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SubjectRe: [PATCH 2/2] clk: at91: select parent if main oscillator or bypass is enabled
On 09/09/2019 15:30:34+0000, Eugen.Hristev@microchip.com wrote:
> From: Eugen Hristev <eugen.hristev@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.hristev@microchip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@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

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