[PATCH] gpio: pca953x: add bus option to select the i2c bus.

[Joseph Liu]

From: Joseph Liu <kw...@nuvoton.com>

If DM_I2C is used, the command "i2c dev" will not reassign
gd->cur_i2c_bus.

Add this bus option to change the active I2C bus.

Signed-off-by: Joseph Liu <kw...@nuvoton.com>
---
 drivers/gpio/pca953x.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 4ab8cee2d1..b64f6ddcea 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -20,6 +20,7 @@
 
 enum {
        PCA953X_CMD_INFO,
+       PCA953X_CMD_BUS,
        PCA953X_CMD_DEVICE,
        PCA953X_CMD_OUTPUT,
        PCA953X_CMD_INPUT,
@@ -194,6 +195,7 @@ static int pca953x_info(uint8_t chip)
 }
 
 static struct cmd_tbl cmd_pca953x[] = {
+       U_BOOT_CMD_MKENT(bus, 3, 0, (void *)PCA953X_CMD_BUS, "", ""),
        U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
        U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
        U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
@@ -205,6 +207,7 @@ static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int 
argc,
                      char *const argv[])
 {
        static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
+       uint8_t bus = 0;
        int ret = CMD_RET_USAGE, val;
        ulong ul_arg2 = 0;
        ulong ul_arg3 = 0;
@@ -214,7 +217,7 @@ static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int 
argc,
 
        /* All commands but "device" require 'maxargs' arguments */
        if (!c || !((argc == (c->maxargs)) ||
-               (((long)c->cmd == PCA953X_CMD_DEVICE) &&
+               ((((long)c->cmd == PCA953X_CMD_DEVICE) || ((long)c->cmd == 
PCA953X_CMD_BUS)) &&
                 (argc == (c->maxargs - 1))))) {
                return CMD_RET_USAGE;
        }
@@ -233,7 +236,14 @@ static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int 
argc,
                if (ret)
                        ret = CMD_RET_FAILURE;
                break;
+       case PCA953X_CMD_BUS:
+               if (argc == 3)
+                       i2c_set_bus_num((uint8_t)ul_arg2);
 
+               bus = i2c_get_bus_num();
+               printf("Current i2c bus: 0x%x\n", bus);
+               ret = CMD_RET_SUCCESS;
+               break;
        case PCA953X_CMD_DEVICE:
                if (argc == 3)
                        chip = (uint8_t)ul_arg2;
@@ -280,6 +290,8 @@ static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int 
argc,
 U_BOOT_CMD(
        pca953x,        5,      1,      do_pca953x,
        "pca953x gpio access",
+       "bus [num]\n"
+       "       - show or set current i2c bus\n"
        "device [dev]\n"
        "       - show or set current device address\n"
        "pca953x info\n"
-- 
2.17.1