Commit 7130856f authored by Ladislav Michl's avatar Ladislav Michl Committed by Alexandre Belloni
Browse files

rtc: twl: add NVRAM support 



Export SRAM using nvmem.

Signed-off-by: default avatarLadislav Michl <ladis@linux-mips.org>
Reviewed-by: default avatarTony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/ZDf7qZTiml0ijD2g@lenoch


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 1e786b03

drivers/rtc/rtc-twl.c

+37 −0
Original line number Diff line number Diff line
@@ -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;

}