mmc: core: Extend sysfs with OCR register

Registers CID and CSD are already exported through sysfs so let's make
this interface complete by adding missing OCR register.
Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/mmc/mmc-dev-attrs.txt

@@ -28,6 +28,7 @@ All attributes are read-only.
 	preferred_erase_size	Preferred erase size
 	raw_rpmb_size_mult	RPMB partition size
 	rel_sectors		Reliable write sector count
+	ocr 			Operation Conditions Register
 
 Note on Erase Size and Preferred Erase Size:
 

drivers/mmc/core/mmc.c

@@ -749,6 +749,7 @@ MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 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);
+MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
 
 static ssize_t mmc_fwrev_show(struct device *dev,
 			      struct device_attribute *attr,
@@ -784,6 +785,7 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_enhanced_area_size.attr,
 	&dev_attr_raw_rpmb_size_mult.attr,
 	&dev_attr_rel_sectors.attr,
+	&dev_attr_ocr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(mmc_std);

drivers/mmc/core/sd.c

@@ -675,6 +675,7 @@ MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
+MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
 
 
 static struct attribute *sd_std_attrs[] = {
@@ -690,6 +691,7 @@ static struct attribute *sd_std_attrs[] = {
 	&dev_attr_name.attr,
 	&dev_attr_oemid.attr,
 	&dev_attr_serial.attr,
+	&dev_attr_ocr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(sd_std);