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ARM: OMAP: dmtimer: check for fixed timers during config

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The omap_dm_timer_set_source() function provides a means for client
users to configure the mux parent for a GPTimer's functional clock.
However, not all timers are configurable (Eg: Timer12 on DRA7 is fed
by an internal 32k oscillator clock, and does not have configurable
parent clocks). So, check for such cases and proceed with out throwing
an error.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Suman Anna 2015-10-05 18:28:21 -05:00 committed by Tony Lindgren
parent b6a8919418
commit ea05d2eaf6
1 changed files with 7 additions and 0 deletions
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7
arch/arm/plat-omap/dmtimer.c
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@ -36,6 +36,7 @@
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/device.h>
@ -533,6 +534,12 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int 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";