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authorEugen Hristev <eugen.hristev@microchip.com>2019-09-09 15:30:34 +0000
committerStephen Boyd <sboyd@kernel.org>2019-09-16 13:15:10 -0700
commit69a6bcde7fd3fe6f3268ce26f31d9d9378384c98 (patch)
tree15f2a98709a4ab34089896598f0930050915af4c /drivers/clk
parent263eaf8f172d9f44e15d6aca85fe40ec18d2c477 (diff)
downloadlinux-69a6bcde7fd3fe6f3268ce26f31d9d9378384c98.tar.bz2
clk: at91: select parent if main oscillator or bypass is enabled
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> Link: https://lkml.kernel.org/r/1568042692-11784-2-git-send-email-eugen.hristev@microchip.com Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/at91/clk-main.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
index ebe9b9998b40..87083b3a2769 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);