diff options
| author | Jan Kundrát <jan.kundrat@cesnet.cz> | 2018-01-26 18:06:37 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-02-12 12:47:24 +0300 |
| commit | 1781af563aef66c2eb7cda65d754d2228321a260 (patch) | |
| tree | e5a80f9cc589b9ab0c5788b83a35f4ba1eedd7a4 /drivers/pinctrl/core.c | |
| parent | ed231751413d4f33403f0bf0d5a957b41824f940 (diff) | |
| download | linux-1781af563aef66c2eb7cda65d754d2228321a260.tar.xz | |
pinctrl: mcp23s08: spi: Fix duplicate pinctrl debugfs entries
This is a bit more involved because the pinctrl core so far always
assumed that one device (with a unique dev_name) only contains a single
pinctrl thing. This is not true for the mcp23s08 driver for chips
connected over SPI. They have a "logical address" which means that
several chips can share one physical CS signal.
A downside of this patch are some possibly ugly names for the debugfs
entries, such as "spi1.1-mcp23xxx-pinctrl.2", etc.
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/core.c')
| -rw-r--r-- | drivers/pinctrl/core.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 2c0dbfcff3e6..d2b0329bc98a 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1866,9 +1866,23 @@ static struct dentry *debugfs_root; static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) { struct dentry *device_root; + const char *debugfs_name; + + if (pctldev->desc->name && + strcmp(dev_name(pctldev->dev), pctldev->desc->name)) { + debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL, + "%s-%s", dev_name(pctldev->dev), + pctldev->desc->name); + if (!debugfs_name) { + pr_warn("failed to determine debugfs dir name for %s\n", + dev_name(pctldev->dev)); + return; + } + } else { + debugfs_name = dev_name(pctldev->dev); + } - device_root = debugfs_create_dir(dev_name(pctldev->dev), - debugfs_root); + device_root = debugfs_create_dir(debugfs_name, debugfs_root); pctldev->device_root = device_root; if (IS_ERR(device_root) || !device_root) { |