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clocksource: timer-ti-dm: Consolidate set source

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Reorder omap_dm_timer_set_source internals to get
source verification more straightforward.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Ladislav Michl 2018-02-23 11:14:22 +01:00 committed by Tony Lindgren
parent 592ea6bd1f
commit ad6e4b6fdc
1 changed files with 16 additions and 22 deletions
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38
drivers/clocksource/timer-ti-dm.c
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@ -166,18 +166,29 @@ static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
{
int ret;
char *parent_name = NULL;
const char *parent_name;
struct clk *parent;
struct dmtimer_platform_data *pdata;
if (unlikely(!timer))
if (unlikely(!timer) || IS_ERR(timer->fclk))
return -EINVAL;
switch (source) {
case OMAP_TIMER_SRC_SYS_CLK:
parent_name = "timer_sys_ck";
break;
case OMAP_TIMER_SRC_32_KHZ:
parent_name = "timer_32k_ck";
break;
case OMAP_TIMER_SRC_EXT_CLK:
parent_name = "timer_ext_ck";
break;
default:
return -EINVAL;
}
pdata = timer->pdev->dev.platform_data;
if (source < 0 || source >= 3)
return -EINVAL;
/*
* FIXME: Used for OMAP1 devices only because they do not currently
* use the clock framework to set the parent clock. To be removed
@ -186,29 +197,12 @@ static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
if (pdata && pdata->set_timer_src)
return pdata->set_timer_src(timer->pdev, source);
if (IS_ERR(timer->fclk))
return -EINVAL;
#if defined(CONFIG_COMMON_CLK)
/* Check if the clock has configurable parents */
if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
return 0;
#endif
switch (source) {
case OMAP_TIMER_SRC_SYS_CLK:
parent_name = "timer_sys_ck";
break;
case OMAP_TIMER_SRC_32_KHZ:
parent_name = "timer_32k_ck";
break;
case OMAP_TIMER_SRC_EXT_CLK:
parent_name = "timer_ext_ck";
break;
}
parent = clk_get(&timer->pdev->dev, parent_name);
if (IS_ERR(parent)) {
pr_err("%s: %s not found\n", __func__, parent_name);