mailbox: pcc: Rename doorbell ack to platform interrupt ack register

The specification refers this register and associated bitmask as platform
interrupt acknowledge register. Let us rename it so that it is easier to
map and understand.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/pcc.c

@@ -69,14 +69,15 @@ static struct mbox_chan *pcc_mbox_channels;
  *
  * @chan: PCC channel information with Shared Memory Region info
  * @db_vaddr: cached virtual address for doorbell register
- * @db_ack_vaddr: cached virtual address for doorbell ack register
- * @db_irq: doorbell interrupt
+ * @plat_irq_ack_vaddr: cached virtual address for platform interrupt
+ *	acknowledge register
+ * @plat_irq: platform interrupt
  */
 struct pcc_chan_info {
 	struct pcc_mbox_chan chan;
 	void __iomem *db_vaddr;
-	void __iomem *db_ack_vaddr;
-	int db_irq;
+	void __iomem *plat_irq_ack_vaddr;
+	int plat_irq;
 };
 
 #define to_pcc_chan_info(c) container_of(c, struct pcc_chan_info, chan)
@@ -198,12 +199,12 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
 		doorbell_ack_preserve = pcct2_ss->ack_preserve_mask;
 		doorbell_ack_write = pcct2_ss->ack_write_mask;
 
-		ret = read_register(pchan->db_ack_vaddr,
+		ret = read_register(pchan->plat_irq_ack_vaddr,
 				    &doorbell_ack_val, doorbell_ack->bit_width);
 		if (ret)
 			return IRQ_NONE;
 
-		ret = write_register(pchan->db_ack_vaddr,
+		ret = write_register(pchan->plat_irq_ack_vaddr,
 				     (doorbell_ack_val & doorbell_ack_preserve)
 					| doorbell_ack_write,
 				     doorbell_ack->bit_width);
@@ -256,14 +257,14 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 
 	spin_unlock_irqrestore(&chan->lock, flags);
 
-	if (pchan->db_irq > 0) {
+	if (pchan->plat_irq > 0) {
 		int rc;
 
-		rc = devm_request_irq(dev, pchan->db_irq, pcc_mbox_irq, 0,
+		rc = devm_request_irq(dev, pchan->plat_irq, pcc_mbox_irq, 0,
 				      MBOX_IRQ_NAME, chan);
 		if (unlikely(rc)) {
 			dev_err(dev, "failed to register PCC interrupt %d\n",
-				pchan->db_irq);
+				pchan->plat_irq);
 			pcc_mbox_free_channel(&pchan->chan);
 			return ERR_PTR(rc);
 		}
@@ -288,8 +289,8 @@ void pcc_mbox_free_channel(struct pcc_mbox_chan *pchan)
 	if (!chan || !chan->cl)
 		return;
 
-	if (pchan_info->db_irq > 0)
-		devm_free_irq(chan->mbox->dev, pchan_info->db_irq, chan);
+	if (pchan_info->plat_irq > 0)
+		devm_free_irq(chan->mbox->dev, pchan_info->plat_irq, chan);
 
 	spin_lock_irqsave(&chan->lock, flags);
 	chan->cl = NULL;
@@ -400,9 +401,9 @@ static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
 		return 0;
 
 	pcct_ss = (struct acpi_pcct_hw_reduced *)pcct_entry;
-	pchan->db_irq = pcc_map_interrupt(pcct_ss->platform_interrupt,
-					  (u32)pcct_ss->flags);
-	if (pchan->db_irq <= 0) {
+	pchan->plat_irq = pcc_map_interrupt(pcct_ss->platform_interrupt,
+					    (u32)pcct_ss->flags);
+	if (pchan->plat_irq <= 0) {
 		pr_err("PCC GSI %d not registered\n",
 		       pcct_ss->platform_interrupt);
 		return -EINVAL;
@@ -411,10 +412,10 @@ static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
 	if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
 		struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss;
 
-		pchan->db_ack_vaddr =
+		pchan->plat_irq_ack_vaddr =
 			acpi_os_ioremap(pcct2_ss->platform_ack_register.address,
 					pcct2_ss->platform_ack_register.bit_width / 8);
-		if (!pchan->db_ack_vaddr) {
+		if (!pchan->plat_irq_ack_vaddr) {
 			pr_err("Failed to ioremap PCC ACK register\n");
 			return -ENOMEM;
 		}