Hello Rajeshwari,
On 14.11.2012 10:11, Rajeshwari Shinde wrote:
Functions added to get the I2C bus number and reset I2C bus using FDT node.
Signed-off-by: Simon Glasssjg@chromium.org Signed-off-by: Rajeshwari Shinderajeshwari.s@samsung.com
Changes in V2:
- Added periph id to I2C bus structure.
- Modified i2c_get_bus_num_fdt function to compare with node.
- Board i2c init moved to driver in case of FDT.
drivers/i2c/s3c24x0_i2c.c | 90 ++++++++++++++++++++++++++++++++++++++++++++- drivers/i2c/s3c24x0_i2c.h | 8 ++++ include/i2c.h | 26 +++++++++++++ 3 files changed, 123 insertions(+), 1 deletions(-)
patch looks good, just some nitpicking comments ...
diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c index 9bc4c7f..840585d 100644 --- a/drivers/i2c/s3c24x0_i2c.c +++ b/drivers/i2c/s3c24x0_i2c.c
[...]
@@ -507,4 +516,83 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) (i2c, I2C_WRITE, chip<< 1,&xaddr[4 - alen], alen, buffer, len) != 0); }
+#ifdef CONFIG_OF_CONTROL +void board_i2c_init(const void *blob) +{
- int node_list[CONFIG_MAX_I2C_NUM];
- int count, i;
- count = fdtdec_find_aliases_for_id(blob, "i2c",
COMPAT_SAMSUNG_S3C2440_I2C, node_list,CONFIG_MAX_I2C_NUM);- for (i = 0; i< count; i++) {
struct s3c24x0_i2c_bus *bus;int node = node_list[i];if (node< 0)continue;bus =&i2c_bus[i];
^ space please
bus->regs = (struct s3c24x0_i2c *)fdtdec_get_addr(blob, node, "reg");bus->id = (enum periph_id)fdtdec_get_int(blob, node, "samsung,periph-id", -1);bus->node = node;bus->bus_num = i2c_busses++;exynos_pinmux_config(bus->id, 0);- }
+}
+static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +{
- if (bus_idx< i2c_busses)
^ space please
return&i2c_bus[bus_idx];
^ space please
- debug("Undefined bus: %d\n", bus_idx);
- return NULL;
+}
+int i2c_get_bus_num_fdt(const void *blob, int node) +{
- enum fdt_compat_id compat;
- int i;
- compat = fdtdec_lookup(blob, node);
- if (compat != COMPAT_SAMSUNG_S3C2440_I2C) {
debug("%s: Not a supported I2C node\n", __func__);return -1;- }
- for (i = 0; i< i2c_busses; i++) {
if (node == i2c_bus[i].node)return i;- }
- debug("%s: Can't find any matched I2C bus\n", __func__);
- return -1;
+}
+int i2c_reset_port_fdt(const void *blob, int node) +{
- struct s3c24x0_i2c_bus *i2c;
- int bus;
- bus = i2c_get_bus_num_fdt(blob, node);
- if (bus< 0) {
^ space
debug("could not get bus for node %d\n", node);return -1;- }
- i2c = get_bus(bus);
- if (!i2c) {
debug("get_bus() failed for node node %d\n", node);return -1;- }
- i2c_ch_init(i2c->regs, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
- return 0;
+} +#endif
- #endif /* CONFIG_HARD_I2C */
diff --git a/drivers/i2c/s3c24x0_i2c.h b/drivers/i2c/s3c24x0_i2c.h index 2dd4b06..1243bf1 100644 --- a/drivers/i2c/s3c24x0_i2c.h +++ b/drivers/i2c/s3c24x0_i2c.h @@ -30,4 +30,12 @@ struct s3c24x0_i2c { u32 iicds; u32 iiclc; };
+struct s3c24x0_i2c_bus {
- int node; /* device tree node */
- int bus_num; /* i2c bus number */
- struct s3c24x0_i2c *regs;
- enum periph_id id;
+};
- #endif /* _S3C24X0_I2C_H */
diff --git a/include/i2c.h b/include/i2c.h index 16f099d..efb097f 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -262,4 +262,30 @@ extern int get_multi_scl_pin(void); extern int get_multi_sda_pin(void); extern int multi_i2c_init(void); #endif
+/**
- Get FDT values for i2c bus.
- @param blob Device tree blbo
^ blob
- @return the number of I2C bus
- */
+void board_i2c_init(const void *blob);
+/**
- Find the I2C bus number by given a FDT I2C node.
- @param blob Device tree blbo
^ blob
- @param node FDT I2C node to find
- @return the number of I2C bus (zero based), or -1 on error
- */
+int i2c_get_bus_num_fdt(const void *blob, int node);
+/**
- Reset the I2C bus represented by the given a FDT I2C node.
- @param blob Device tree blbo
- @param node FDT I2C node to find
- @return 0 if port was reset, -1 if not found
- */
+int i2c_reset_port_fdt(const void *blob, int node); #endif /* _I2C_H_ */
Thanks!
Reviewed-by: Heiko Schocher hs@denx.de
bye, Heiko