linux-kernel - [RFC PATCH v2 1/3] add mikrobus descriptors to greybus

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Date:   Tue, 18 Aug 2020 18:18:13 +0530
From:   Vaishnav M A <vaishnav@...gleboard.org>
To:     greybus-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, arnd@...db.de, johan@...nel.org,
        elder@...nel.org
Cc:     Vaishnav M A <vaishnav@...gleboard.org>, robh@...nel.org,
        mchehab+huawei@...nel.org, davem@...emloft.net,
        jkridner@...gleboard.org, drew@...gleboard.org,
        robertcnelson@...gleboard.org, rajkovic@...roe.com,
        chrisfriedt@...il.com, zoran.stojsavljevic@...il.com
Subject: [RFC PATCH v2 1/3] add mikrobus descriptors to greybus_manifest

This patch adds new descriptors used in the manifest parsing inside
the mikrobus driver, the device descriptor help to describe the
devices on a mikroBUS port, mikrobus descriptor is used to set up
the mikrobus port pinmux and GPIO states and property descriptor
to pass named properties to device drivers through the Unified
Properties API under linux/property.h

The corresponding pull request for manifesto is updated
at : https://github.com/projectara/manifesto/pull/2

Signed-off-by: Vaishnav M A <vaishnav@...gleboard.org>
---
 include/linux/greybus/greybus_manifest.h | 47 ++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/include/linux/greybus/greybus_manifest.h b/include/linux/greybus/greybus_manifest.h
index 6e62fe478712..821661ea7f01 100644
--- a/include/linux/greybus/greybus_manifest.h
+++ b/include/linux/greybus/greybus_manifest.h
@@ -23,6 +23,9 @@ enum greybus_descriptor_type {
 	GREYBUS_TYPE_STRING		= 0x02,
 	GREYBUS_TYPE_BUNDLE		= 0x03,
 	GREYBUS_TYPE_CPORT		= 0x04,
+	GREYBUS_TYPE_MIKROBUS		= 0x05,
+	GREYBUS_TYPE_PROPERTY		= 0x06,
+	GREYBUS_TYPE_DEVICE		= 0x07,
 };
 
 enum greybus_protocol {
@@ -151,6 +154,47 @@ struct greybus_descriptor_cport {
 	__u8	protocol_id;	/* enum greybus_protocol */
 } __packed;
 
+/*
+ * A mikrobus descriptor is used to describe the details
+ * about the bus ocnfiguration for the add-on board
+ * connected to the mikrobus port.
+ */
+struct greybus_descriptor_mikrobus {
+	__u8 pin_state[12];
+} __packed;
+
+/*
+ * A property descriptor is used to pass named properties
+ * to device drivers through the unified device properties
+ * interface under linux/property.h
+ */
+struct greybus_descriptor_property {
+	__u8 length;
+	__u8 id;
+	__u8 propname_stringid;
+	__u8 type;
+	__u8 value[0];
+} __packed;
+
+/*
+ * A device descriptor is used to describe the
+ * details required by a add-on board device
+ * driver.
+ */
+struct greybus_descriptor_device {
+	__u8 id;
+	__u8 driver_stringid;
+	__u8 protocol;
+	__u8 reg;
+	__le32 max_speed_hz;
+	__u8 irq;
+	__u8 irq_type;
+	__u8 mode;
+	__u8 prop_link;
+	__u8 gpio_link;
+	__u8 pad[3];
+} __packed;
+
 struct greybus_descriptor_header {
 	__le16	size;
 	__u8	type;		/* enum greybus_descriptor_type */
@@ -164,6 +208,9 @@ struct greybus_descriptor {
 		struct greybus_descriptor_interface	interface;
 		struct greybus_descriptor_bundle	bundle;
 		struct greybus_descriptor_cport		cport;
+		struct greybus_descriptor_mikrobus	mikrobus;
+		struct greybus_descriptor_property	property;
+		struct greybus_descriptor_device	device;
 	};
 } __packed;
 
-- 
2.25.1