
err = pwmchip_add(&tcbpwm->chip);
if (err < 0) {
atmel_tc_free(tc);
return err;
}
if (err < 0)
goto err_disable_clk;
platform_set_drvdata(pdev, tcbpwm);
return 0;
err_disable_clk:
clk_disable_unprepare(tcbpwm->tc->slow_clk);
err_free_tc:
atmel_tc_free(tc);
return err;
}
static int atmel_tcb_pwm_remove(struct platform_device *pdev)
@@ -418,6 +428,8 @@ static int atmel_tcb_pwm_remove(struct platform_device *pdev)
struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
int err;
clk_disable_unprepare(tcbpwm->tc->slow_clk);
err = pwmchip_remove(&tcbpwm->chip);
if (err < 0)
return err;