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drivers: clock_control: npcx: add MCLKD as i3c source clock

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1. The only valid values of MCLKD clock frequency
   are between 40Mhz to 50Mhz.
2. If DMA is used, the APB4_CLK clock frequency must
   be equal to or higher than 20Mhz.

Signed-off-by: Alvis Sun <yfsun@nuvoton.com>
This commit is contained in:
Alvis Sun 2024-04-17 10:28:16 +08:00 committed by Fabio Baltieri
parent 9b8550a24a
commit 3ed5f8a948
3 changed files with 26 additions and 1 deletions
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11
drivers/clock_control/clock_control_npcx.c
View file

@ -105,6 +105,9 @@ static int npcx_clock_control_get_subsys_rate(const struct device *dev,
case NPCX_CLOCK_BUS_FMCLK:
*rate = FMCLK;
break;
case NPCX_CLOCK_BUS_MCLKD:
*rate = OFMCLK/(MCLKD_SL + 1);
break;
default:
*rate = 0U;
/* Invalid parameters */
@ -185,6 +188,13 @@ BUILD_ASSERT(APBSRC_CLK / (APB4DIV_VAL + 1) <= MAX_OFMCLK &&
(APB4DIV_VAL + 1) % (FPRED_VAL + 1) == 0,
"Invalid APB4_CLK setting");
#endif
#if defined(CONFIG_I3C_NPCX)
BUILD_ASSERT(OFMCLK / (MCLKD_SL + 1) <= MHZ(50) &&
OFMCLK / (MCLKD_SL + 1) >= MHZ(40),
"Invalid MCLKD_SL setting");
BUILD_ASSERT(APBSRC_CLK / (APB4DIV_VAL + 1) >= MHZ(20),
"Invalid PDMA CLK setting");
#endif
static int npcx_clock_control_init(const struct device *dev)
{
@ -222,6 +232,7 @@ static int npcx_clock_control_init(const struct device *dev)
inst_cdcg->HFCBCD = VAL_HFCBCD;
inst_cdcg->HFCBCD1 = VAL_HFCBCD1;
inst_cdcg->HFCBCD2 = VAL_HFCBCD2;
inst_cdcg->HFCBCD3 = VAL_HFCBCD3;
/*
* Power-down (turn off clock) the modules initially for better

4
include/zephyr/dt-bindings/clock/npcx_clock.h
View file

@ -20,6 +20,7 @@
#define NPCX_CLOCK_BUS_FMCLK 10
#define NPCX_CLOCK_BUS_FIU0 NPCX_CLOCK_BUS_FIU
#define NPCX_CLOCK_BUS_FIU1 11
#define NPCX_CLOCK_BUS_MCLKD 12
/* clock enable/disable references */
#define NPCX_PWDWN_CTL1 0
@ -30,6 +31,7 @@
#define NPCX_PWDWN_CTL6 5
#define NPCX_PWDWN_CTL7 6
#define NPCX_PWDWN_CTL8 7
#define NPCX_PWDWN_CTL_COUNT 8
#define NPCX_PWDWN_CTL9 8
#define NPCX_PWDWN_CTL_COUNT 9
#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_CLOCK_NPCX_CLOCK_H_ */

12
soc/nuvoton/npcx/common/soc_clock.h
View file

@ -105,6 +105,16 @@ struct npcx_clk_cfg {
#endif
#endif /* CONFIG_CLOCK_CONTROL_NPCX_SUPP_FIU1 */
/* I3C clock divider */
#if (OFMCLK == MHZ(120)) /* MCLkD must between 40 mhz to 50 mhz*/
#define MCLKD_SL 2 /* I3C_CLK = (MCLK / 3) */
#elif (OFMCLK <= MHZ(100) && OFMCLK >= MHZ(80))
#define MCLKD_SL 1 /* I3C_CLK = (MCLK / 2) */
#else
#define MCLKD_SL 0 /* I3C_CLK = MCLK */
#endif
/* Get APB clock freq */
#define NPCX_APB_CLOCK(no) (APBSRC_CLK / (APB##no##DIV_VAL + 1))
@ -158,6 +168,8 @@ struct npcx_clk_cfg {
#else
#define VAL_HFCBCD2 APB3DIV_VAL
#endif /* APB4DIV_VAL */
/* I3C1~I3C3 share the same configuration */
#define VAL_HFCBCD3 MCLKD_SL
/**
* @brief Function to notify clock driver that backup the counter value of