[PATCH v2] pinctrl: intel: merrifield: Introduce OF device table

[Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On Intel Merrifield the pin control device is a separate IP block
without any PCI or ACPI ID assigned. We need some means to allow the
device be enumerated in ACPI environment (*).

To achieve this without allocation special ACPI ID, which is really long
and pretty much unachievable procedure, we just re-use special ACPI ID
and standard compatible string.

(*) ACPI is enabled via second bootloader, i.e. U-Boot,
    firmware is still left untouched and being SFI enabled.

Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
In v2:
- add DT binding
- we asked internally for ACPI ID about month ago with full silence in response
 .../devicetree/bindings/pinctrl/intel,FLIS-pinctrl.txt      | 13 +++++++++++++
 drivers/pinctrl/intel/pinctrl-merrifield.c                  |  7 +++++++
 2 files changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/intel,FLIS-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/intel,FLIS-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/intel,FLIS-pinctrl.txt
new file mode 100644
index 000000000000..8f5a32b2333b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/intel,FLIS-pinctrl.txt
@@ -0,0 +1,13 @@
+Intel Corporation, Family-Level Interface Shim (FLIS) pin controller
+
+FLIS pin controller is a separate IP block on non-ACPI enabled Intel
+platforms, such as Intel Merrifield. Very known board based on it is
+Intel Edison.
+
+There is an ongoing effort to emulate ACPI on that kind of boards
+and, since it is near to impossible to allocate an ACPI ID for the
+such controller, the compatible string may be used along with special
+PRP0001 ACPI ID.
+
+Required properties for FLIS pin controller:
+- compatible: "intel,merrifield-pinctrl"
diff --git a/drivers/pinctrl/intel/pinctrl-merrifield.c b/drivers/pinctrl/intel/pinctrl-merrifield.c
index 86c4b3fab7b0..46fe30702a79 100644
--- a/drivers/pinctrl/intel/pinctrl-merrifield.c
+++ b/drivers/pinctrl/intel/pinctrl-merrifield.c
@@ -931,10 +931,17 @@ static int mrfld_pinctrl_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id mrfld_of_table[] = {
+	{ .compatible = "intel,merrifield-pinctrl" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, mrfld_of_table);
+
 static struct platform_driver mrfld_pinctrl_driver = {
 	.probe = mrfld_pinctrl_probe,
 	.driver = {
 		.name = "pinctrl-merrifield",
+		.of_match_table = mrfld_of_table,
 	},
 };
 
-- 
2.14.2

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