dm: spi: Change cs_info op to return -EINVAL for invalid cs num

We need distinguish the following two situations in various SPI APIs:

- given chip select num is invalid
- given chip select num is valid, but no device is attached

Currently -ENODEV is returned for both cases.

For the first case, it's more reasonable to return -EINVAL instead of
-ENODEV for invalid chip select numbers.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # SoPine
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

drivers/spi/ath79_spi.c

@@ -198,7 +198,7 @@ static int ath79_cs_info(struct udevice *bus, uint cs,
 {
 	/* Always allow activity on CS 0/1/2 */
 	if (cs >= 3)
-		return -ENODEV;
+		return -EINVAL;
 
 	return 0;
 }

drivers/spi/bcm63xx_hsspi.c

@@ -108,7 +108,7 @@ static int bcm63xx_hsspi_cs_info(struct udevice *bus, uint cs,
 
 	if (cs >= priv->num_cs) {
 		printf("no cs %u\n", cs);
-		return -ENODEV;
+		return -EINVAL;
 	}
 
 	return 0;

drivers/spi/bcm63xx_spi.c

@@ -130,7 +130,7 @@ static int bcm63xx_spi_cs_info(struct udevice *bus, uint cs,
 
 	if (cs >= priv->num_cs) {
 		printf("no cs %u\n", cs);
-		return -ENODEV;
+		return -EINVAL;
 	}
 
 	return 0;

drivers/spi/sandbox_spi.c

@@ -117,7 +117,7 @@ static int sandbox_cs_info(struct udevice *bus, uint cs,
 {
 	/* Always allow activity on CS 0 */
 	if (cs >= 1)
-		return -ENODEV;
+		return -EINVAL;
 
 	return 0;
 }

drivers/spi/tegra20_sflash.c

@@ -78,7 +78,7 @@ int tegra20_sflash_cs_info(struct udevice *bus, unsigned int cs,
 {
 	/* Tegra20 SPI-Flash - only 1 device ('bus/cs') */
 	if (cs != 0)
-		return -ENODEV;
+		return -EINVAL;
 	else
 		return 0;
 }