driver: i2c: npcx: support APB clock of i2c modules up to 20MHz.
Support APB clock of npcx i2c modules up to 20MHz and add releted timing
settings.
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
diff --git a/drivers/i2c/i2c_npcx_controller.c b/drivers/i2c/i2c_npcx_controller.c
index ff919c4..4a9f74c 100644
--- a/drivers/i2c/i2c_npcx_controller.c
+++ b/drivers/i2c/i2c_npcx_controller.c
@@ -145,6 +145,7 @@
uint8_t *ptr_msg; /* current msg pointer for FIFO read/write */
uint16_t addr; /* slave address of transcation */
uint8_t port; /* current port used the controller */
+ const struct npcx_i2c_timing_cfg *ptr_speed_confs;
};
/* Driver convenience defines */
@@ -158,12 +159,18 @@
(struct smb_fifo_reg *)(DRV_CONFIG(dev)->base)
/* Recommended I2C timing values are based on 15 MHz */
-static const struct npcx_i2c_timing_cfg npcx_speed_confs[] = {
+static const struct npcx_i2c_timing_cfg npcx_15m_speed_confs[] = {
[NPCX_I2C_BUS_SPEED_100KHZ] = {.HLDT = 0, .k1 = 75, .k2 = 0},
[NPCX_I2C_BUS_SPEED_400KHZ] = {.HLDT = 7, .k1 = 24, .k2 = 18,},
[NPCX_I2C_BUS_SPEED_1MHZ] = {.HLDT = 7, .k1 = 14, .k2 = 10,},
};
+static const struct npcx_i2c_timing_cfg npcx_20m_speed_confs[] = {
+ [NPCX_I2C_BUS_SPEED_100KHZ] = {.HLDT = 0, .k1 = 100, .k2 = 0},
+ [NPCX_I2C_BUS_SPEED_400KHZ] = {.HLDT = 7, .k1 = 32, .k2 = 22},
+ [NPCX_I2C_BUS_SPEED_1MHZ] = {.HLDT = 7, .k1 = 16, .k2 = 10},
+};
+
/* I2C controller inline functions access shared registers */
static inline void i2c_ctrl_start(const struct device *dev)
{
@@ -330,7 +337,9 @@
enum npcx_i2c_freq bus_freq)
{
struct smb_reg *const inst = HAL_I2C_INSTANCE(dev);
- const struct npcx_i2c_timing_cfg bus_cfg = npcx_speed_confs[bus_freq];
+ struct i2c_ctrl_data *const data = DRV_DATA(dev);
+ const struct npcx_i2c_timing_cfg bus_cfg =
+ data->ptr_speed_confs[bus_freq];
/* Switch to bank 0 to configure bus speed */
i2c_ctrl_bank_sel(dev, NPCX_I2C_BANK_NORMAL);
@@ -871,7 +880,15 @@
LOG_ERR("Get %s clock rate error.", dev->name);
return -EIO;
}
- __ASSERT(i2c_rate == 15000000, "Unsupported apb2/3 freq for I2C!");
+
+ if (i2c_rate == 15000000)
+ data->ptr_speed_confs = npcx_15m_speed_confs;
+ else if (i2c_rate == 20000000) {
+ data->ptr_speed_confs = npcx_20m_speed_confs;
+ } else {
+ LOG_ERR("Unsupported apb2/3 freq for %s.", dev->name);
+ return -EIO;
+ }
/* Initialize i2c module */
i2c_ctrl_init_module(dev);
