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ARM: imx: add necessary interface for pfd 

Common clk framework will disable unused clks in late init only if
they are enabled by default and no one is using it, so we need to
add is_enabled callback for clk framework to get clks' status.

PFD clocks are enabled by hardware reset, so we need to add
interface for common clk framework to disable those unused ones for
saving power.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Anson Huang 2013-12-24 14:05:38 -05:00 committed by Shawn Guo
parent 5a72f10500
commit adf15fa596
1 changed files with 11 additions and 0 deletions
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11
arch/arm/mach-imx/clk-pfd.c
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@ -109,12 +109,23 @@ static int clk_pfd_set_rate(struct clk_hw *hw, unsigned long rate,
return 0;
}
static int clk_pfd_is_enabled(struct clk_hw *hw)
{
struct clk_pfd *pfd = to_clk_pfd(hw);
if (readl_relaxed(pfd->reg) & (1 << ((pfd->idx + 1) * 8 - 1)))
return 0;
return 1;
}
static const struct clk_ops clk_pfd_ops = {
.enable = clk_pfd_enable,
.disable = clk_pfd_disable,
.recalc_rate = clk_pfd_recalc_rate,
.round_rate = clk_pfd_round_rate,
.set_rate = clk_pfd_set_rate,
.is_enabled = clk_pfd_is_enabled,
};
struct clk *imx_clk_pfd(const char *name, const char *parent_name,