diff options
| author | Andy Park <andyp@nvidia.com> | 2013-05-06 16:11:19 -0700 |
|---|---|---|
| committer | Riham Haidar <rhaidar@nvidia.com> | 2013-05-17 16:56:04 -0700 |
| commit | 0ad0f4e4bdbaa8bf29b4ef67ccb69c86408e33bf (patch) | |
| tree | 81f963279a0158030e48554599e4b66dff103675 /arch/arm/mach-tegra/pinmux.c | |
| parent | 25993ddbaa2520f77453c01a3b94ffd22919e33d (diff) | |
ARM: tegra: change permission of pinmux debugfs
Change the permission of tegra_pinmux debug node to be able to write
to it so that the functionality of changing pinmux configuration is
useful. Also added some instruction for the usages.
Bug 1213934
Change-Id: Iada4f345d95e12ab21e175aae768c146082774b7
Signed-off-by: Andy Park <andyp@nvidia.com>
(cherry picked from commit 1491f7a3bfe4748b3cb96e3f85b2844786f8e917)
Reviewed-on: http://git-master/r/226391
Reviewed-by: Simon Je <sje@nvidia.com>
Tested-by: Simon Je <sje@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkata (Muni) Anda <vanda@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/pinmux.c')
| -rw-r--r-- | arch/arm/mach-tegra/pinmux.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/pinmux.c b/arch/arm/mach-tegra/pinmux.c index 2fd2ff2bdadd..54bad552554a 100644 --- a/arch/arm/mach-tegra/pinmux.c +++ b/arch/arm/mach-tegra/pinmux.c @@ -1203,6 +1203,13 @@ static int dbg_pinmux_open(struct inode *inode, struct file *file) return single_open(file, dbg_pinmux_show, &inode->i_private); } +/* + * Changing pinmux configuration at runtime + * + * Usage: Feed "<PINGROUP> <FUNCTION> <E_INPUT> <PUPD> <TRISTATE>" + * to tegra_pinmux + * ex) # echo "HDMI_CEC CEC OUTPUT NORMAL TRISTATE" > /d/tegra_pinmux + */ #define DELIMITER " \n" static ssize_t dbg_pinmux_write(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) @@ -1368,7 +1375,7 @@ static const struct file_operations debug_drive_fops = { static int __init tegra_pinmux_debuginit(void) { - (void) debugfs_create_file("tegra_pinmux", S_IRUGO, + (void) debugfs_create_file("tegra_pinmux", S_IRUGO | S_IWUGO, NULL, NULL, &debug_fops); (void) debugfs_create_file("tegra_pinmux_drive", S_IRUGO, NULL, NULL, &debug_drive_fops); |