SERVICES_SR_OFFSET
regmap_read(mbox->control_scb, SERVICES_SR_OFFSET, &val);
val = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET);
regmap_read(mbox->control_scb, SERVICES_SR_OFFSET, &status);
status = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET);