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rtc: twl: add NVRAM support 

Export SRAM using nvmem.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/ZDf7qZTiml0ijD2g@lenoch
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Ladislav Michl 2022-05-28 19:36:13 +02:00 committed by Alexandre Belloni
parent 1e786b0370
commit 7130856f56
1 changed files with 37 additions and 0 deletions
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37
drivers/rtc/rtc-twl.c
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@ -487,11 +487,24 @@ static const struct rtc_class_ops twl_rtc_ops = {
.alarm_irq_enable = twl_rtc_alarm_irq_enable,
};
static int twl_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return twl_i2c_read((long)priv, val, offset, bytes);
}
static int twl_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return twl_i2c_write((long)priv, val, offset, bytes);
}
/*----------------------------------------------------------------------*/
static int twl_rtc_probe(struct platform_device *pdev)
{
struct twl_rtc *twl_rtc;
struct nvmem_config nvmem_cfg;
struct device_node *np = pdev->dev.of_node;
int ret = -EINVAL;
int irq = platform_get_irq(pdev, 0);
@ -579,6 +592,30 @@ static int twl_rtc_probe(struct platform_device *pdev)
return ret;
}
memset(&nvmem_cfg, 0, sizeof(nvmem_cfg));
nvmem_cfg.name = "twl-secured-";
nvmem_cfg.type = NVMEM_TYPE_BATTERY_BACKED;
nvmem_cfg.reg_read = twl_nvram_read,
nvmem_cfg.reg_write = twl_nvram_write,
nvmem_cfg.word_size = 1;
nvmem_cfg.stride = 1;
if (twl_class_is_4030()) {
/* 20 bytes SECURED_REG area */
nvmem_cfg.size = 20;
nvmem_cfg.priv = (void *)TWL_MODULE_SECURED_REG;
devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
/* 8 bytes BACKUP area */
nvmem_cfg.name = "twl-backup-";
nvmem_cfg.size = 8;
nvmem_cfg.priv = (void *)TWL4030_MODULE_BACKUP;
devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
} else {
/* 8 bytes SECURED_REG area */
nvmem_cfg.size = 8;
nvmem_cfg.priv = (void *)TWL_MODULE_SECURED_REG;
devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
}
return 0;
}