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drivers: eeprom: mchp: Enable low power feature

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Updated the driver to support low power mode

Signed-off-by: Manimaran A <manimaran.a@microchip.com>
This commit is contained in:
Manimaran A 2023-08-07 15:21:53 +05:30 committed by Fabio Baltieri
parent b990082bef
commit 207e5c77d4
3 changed files with 94 additions and 5 deletions
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56
drivers/eeprom/eeprom_mchp_xec.c
View file

@ -14,6 +14,9 @@
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/logging/log.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/policy.h>
LOG_MODULE_REGISTER(eeprom_xec, CONFIG_EEPROM_LOG_LEVEL);
/* EEPROM Mode Register */
@ -238,7 +241,9 @@ static int eeprom_xec_read(const struct device *dev, off_t offset,
}
k_mutex_lock(&data->lock_mtx, K_FOREVER);
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
/* EEPROM HW READ */
for (chunk_idx = 0; chunk_idx < len; chunk_idx += XEC_EEPROM_TRANSFER_SIZE_READ) {
if ((len-chunk_idx) < XEC_EEPROM_TRANSFER_SIZE_READ) {
@ -247,7 +252,9 @@ static int eeprom_xec_read(const struct device *dev, off_t offset,
eeprom_xec_data_read_32_bytes(regs, &data_buf[chunk_idx],
chunk_size, (offset+chunk_idx));
}
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
k_mutex_unlock(&data->lock_mtx);
return 0;
@ -273,7 +280,9 @@ static int eeprom_xec_write(const struct device *dev, off_t offset,
}
k_mutex_lock(&data->lock_mtx, K_FOREVER);
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
/* EEPROM HW WRITE */
for (chunk_idx = 0; chunk_idx < len; chunk_idx += XEC_EEPROM_TRANSFER_SIZE_WRITE) {
if ((len-chunk_idx) < XEC_EEPROM_TRANSFER_SIZE_WRITE) {
@ -282,7 +291,9 @@ static int eeprom_xec_write(const struct device *dev, off_t offset,
eeprom_xec_data_write_32_bytes(regs, &data_buf[chunk_idx],
chunk_size, (offset+chunk_idx));
}
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
k_mutex_unlock(&data->lock_mtx);
return 0;
@ -295,6 +306,39 @@ static size_t eeprom_xec_size(const struct device *dev)
return config->size;
}
#ifdef CONFIG_PM_DEVICE
static int eeprom_xec_pm_action(const struct device *dev, enum pm_device_action action)
{
const struct eeprom_xec_config *const devcfg = dev->config;
struct eeprom_xec_regs * const regs = devcfg->regs;
int ret;
switch (action) {
case PM_DEVICE_ACTION_RESUME:
ret = pinctrl_apply_state(devcfg->pcfg, PINCTRL_STATE_DEFAULT);
if (ret != 0) {
LOG_ERR("XEC EEPROM pinctrl setup failed (%d)", ret);
return ret;
}
regs->mode |= XEC_EEPROM_MODE_ACTIVATE;
break;
case PM_DEVICE_ACTION_SUSPEND:
/* Disable EEPROM Controller */
regs->mode &= (~XEC_EEPROM_MODE_ACTIVATE);
ret = pinctrl_apply_state(devcfg->pcfg, PINCTRL_STATE_SLEEP);
/* pinctrl-1 does not exist. */
if (ret == -ENOENT) {
ret = 0;
}
break;
default:
ret = -ENOTSUP;
}
return ret;
}
#endif /* CONFIG_PM_DEVICE */
static int eeprom_xec_init(const struct device *dev)
{
const struct eeprom_xec_config *config = dev->config;
@ -331,6 +375,8 @@ static const struct eeprom_xec_config eeprom_config = {
static struct eeprom_xec_data eeprom_data;
DEVICE_DT_INST_DEFINE(0, &eeprom_xec_init, NULL, &eeprom_data,
PM_DEVICE_DT_INST_DEFINE(0, eeprom_xec_pm_action);
DEVICE_DT_INST_DEFINE(0, &eeprom_xec_init, PM_DEVICE_DT_INST_GET(0), &eeprom_data,
&eeprom_config, POST_KERNEL,
CONFIG_EEPROM_INIT_PRIORITY, &eeprom_xec_api);

22
dts/arm/microchip/mec152x/mec152xhsz-pinctrl.dtsi
View file

@ -1152,4 +1152,26 @@
pwm8_alt_gpio175_sleep: pwm8_alt_gpio175_sleep {
pinmux = < MCHP_XEC_PINMUX(0175, MCHP_AF3) >;
};
/* EEPROM */
pspi_cs_n_gpio116_sleep: pspi_cs_n_gpio116_sleep {
pinmux = < MCHP_XEC_PINMUX(0116, MCHP_AF2) >;
low-power-enable;
};
pspi_clk_gpio117_sleep: pspi_clk_gpio117_sleep {
pinmux = < MCHP_XEC_PINMUX(0117, MCHP_AF2) >;
low-power-enable;
};
pspi_mosi_gpio074_sleep: pspi_mosi_gpio074_sleep {
pinmux = < MCHP_XEC_PINMUX(074, MCHP_AF2) >;
low-power-enable;
};
pspi_miso_gpio075_sleep: pspi_miso_gpio075_sleep {
pinmux = < MCHP_XEC_PINMUX(075, MCHP_AF2) >;
low-power-enable;
};
};

21
dts/arm/microchip/mec172x/mec172xnsz-pinctrl.dtsi
View file

@ -1183,4 +1183,25 @@
low-power-enable;
};
/* EEPROM */
eeprom_cs_gpio116_sleep: eeprom_cs_gpio116_sleep {
pinmux = < MCHP_XEC_PINMUX(0116, MCHP_AF2) >;
low-power-enable;
};
eeprom_clk_gpio117_sleep: eeprom_clk_gpio117_sleep {
pinmux = < MCHP_XEC_PINMUX(0117, MCHP_AF2) >;
low-power-enable;
};
eeprom_mosi_gpio074_sleep: eeprom_mosi_gpio074_sleep {
pinmux = < MCHP_XEC_PINMUX(074, MCHP_AF2) >;
low-power-enable;
};
eeprom_miso_gpio075_sleep: eeprom_miso_gpio075_sleep {
pinmux = < MCHP_XEC_PINMUX(075, MCHP_AF2) >;
low-power-enable;
};
};