arm: omap2plus: fix ads7846 pendown gpio request

introduced by: 96974a24
(omap: consolidate touch screen initialization among different boards)

ads7846 driver can use either gpio_pendown or get_pendown_state()
callback. In case of gpio_pendown, it requests the provided gpio_pendown
thus resulting in double requesting that gpio:

ads7846 spi1.0: failed to request pendown GPIO57
ads7846: probe of spi1.0 failed with error -16

Fix this by restricting the gpio request to the case of
get_pendown_state() callback is used.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Tested-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
index e94903b2c65bb0f4d0a1cc1fecb5c8512ff9bdeb..94ccf464677b78eeb831671f54f862325881a0ac 100644 (file)
--- a/arch/arm/mach-omap2/common-board-devices.c
+++ b/arch/arm/mach-omap2/common-board-devices.c
@@ -85,17 +85,17 @@ void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
        struct spi_board_info *spi_bi = &ads7846_spi_board_info;
        int err;
 
-       err = gpio_request(gpio_pendown, "TS PenDown");
-       if (err) {
-               pr_err("Could not obtain gpio for TS PenDown: %d\n", err);
-               return;
-       }
-
-       gpio_direction_input(gpio_pendown);
-       gpio_export(gpio_pendown, 0);
+       if (board_pdata && board_pdata->get_pendown_state) {
+               err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
+               if (err) {
+                       pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
+                       return;
+               }
+               gpio_export(gpio_pendown, 0);
 
-       if (gpio_debounce)
-               gpio_set_debounce(gpio_pendown, gpio_debounce);
+               if (gpio_debounce)
+                       gpio_set_debounce(gpio_pendown, gpio_debounce);
+       }
 
        ads7846_config.gpio_pendown = gpio_pendown;