mtd: spi: Fix logging in spi-nor-tiny

This fixes dev_xxx() not always being called with a device. In
spi_nor_reg_read, a the slave device may not always be available, so we use
bus and cs instead.
Signed-off-by: NSean Anderson <seanga2@gmail.com>
Tested-by: NPatrick Delaunay <patrick.delaunay@st.com>

drivers/mtd/spi/spi-nor-tiny.c

@@ -55,9 +55,19 @@ static int spi_nor_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
 	int ret;
 
 	ret = spi_nor_read_write_reg(nor, &op, val);
-	if (ret < 0)
-		dev_dbg(&flash->spimem->spi->dev, "error %d reading %x\n", ret,
+	if (ret < 0) {
+		/*
+		 * spi_slave does not have a struct udevice member without DM,
+		 * so use the bus and cs instead.
+		 */
+#if CONFIG_IS_ENABLED(DM_SPI)
+		dev_dbg(nor->spi->dev, "error %d reading %x\n", ret,
 			code);
+#else
+		log_debug("spi%u.%u: error %d reading %x\n",
+			  nor->spi->bus, nor->spi->cs, ret, code);
+#endif
+	}
 
 	return ret;
 }
@@ -512,7 +522,8 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
 	/* Check current Quad Enable bit value. */
 	ret = read_cr(nor);
 	if (ret < 0) {
-		dev_dbg(dev, "error while reading configuration register\n");
+		dev_dbg(nor->dev,
+			"error while reading configuration register\n");
 		return -EINVAL;
 	}
 
@@ -524,7 +535,7 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
 	/* Keep the current value of the Status Register. */
 	ret = read_sr(nor);
 	if (ret < 0) {
-		dev_dbg(dev, "error while reading status register\n");
+		dev_dbg(nor->dev, "error while reading status register\n");
 		return -EINVAL;
 	}
 	sr_cr[0] = ret;
@@ -785,7 +796,7 @@ int spi_nor_scan(struct spi_nor *nor)
 	}
 
 	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
-		dev_dbg(dev, "address width is too large: %u\n",
+		dev_dbg(nor->dev, "address width is too large: %u\n",
 			nor->addr_width);
 		return -EINVAL;
 	}