On 09/09/2019 15:30:34+0000, eugen.hris...@microchip.com wrote: > From: Eugen Hristev <eugen.hris...@microchip.com> > > Selecting the right parent for the main clock is done using only > main oscillator enabled bit. > In case we have this oscillator bypassed by an external signal (no driving > on the XOUT line), we still use external clock, but with BYPASS bit set. > So, in this case we must select the same parent as before. > Create a macro that will select the right parent considering both bits from > the MOR register. > Use this macro when looking for the right parent. > > Signed-off-by: Eugen Hristev <eugen.hris...@microchip.com> Acked-by: Alexandre Belloni <alexandre.bell...@bootlin.com>
> --- > drivers/clk/at91/clk-main.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c > index ebe9b99..87083b3 100644 > --- a/drivers/clk/at91/clk-main.c > +++ b/drivers/clk/at91/clk-main.c > @@ -21,6 +21,10 @@ > > #define MOR_KEY_MASK (0xff << 16) > > +#define clk_main_parent_select(s) (((s) & \ > + (AT91_PMC_MOSCEN | \ > + AT91_PMC_OSCBYPASS)) ? 1 : 0) > + > struct clk_main_osc { > struct clk_hw hw; > struct regmap *regmap; > @@ -113,7 +117,7 @@ static int clk_main_osc_is_prepared(struct clk_hw *hw) > > regmap_read(regmap, AT91_PMC_SR, &status); > > - return (status & AT91_PMC_MOSCS) && (tmp & AT91_PMC_MOSCEN); > + return (status & AT91_PMC_MOSCS) && clk_main_parent_select(tmp); > } > > static const struct clk_ops main_osc_ops = { > @@ -450,7 +454,7 @@ static u8 clk_sam9x5_main_get_parent(struct clk_hw *hw) > > regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status); > > - return status & AT91_PMC_MOSCEN ? 1 : 0; > + return clk_main_parent_select(status); > } > > static const struct clk_ops sam9x5_main_ops = { > @@ -492,7 +496,7 @@ at91_clk_register_sam9x5_main(struct regmap *regmap, > clkmain->hw.init = &init; > clkmain->regmap = regmap; > regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status); > - clkmain->parent = status & AT91_PMC_MOSCEN ? 1 : 0; > + clkmain->parent = clk_main_parent_select(status); > > hw = &clkmain->hw; > ret = clk_hw_register(NULL, &clkmain->hw); > -- > 2.7.4 > -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com