mmc: core: Extend sysfs to ext_csd parameters for RPMB support

Extend current sysfs access to ext_csd rpmb parameters (RPMB partition
size) and rel_sector information.

Signed-off-by: Loic Pallardy <[e-mail]>
Reviewed-by: Namjae Jeon <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Acked-by: Johan Rudholm <[e-mail]>
Acked-by: Krishna Konda <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

Documentation/mmc/mmc-dev-attrs.txt

···
 	serial			Product Serial Number (from CID Register)
 	erase_size		Erase group size
 	preferred_erase_size	Preferred erase size
+	raw_rpmb_size_mult	RPMB partition size
+	rel_sectors		Reliable write sector count
 
 Note on Erase Size and Preferred Erase Size:
 
···
 	size specified by the card.
 
 	"preferred_erase_size" is in bytes.
+
+Note on raw_rpmb_size_mult:
+	"raw_rpmb_size_mult" is a mutliple of 128kB block.
+	RPMB size in byte is calculated by using the following equation:
+	RPMB partition size = 128kB x raw_rpmb_size_mult
 
 SD/MMC/SDIO Clock Gating Attribute
 ==================================

drivers/mmc/core/mmc.c

···
 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 		card->ext_csd.enhanced_area_offset);
 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
+MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
+MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,
···
 	&dev_attr_serial.attr,
 	&dev_attr_enhanced_area_offset.attr,
 	&dev_attr_enhanced_area_size.attr,
+	&dev_attr_raw_rpmb_size_mult.attr,
+	&dev_attr_rel_sectors.attr,
 	NULL,
 };