diff mbox series

[V2,resend,2/4] i2c: mxc: add fuse check

Message ID 20200501140837.10326-3-peng.fan@nxp.com
State Accepted
Commit 7d1ee741d1367172eaf92c554ebf56b9cba13504
Headers show
Series support i.MX module fuse | expand

Commit Message

Peng Fan May 1, 2020, 2:08 p.m. UTC 
Add fuse check for I2C. If the fuse indicates the module
will not work in the SoC, let's fail the initialization.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/i2c/mxc_i2c.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Comments

Stefano Babic May 11, 2020, 10:17 a.m. UTC | #1 
> Add fuse check for I2C. If the fuse indicates the module
> will not work in the SoC, let's fail the initialization.
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic
diff mbox series

Patch

diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index a03c465c8f..4d6e0e3e75 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -19,6 +19,7 @@ 
 #include <dm/device_compat.h>
 #include <linux/errno.h>
 #include <asm/mach-imx/mxc_i2c.h>
+#include <asm/mach-imx/sys_proto.h>
 #include <asm/io.h>
 #include <i2c.h>
 #include <watchdog.h>
@@ -747,6 +748,14 @@  void bus_i2c_init(int index, int speed, int unused,
 		return;
 	}
 
+	if (CONFIG_IS_ENABLED(IMX_MODULE_FUSE)) {
+		if (i2c_fused((ulong)mxc_i2c_buses[index].base)) {
+			printf("SoC fuse indicates I2C at 0x%lx is unavailable.\n",
+			       (ulong)mxc_i2c_buses[index].base);
+			return;
+		}
+	}
+
 	/*
 	 * Warning: Be careful to allow the assignment to a static
 	 * variable here. This function could be called while U-Boot is
@@ -892,6 +901,14 @@  static int mxc_i2c_probe(struct udevice *bus)
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
+	if (CONFIG_IS_ENABLED(IMX_MODULE_FUSE)) {
+		if (i2c_fused((ulong)addr)) {
+			printf("SoC fuse indicates I2C at 0x%lx is unavailable.\n",
+			       (ulong)addr);
+			return -ENODEV;
+		}
+	}
+
 	i2c_bus->base = addr;
 	i2c_bus->index = bus->seq;
 	i2c_bus->bus = bus;