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authorTom Warren <twarren.nvidia@gmail.com>2013-02-08 07:25:30 +0000
committerTom Warren <twarren@nvidia.com>2013-03-14 11:06:41 -0700
commite32624ef820f821b94333402788e79979681eb29 (patch)
treed328b83fe643568c319bd46c1c9458317f46ad3b /arch
parent702b87289438cfc3165408f0eaf999b0b67c1e7e (diff)
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Tegra: I2C: Add T114 clock support to tegra_i2c driver
T114 has a slightly different I2C clock, with a new (extra) divisor in standard/fast mode and HS mode. Tested on my Dalmore, and the I2C clock is 100KHz +/- 3Hz on my Saleae Logic analyzer. Added a new entry in compat_names for T114 I2C since it differs from the previous Tegra SoCs. A flag is set when T114 I2C HW is found so new features like the extra clock divisor can be used. Signed-off-by: Tom Warren <twarren@nvidia.com> Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/arch-tegra/tegra_i2c.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra/tegra_i2c.h b/arch/arm/include/asm/arch-tegra/tegra_i2c.h
index 2650744..853e59b 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_i2c.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_i2c.h
@@ -105,6 +105,7 @@ struct i2c_ctlr {
u32 sl_delay_count; /* 3C: I2C_I2C_SL_DELAY_COUNT */
u32 reserved_2[4]; /* 40: */
struct i2c_control control; /* 50 ~ 68 */
+ u32 clk_div; /* 6C: I2C_I2C_CLOCK_DIVISOR */
};
/* bit fields definitions for IO Packet Header 1 format */
@@ -154,6 +155,11 @@ struct i2c_ctlr {
#define I2C_INT_ARBITRATION_LOST_SHIFT 2
#define I2C_INT_ARBITRATION_LOST_MASK (1 << I2C_INT_ARBITRATION_LOST_SHIFT)
+/* I2C_CLK_DIVISOR_REGISTER */
+#define CLK_DIV_STD_FAST_MODE 0x19
+#define CLK_DIV_HS_MODE 1
+#define CLK_MULT_STD_FAST_MODE 8
+
/**
* Returns the bus number of the DVC controller
*