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clk: ti: clkctrl: add new exported API for checking standby info

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Standby status is provided for certain clkctrl clocks to see if the
given module has entered standby or not. This is mostly needed by
remoteproc code to see if the remoteproc has entered standby and the clock
can be turned off safely.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
This commit is contained in:
Tero Kristo 2019-09-12 16:26:06 +03:00
parent 22a6564f71
commit 2209b72d41
2 changed files with 34 additions and 0 deletions
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33
drivers/clk/ti/clkctrl.c
View file

@ -34,6 +34,9 @@
#define OMAP4_IDLEST_MASK (0x3 << 16)
#define OMAP4_IDLEST_SHIFT 16
#define OMAP4_STBYST_MASK BIT(18)
#define OMAP4_STBYST_SHIFT 18
#define CLKCTRL_IDLEST_FUNCTIONAL 0x0
#define CLKCTRL_IDLEST_INTERFACE_IDLE 0x2
#define CLKCTRL_IDLEST_DISABLED 0x3
@ -647,3 +650,33 @@ cleanup:
}
CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl",
_ti_omap4_clkctrl_setup);
/**
* ti_clk_is_in_standby - Check if clkctrl clock is in standby or not
* @clk: clock to check standby status for
*
* Finds whether the provided clock is in standby mode or not. Returns
* true if the provided clock is a clkctrl type clock and it is in standby,
* false otherwise.
*/
bool ti_clk_is_in_standby(struct clk *clk)
{
struct clk_hw *hw;
struct clk_hw_omap *hwclk;
u32 val;
hw = __clk_get_hw(clk);
if (!omap2_clk_is_hw_omap(hw))
return false;
hwclk = to_clk_hw_omap(hw);
val = ti_clk_ll_ops->clk_readl(&hwclk->enable_reg);
if (val & OMAP4_STBYST_MASK)
return true;
return false;
}
EXPORT_SYMBOL_GPL(ti_clk_is_in_standby);

1
include/linux/clk/ti.h
View file

@ -298,6 +298,7 @@ struct ti_clk_features {
void ti_clk_setup_features(struct ti_clk_features *features);
const struct ti_clk_features *ti_clk_get_features(void);
bool ti_clk_is_in_standby(struct clk *clk);
int omap3_noncore_dpll_save_context(struct clk_hw *hw);
void omap3_noncore_dpll_restore_context(struct clk_hw *hw);