spi: sprd: adi: Change hwlock to be optional

Now Spreadtrum ADI controller supplies multiple master accessing channel
to support multiple subsystems accessing, instead of using a hardware
spinlock to synchronize between the multiple subsystems.

To keep backward compatibility, we should change the hardware spinlock
to be optional. Moreover change to use of_hwspin_lock_get_id() function
which return -ENOENT error number to indicate no hwlock support.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Link: https://lore.kernel.org/r/2abe7dcf210e4197f8c5ece7fc6d6cc1eda8c655.1564125131.git.baolin.wang@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-sprd-adi.c

@@ -165,8 +165,9 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val)
 	int read_timeout = ADI_READ_TIMEOUT;
 	unsigned long flags;
 	u32 val, rd_addr;
-	int ret;
+	int ret = 0;
 
+	if (sadi->hwlock) {
 		ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
 						  ADI_HWSPINLOCK_TIMEOUT,
 						  &flags);
@@ -174,6 +175,7 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val)
 			dev_err(sadi->dev, "get the hw lock failed\n");
 			return ret;
 		}
+	}
 
 	/*
 	 * Set the physical register address need to read into RD_CMD register,
@@ -219,6 +221,7 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val)
 	*read_val = val & RD_VALUE_MASK;
 
 out:
+	if (sadi->hwlock)
 		hwspin_unlock_irqrestore(sadi->hwlock, &flags);
 	return ret;
 }
@@ -230,6 +233,7 @@ static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val)
 	unsigned long flags;
 	int ret;
 
+	if (sadi->hwlock) {
 		ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
 						  ADI_HWSPINLOCK_TIMEOUT,
 						  &flags);
@@ -237,6 +241,7 @@ static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val)
 			dev_err(sadi->dev, "get the hw lock failed\n");
 			return ret;
 		}
+	}
 
 	ret = sprd_adi_drain_fifo(sadi);
 	if (ret < 0)
@@ -261,6 +266,7 @@ static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val)
 	}
 
 out:
+	if (sadi->hwlock)
 		hwspin_unlock_irqrestore(sadi->hwlock, &flags);
 	return ret;
 }
@@ -476,17 +482,27 @@ static int sprd_adi_probe(struct platform_device *pdev)
 	sadi->slave_pbase = res->start + ADI_SLAVE_OFFSET;
 	sadi->ctlr = ctlr;
 	sadi->dev = &pdev->dev;
-	ret = of_hwspin_lock_get_id_byname(np, "adi");
-	if (ret < 0) {
-		dev_err(&pdev->dev, "can not get the hardware spinlock\n");
-		goto put_ctlr;
-	}
-
-	sadi->hwlock = devm_hwspin_lock_request_specific(&pdev->dev, ret);
+	ret = of_hwspin_lock_get_id(np, 0);
+	if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
+		sadi->hwlock =
+			devm_hwspin_lock_request_specific(&pdev->dev, ret);
 		if (!sadi->hwlock) {
 			ret = -ENXIO;
 			goto put_ctlr;
 		}
+	} else {
+		switch (ret) {
+		case -ENOENT:
+			dev_info(&pdev->dev, "no hardware spinlock supplied\n");
+			break;
+		default:
+			dev_err(&pdev->dev,
+				"failed to find hwlock id, %d\n", ret);
+			/* fall-through */
+		case -EPROBE_DEFER:
+			goto put_ctlr;
+		}
+	}
 
 	sprd_adi_hw_init(sadi);
 	sprd_adi_set_wdt_rst_mode(sadi);