Hi Tobias,
i have been working on an update to ramips the last weeks, which bumps
the kernel tot the upstream OF enabled one. This update will superseed
your patch. we are currently not merging any patches based on the old
code pattern.
i will try to make an image for you to test using a devicetree with the
i2c-gpio driver enabled and i2c-tools added if that is ok.
John
On 01/04/13 00:59, Tobias Diedrich wrote:
Add I2C gpio platform data.
This is useful for the Carambola dev board (and maybe others if they
use I2C).
Signed-off-by: Tobias Diedrich<ranma+open...@tdiedrich.de>
Index: a/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.c
===================================================================
--- b/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.c
2013-03-31 23:21:42.992809485 +0200
+++ a/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.c
2013-03-31 23:21:50.142819472 +0200
@@ -12,6 +12,7 @@
#include<linux/platform_device.h>
#include<linux/err.h>
#include<linux/clk.h>
+#include<linux/i2c-gpio.h>
#include<linux/mtd/mtd.h>
#include<linux/mtd/physmap.h>
#include<linux/spi/spi.h>
@@ -260,6 +261,33 @@
platform_device_register(&rt305x_wdt_device);
}
+static struct i2c_gpio_platform_data rt305x_i2c_pdata = {
+ .sda_pin = RT305X_GPIO_I2C_SD,
+ .scl_pin = RT305X_GPIO_I2C_SCLK,
+ .sda_is_open_drain = 0,
+ .scl_is_open_drain = 0,
+ .udelay = 10,
+};
+
+static struct platform_device rt305x_i2c_device = {
+ .name = "i2c-gpio",
+ .id = 0,
+ .dev = {
+ .platform_data =&rt305x_i2c_pdata,
+ },
+};
+
+void __init rt305x_register_i2c(void)
+{
+ /*
+ * There is even a dedicated i2c controller block, but it is probably
+ * not worth implementing support for the minimal speed gain.
+ * Just use the generic linux bitbanging and register the necessary
+ * platform data for the default I2C pin mapping the HW would use.
+ */
+ platform_device_register(&rt305x_i2c_device);
+}
+
static struct resource rt305x_spi_resources[] = {
{
.flags = IORESOURCE_MEM,
Index: a/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.h
===================================================================
--- b/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.h
2013-03-31 23:21:42.992809485 +0200
+++ a/target/linux/ramips/files/arch/mips/ralink/rt305x/devices.h
2013-03-31 23:21:42.982809471 +0200
@@ -23,6 +23,7 @@
void rt305x_register_flash(unsigned int id);
void rt305x_register_ethernet(void);
+void rt305x_register_i2c(void);
void rt305x_register_wifi(void);
void rt305x_register_wdt(void);
void rt305x_register_spi(struct spi_board_info *info, int n);
Index: a/target/linux/ramips/files/arch/mips/ralink/rt305x/mach-carambola.c
===================================================================
--- b/target/linux/ramips/files/arch/mips/ralink/rt305x/mach-carambola.c
2013-03-31 23:21:42.992809485 +0200
+++ a/target/linux/ramips/files/arch/mips/ralink/rt305x/mach-carambola.c
2013-03-31 23:21:42.982809471 +0200
@@ -36,6 +36,7 @@
rt305x_register_wifi();
rt305x_register_wdt();
rt305x_register_usb();
+ rt305x_register_i2c(); /* platform data for i2c-gpio */
}
MIPS_MACHINE(RAMIPS_MACH_CARAMBOLA, "CARAMBOLA", "8devices Carambola",
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