From: Fabio Estevam <fabio.estevam@freescale.com>
Date: Mon, 23 Apr 2012 08:30:49 +0000 (+0000)
Subject: spi: mxs: Introduce spi_cs_is_valid()
X-Git-Tag: v2012.07-rc1~144^2~60
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=79cb14ab39f970b85204ab1b2f796b02bb65335d;p=oweals%2Fu-boot.git

spi: mxs: Introduce spi_cs_is_valid()

Introduce spi_cs_is_valid() for validating spi bus and chip select numbers.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
---

diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c
index 4e6f14ee07..e7237e720a 100644
--- a/drivers/spi/mxs_spi.c
+++ b/drivers/spi/mxs_spi.c
@@ -51,14 +51,23 @@ void spi_init(void)
 {
 }
 
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	/* MXS SPI: 4 ports and 3 chip selects maximum */
+	if (bus > 3 || cs > 2)
+		return 0;
+	else
+		return 1;
+}
+
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
 				  unsigned int max_hz, unsigned int mode)
 {
 	struct mxs_spi_slave *mxs_slave;
 	uint32_t addr;
 
-	if (bus > 3) {
-		printf("MXS SPI: Max bus number is 3\n");
+	if (!spi_cs_is_valid(bus, cs)) {
+		printf("mxs_spi: invalid bus %d / chip select %d\n", bus, cs);
 		return NULL;
 	}