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drivers: clock_control: Smartbond: Add runtime frequency support

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RC32K and RCX low power clocks require runtime calibration to work
correctly.
Frequency of those clock can differ from chip to chip, one constant
value from Kconfig may not be best when low power clock (sourced
from RCX or RC32K) is used for system tick.

This code modifies global z_clock_hw_cycles_per_sec variable that
is used when TIMER_READS_ITS_FREQUENCY_AT_RUNTIME is enabled
in Kconfig.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>
This commit is contained in:
Jerzy Kasenberg 2024-01-17 10:13:43 +01:00 • committed by Carles Cufí
commit 82ca880fb9
2 changed files with 31 additions and 0 deletions
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30
drivers/clock_control/clock_control_smartbond.c
View file

@ -34,8 +34,13 @@ struct lpc_clock_state {
DT_PROP(DT_NODELABEL(rcx), calibration_interval) : \ DT_PROP(DT_NODELABEL(rcx), calibration_interval) : \
DT_PROP(DT_NODELABEL(rc32k), calibration_interval)) DT_PROP(DT_NODELABEL(rc32k), calibration_interval))
#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
extern int z_clock_hw_cycles_per_sec;
#endif
static void calibration_work_cb(struct k_work *work); static void calibration_work_cb(struct k_work *work);
static void xtal32k_settle_work_cb(struct k_work *work); static void xtal32k_settle_work_cb(struct k_work *work);
static enum smartbond_clock smartbond_source_clock(enum smartbond_clock clk);
static K_WORK_DELAYABLE_DEFINE(calibration_work, calibration_work_cb); static K_WORK_DELAYABLE_DEFINE(calibration_work, calibration_work_cb);
static K_WORK_DELAYABLE_DEFINE(xtal32k_settle_work, xtal32k_settle_work_cb); static K_WORK_DELAYABLE_DEFINE(xtal32k_settle_work, xtal32k_settle_work_cb);
@ -59,6 +64,18 @@ static void calibration_work_cb(struct k_work *work)
LOG_DBG("RC32K calibration done, RC32K freq: %d", LOG_DBG("RC32K calibration done, RC32K freq: %d",
(int)lpc_clock_state.rc32k_freq); (int)lpc_clock_state.rc32k_freq);
} }
#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
switch (smartbond_source_clock(SMARTBOND_CLK_LP_CLK)) {
case SMARTBOND_CLK_RCX:
z_clock_hw_cycles_per_sec = lpc_clock_state.rcx_freq;
break;
case SMARTBOND_CLK_RC32K:
z_clock_hw_cycles_per_sec = lpc_clock_state.rc32k_freq;
break;
default:
break;
}
#endif
} }
static void xtal32k_settle_work_cb(struct k_work *work) static void xtal32k_settle_work_cb(struct k_work *work)
@ -350,6 +367,19 @@ int z_smartbond_select_lp_clk(enum smartbond_clock lp_clk)
} }
if (rc == 0) { if (rc == 0) {
#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
switch (lp_clk) {
case SMARTBOND_CLK_RCX:
z_clock_hw_cycles_per_sec = lpc_clock_state.rcx_freq;
break;
case SMARTBOND_CLK_RC32K:
z_clock_hw_cycles_per_sec = lpc_clock_state.rc32k_freq;
break;
default:
z_clock_hw_cycles_per_sec = 32768;
break;
}
#endif
CRG_TOP->CLK_CTRL_REG = (CRG_TOP->CLK_CTRL_REG & ~clk_sel_msk) | clk_sel; CRG_TOP->CLK_CTRL_REG = (CRG_TOP->CLK_CTRL_REG & ~clk_sel_msk) | clk_sel;
} }

1
soc/renesas/smartbond/da1469x/Kconfig
View file

@ -14,3 +14,4 @@ config SOC_SERIES_DA1469X
select CLOCK_CONTROL_SMARTBOND select CLOCK_CONTROL_SMARTBOND
select PLATFORM_SPECIFIC_INIT select PLATFORM_SPECIFIC_INIT
select PM_DEVICE if PM select PM_DEVICE if PM
imply TIMER_READS_ITS_FREQUENCY_AT_RUNTIME