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Diffstat (limited to 'arch/arm/plat-omap/i2c.c')
-rw-r--r--arch/arm/plat-omap/i2c.c104
1 files changed, 89 insertions, 15 deletions
diff --git a/arch/arm/plat-omap/i2c.c b/arch/arm/plat-omap/i2c.c
index 467531edefd..a303071d5e3 100644
--- a/arch/arm/plat-omap/i2c.c
+++ b/arch/arm/plat-omap/i2c.c
@@ -98,6 +98,8 @@ static const int omap34xx_pins[][2] = {
static const int omap34xx_pins[][2] = {};
#endif
+#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
+
static void __init omap_i2c_mux_pins(int bus)
{
int scl, sda;
@@ -119,14 +121,9 @@ static void __init omap_i2c_mux_pins(int bus)
omap_cfg_reg(scl);
}
-int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
- struct i2c_board_info const *info,
- unsigned len)
+static int __init omap_i2c_nr_ports(void)
{
- int ports, err;
- struct platform_device *pdev;
- struct resource *res;
- resource_size_t base, irq;
+ int ports = 0;
if (cpu_class_is_omap1())
ports = 1;
@@ -135,17 +132,16 @@ int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
else if (cpu_is_omap34xx())
ports = 3;
- BUG_ON(bus_id < 1 || bus_id > ports);
+ return ports;
+}
- if (info) {
- err = i2c_register_board_info(bus_id, info, len);
- if (err)
- return err;
- }
+static int __init omap_i2c_add_bus(int bus_id)
+{
+ struct platform_device *pdev;
+ struct resource *res;
+ resource_size_t base, irq;
pdev = &omap_i2c_devices[bus_id - 1];
- *(u32 *)pdev->dev.platform_data = clkrate;
-
if (bus_id == 1) {
res = pdev->resource;
if (cpu_class_is_omap1()) {
@@ -163,3 +159,81 @@ int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
omap_i2c_mux_pins(bus_id - 1);
return platform_device_register(pdev);
}
+
+/**
+ * omap_i2c_bus_setup - Process command line options for the I2C bus speed
+ * @str: String of options
+ *
+ * This function allow to override the default I2C bus speed for given I2C
+ * bus with a command line option.
+ *
+ * Format: i2c_bus=bus_id,clkrate (in kHz)
+ *
+ * Returns 1 on success, 0 otherwise.
+ */
+static int __init omap_i2c_bus_setup(char *str)
+{
+ int ports;
+ int ints[3];
+
+ ports = omap_i2c_nr_ports();
+ get_options(str, 3, ints);
+ if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
+ return 0;
+ i2c_rate[ints[1] - 1] = ints[2];
+ i2c_rate[ints[1] - 1] |= OMAP_I2C_CMDLINE_SETUP;
+
+ return 1;
+}
+__setup("i2c_bus=", omap_i2c_bus_setup);
+
+/*
+ * Register busses defined in command line but that are not registered with
+ * omap_register_i2c_bus from board initialization code.
+ */
+static int __init omap_register_i2c_bus_cmdline(void)
+{
+ int i, err = 0;
+
+ for (i = 0; i < ARRAY_SIZE(i2c_rate); i++)
+ if (i2c_rate[i] & OMAP_I2C_CMDLINE_SETUP) {
+ i2c_rate[i] &= ~OMAP_I2C_CMDLINE_SETUP;
+ err = omap_i2c_add_bus(i + 1);
+ if (err)
+ goto out;
+ }
+
+out:
+ return err;
+}
+subsys_initcall(omap_register_i2c_bus_cmdline);
+
+/**
+ * omap_register_i2c_bus - register I2C bus with device descriptors
+ * @bus_id: bus id counting from number 1
+ * @clkrate: clock rate of the bus in kHz
+ * @info: pointer into I2C device descriptor table or NULL
+ * @len: number of descriptors in the table
+ *
+ * Returns 0 on success or an error code.
+ */
+int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
+ struct i2c_board_info const *info,
+ unsigned len)
+{
+ int err;
+
+ BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
+
+ if (info) {
+ err = i2c_register_board_info(bus_id, info, len);
+ if (err)
+ return err;
+ }
+
+ if (!i2c_rate[bus_id - 1])
+ i2c_rate[bus_id - 1] = clkrate;
+ i2c_rate[bus_id - 1] &= ~OMAP_I2C_CMDLINE_SETUP;
+
+ return omap_i2c_add_bus(bus_id);
+}