imx: Add error checking to setup_i2c()

Since this function can fail, check its return value.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Nikita Kiryanov <nikita@compulab.co.il>

diff --git a/arch/arm/imx-common/i2c-mxv7.c b/arch/arm/imx-common/i2c-mxv7.c
index a58087399cedc8786983d5a41268e97976ee07e9..70cff5cc8d3a8865bcc7cc4ded88590e11c37c3e 100644 (file)
--- a/arch/arm/imx-common/i2c-mxv7.c
+++ b/arch/arm/imx-common/i2c-mxv7.c
@@ -69,15 +69,29 @@ static void * const i2c_bases[] = {
 };
 
 /* i2c_index can be from 0 - 2 */
-void setup_i2c(unsigned i2c_index, int speed, int slave_addr,
-               struct i2c_pads_info *p)
+int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
+             struct i2c_pads_info *p)
 {
+       int ret;
+
        if (i2c_index >= ARRAY_SIZE(i2c_bases))
-               return;
+               return -EINVAL;
        /* Enable i2c clock */
-       enable_i2c_clk(1, i2c_index);
+       ret = enable_i2c_clk(1, i2c_index);
+       if (ret)
+               goto err_clk;
+
        /* Make sure bus is idle */
-       force_idle_bus(p);
+       ret = force_idle_bus(p);
+       if (ret)
+               goto err_idle;
+
        bus_i2c_init(i2c_bases[i2c_index], speed, slave_addr,
                        force_idle_bus, p);
+
+       return 0;
+
+err_idle:
+err_clk:
+       return ret;
 }

diff --git a/arch/arm/include/asm/imx-common/mxc_i2c.h b/arch/arm/include/asm/imx-common/mxc_i2c.h
index 182c2f397f1748d0f574a4ffaa9a31335475fba5..af861635350d00209405435084ef767bec5b77e6 100644 (file)
--- a/arch/arm/include/asm/imx-common/mxc_i2c.h
+++ b/arch/arm/include/asm/imx-common/mxc_i2c.h
@@ -52,8 +52,8 @@ struct i2c_pads_info {
                                        &mx6q_##name : &mx6s_##name
 #endif
 
-void setup_i2c(unsigned i2c_index, int speed, int slave_addr,
-               struct i2c_pads_info *p);
+int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
+             struct i2c_pads_info *p);
 void bus_i2c_init(void *base, int speed, int slave_addr,
                int (*idle_bus_fn)(void *p), void *p);
 int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf,

diff --git a/board/compulab/cm_fx6/cm_fx6.c b/board/compulab/cm_fx6/cm_fx6.c
index fdb8ebf9e75567c41965d4018b306f2266ffc5e8..9c6e686d3046cc52477b40c1167143576b5a2a55 100644 (file)
--- a/board/compulab/cm_fx6/cm_fx6.c
+++ b/board/compulab/cm_fx6/cm_fx6.c
@@ -141,14 +141,36 @@ I2C_PADS(i2c2_pads,
         IMX_GPIO_NR(1, 6));
 
 
-static void cm_fx6_setup_i2c(void)
+static int cm_fx6_setup_one_i2c(int busnum, struct i2c_pads_info *pads)
 {
-       setup_i2c(0, CONFIG_SYS_I2C_SPEED, 0x7f, I2C_PADS_INFO(i2c0_pads));
-       setup_i2c(1, CONFIG_SYS_I2C_SPEED, 0x7f, I2C_PADS_INFO(i2c1_pads));
-       setup_i2c(2, CONFIG_SYS_I2C_SPEED, 0x7f, I2C_PADS_INFO(i2c2_pads));
+       int ret;
+
+       ret = setup_i2c(busnum, CONFIG_SYS_I2C_SPEED, 0x7f, pads);
+       if (ret)
+               printf("Warning: I2C%d setup failed: %d\n", busnum, ret);
+
+       return ret;
+}
+
+static int cm_fx6_setup_i2c(void)
+{
+       int ret = 0, err;
+
+       /* i2c<x>_pads are wierd macro variables; we can't use an array */
+       err = cm_fx6_setup_one_i2c(0, I2C_PADS_INFO(i2c0_pads));
+       if (err)
+               ret = err;
+       err = cm_fx6_setup_one_i2c(1, I2C_PADS_INFO(i2c1_pads));
+       if (err)
+               ret = err;
+       err = cm_fx6_setup_one_i2c(2, I2C_PADS_INFO(i2c2_pads));
+       if (err)
+               ret = err;
+
+       return ret;
 }
 #else
-static void cm_fx6_setup_i2c(void) { }
+static int cm_fx6_setup_i2c(void) { return 0; }
 #endif
 
 #ifdef CONFIG_USB_EHCI_MX6
@@ -409,9 +431,15 @@ void ft_board_setup(void *blob, bd_t *bd)
 
 int board_init(void)
 {
+       int ret;
+
        gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
        cm_fx6_setup_gpmi_nand();
-       cm_fx6_setup_i2c();
+
+       /* Warn on failure but do not abort boot */
+       ret = cm_fx6_setup_i2c();
+       if (ret)
+               printf("Warning: I2C setup failed: %d\n", ret);
 
        return 0;
 }