At present we enable the sandbox I2C driver for all builds. Add a separate
Kconfig option to control this, so that it can be disabled in TPL, where
it is not needed.

Signed-off-by: Simon Glass <s...@chromium.org>
---

(no changes since v1)

 drivers/i2c/Kconfig | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index ec533f31b1a..b1b846da05f 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -47,6 +47,16 @@ config SPL_DM_I2C
          device (bus child) info is kept as parent platdata. The interface
          is defined in include/i2c.h.
 
+config TPL_DM_I2C
+       bool "Enable Driver Model for I2C drivers in TPL"
+       depends on TPL_DM && DM_I2C
+       help
+         Enable driver model for I2C. The I2C uclass interface: probe, read,
+         write and speed, is implemented with the bus drivers operations,
+         which provide methods for bus setting and data transfer. Each chip
+         device (bus child) info is kept as parent platdata. The interface
+         is defined in include/i2c.h.
+
 config VPL_DM_I2C
        bool "Enable Driver Model for I2C drivers in VPL"
        depends on VPL_DM && DM_I2C
@@ -504,6 +514,16 @@ config SYS_I2C_ROCKCHIP
 config SYS_I2C_SANDBOX
        bool "Sandbox I2C driver"
        depends on SANDBOX && DM_I2C
+       default y
+       help
+         Enable I2C support for sandbox. This is an emulation of a real I2C
+         bus. Devices can be attached to the bus using the device tree
+         which specifies the driver to use.  See sandbox.dts as an example.
+
+config SPL_SYS_I2C_SANDBOX
+       bool "Sandbox I2C driver (SPL)"
+       depends on SPL && SANDBOX && DM_I2C
+       default y
        help
          Enable I2C support for sandbox. This is an emulation of a real I2C
          bus. Devices can be attached to the bus using the device tree
-- 
2.39.1.581.gbfd45094c4-goog

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