mfd: lpc_ich: Expose the GPIO controller cell's software node

One of the users of this driver - meraki-mx100 - abuses the software
node API by setting up a dummy software node without any logical link to
this GPIO controller and uses the fact that the GPIO core matches the
controller's label against the swnode's name to make the lookup work.

We want to remove this behavior from GPIOLIB in favor of actual matching
of firmware nodes but that would break this user. To facilitate that:
create a software node for the GPIO controller cell and expose its
address in the provided MFD header.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260218-meraki-swnodes-v2-1-92c521da241c@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
index 4b7d0cb9340f1ac51bf3845427ba1dee8cad5667..5a3d79f339dd23994aee615c2dd6ef637e3c14a4 100644 (file)
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -45,6 +45,7 @@
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/pinctrl/pinctrl.h>
+#include <linux/property.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/lpc_ich.h>
 #include <linux/platform_data/itco_wdt.h>
@@ -125,11 +126,17 @@ static struct mfd_cell lpc_ich_wdt_cell = {
        .ignore_resource_conflicts = true,
 };
 
+const struct software_node lpc_ich_gpio_swnode = {
+       .name = "gpio_ich",
+};
+EXPORT_SYMBOL_NS(lpc_ich_gpio_swnode, "LPC_ICH");
+
 static struct mfd_cell lpc_ich_gpio_cell = {
        .name = "gpio_ich",
        .num_resources = ARRAY_SIZE(gpio_ich_res),
        .resources = gpio_ich_res,
        .ignore_resource_conflicts = true,
+       .swnode = &lpc_ich_gpio_swnode,
 };
 
 #define INTEL_GPIO_RESOURCE_SIZE       0x1000

diff --git a/include/linux/mfd/lpc_ich.h b/include/linux/mfd/lpc_ich.h
index 1fbda1f8967db41ba3bacd331e5d18dfa8ebca3c..1819aa743c5c9aa1ac51710bbdbbefab50670ebe 100644 (file)
--- a/include/linux/mfd/lpc_ich.h
+++ b/include/linux/mfd/lpc_ich.h
@@ -37,4 +37,6 @@ struct lpc_ich_info {
        u8 use_gpio;
 };
 
+extern const struct software_node lpc_ich_gpio_swnode;
+
 #endif