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Date: Tue, 21 Feb 2012 17:43:16 -0700
From: Stephen Warren <swarren@...dia.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Linus Walleij <linus.walleij@...ricsson.com>, B29396@...escale.com,
s.hauer@...gutronix.de, dongas86@...il.com, shawn.guo@...aro.org,
thomas.abraham@...aro.org, tony@...mide.com,
linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: [PATCH V2] pinctrl: Assume map table entries can't have a NULL name field
pinctrl_register_mappings() already requires that every mapping table
entry have a non-NULL name field.
Logically, this makes sense too; drivers should always request a specific
named state so they know what they're getting. Relying on getting the
first mentioned state in the mapping table is error-prone, and a nasty
special case to implement, given that a given the mapping table may define
multiple states for a device.
Update a few places in the code and documentation that still allowed for
NULL name fields.
Signed-off-by: Stephen Warren <swarren@...dia.com>
---
This is an updated version of PATCH 8/20 of the series I posted on Sunday.
Hopefully patches 8, 9 at least can be applied now, assuming Dong is OK
with this patch after my explanation (and note that a later patch replaces
the need to pass "default" to pinctrl_get() by adding new API pinctrl_
get_select_default()).
v2: Update mach-u300/core.c and sirfsoc_uart.c not to request NULL state
names.
Documentation/pinctrl.txt | 8 ++------
arch/arm/mach-u300/core.c | 8 ++++----
drivers/pinctrl/core.c | 22 +++++++---------------
drivers/tty/serial/sirfsoc_uart.c | 2 +-
4 files changed, 14 insertions(+), 26 deletions(-)
diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
index ee3266b..bfe83b1 100644
--- a/Documentation/pinctrl.txt
+++ b/Documentation/pinctrl.txt
@@ -934,7 +934,7 @@ foo_probe()
/* Allocate a state holder named "state" etc */
struct pinctrl p;
- p = pinctrl_get(&device, NULL);
+ p = pinctrl_get(&device, "default");
if IS_ERR(p)
return PTR_ERR(p);
pinctrl_enable(p);
@@ -948,10 +948,6 @@ foo_remove()
pinctrl_put(state->p);
}
-If you want to grab a specific control mapping and not just the first one
-found for this device you can specify a specific mapping name, for example in
-the above example the second i2c0 setting: pinctrl_get(&device, "spi0-pos-B");
-
This get/enable/disable/put sequence can just as well be handled by bus drivers
if you don't want each and every driver to handle it and you know the
arrangement on your bus.
@@ -1003,7 +999,7 @@ Since it may be common to request the core to hog a few always-applicable
mux settings on the primary pin controller, there is a convenience macro for
this:
-PIN_MAP_PRIMARY_SYS_HOG("POWERMAP", "pinctrl-foo", "power_func")
+PIN_MAP_SYS_HOG("POWERMAP", "pinctrl-foo", "power_func")
This gives the exact same result as the above construction.
diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index d66bc97..aa0c46d 100644
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -1558,9 +1558,9 @@ static struct pinctrl_map __initdata u300_pinmux_map[] = {
PIN_MAP_SYS_HOG("EMIF0", "pinmux-u300", "emif0"),
PIN_MAP_SYS_HOG("EMIF1", "pinmux-u300", "emif1"),
/* per-device maps for MMC/SD, SPI and UART */
- PIN_MAP("MMCSD", "pinmux-u300", "mmc0", "mmci"),
- PIN_MAP("SPI", "pinmux-u300", "spi0", "pl022"),
- PIN_MAP("UART0", "pinmux-u300", "uart0", "uart0"),
+ PIN_MAP("default", "pinmux-u300", "mmc0", "mmci"),
+ PIN_MAP("default", "pinmux-u300", "spi0", "pl022"),
+ PIN_MAP("default", "pinmux-u300", "uart0", "uart0"),
};
struct u300_mux_hog {
@@ -1592,7 +1592,7 @@ static int __init u300_pinctrl_fetch(void)
struct pinctrl *p;
int ret;
- p = pinctrl_get(u300_mux_hogs[i].dev, NULL);
+ p = pinctrl_get(u300_mux_hogs[i].dev, "default");
if (IS_ERR(p)) {
pr_err("u300: could not get pinmux hog %s\n",
u300_mux_hogs[i].name);
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index fb3fbb7..9d421e3 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -488,8 +488,8 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
int i;
struct pinctrl_map const *map;
- /* We must have dev or ID or both */
- if (!dev && !name)
+ /* We must have a state name */
+ if (WARN_ON(!name))
return ERR_PTR(-EINVAL);
if (dev)
@@ -529,23 +529,16 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
pr_debug("in map, found pctldev %s to handle function %s",
dev_name(pctldev->dev), map->function);
- /*
- * If we're looking for a specific named map, this must match,
- * else we loop and look for the next.
- */
- if (name != NULL) {
- if (map->name == NULL)
- continue;
- if (strcmp(map->name, name))
- continue;
- }
+ /* State name must be the one we're looking for */
+ if (strcmp(map->name, name))
+ continue;
/*
* This is for the case where no device name is given, we
* already know that the function name matches from above
* code.
*/
- if (!map->dev_name && (name != NULL))
+ if (!map->dev_name)
found_map = true;
/* If the mapping has a device set up it must match */
@@ -579,8 +572,7 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
pr_debug("found %u mux maps for device %s, UD %s\n",
num_maps,
- devname ? devname : "(anonymous)",
- name ? name : "(undefined)");
+ devname ? devname : "(anonymous)", name);
/* Add the pinmux to the global list */
mutex_lock(&pinctrl_list_mutex);
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index c1a871e..51610a7 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -673,7 +673,7 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
port->irq = res->start;
if (sirfport->hw_flow_ctrl) {
- sirfport->p = pinctrl_get(&pdev->dev, NULL);
+ sirfport->p = pinctrl_get(&pdev->dev, "default");
ret = IS_ERR(sirfport->p);
if (ret)
goto pin_err;
--
1.7.0.4
--
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