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From: Sagar Dharia <sdharia@codeaurora.org>
To: gregkh@linuxfoundation.org, bp@suse.de, poeschel@lemonage.de,
	sdharia@codeaurora.org, treding@nvidia.com, broonie@kernel.org,
	gong.chen@linux.intel.com, andreas.noever@gmail.com,
	alan@linux.intel.com, mathieu.poirier@linaro.org,
	daniel@ffwll.ch, jkosina@suse.cz, sharon.dvir1@mail.huji.ac.il,
	joe@perches.com, davem@davemloft.net, james.hogan@imgtec.com,
	michael.opdenacker@free-electrons.com,
	daniel.thompson@linaro.org, robh+dt@kernel.org,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: kheitke@audience.com, mlocke@codeaurora.org,
	agross@codeaurora.org, sheetal.tigadoli@gmail.com,
	linux-arm-msm@vger.kernel.org
Subject: [PATCH V5 2/6] of/slimbus: OF helper for SLIMbus
Date: Wed, 27 Apr 2016 17:58:05 -0600	[thread overview]
Message-ID: <1461801489-16254-3-git-send-email-sdharia@codeaurora.org> (raw)
In-Reply-To: <1461801489-16254-1-git-send-email-sdharia@codeaurora.org>

OF helper routine scans the SLIMbus DeviceTree, allocates resources,
and creates slim_devices according to the hierarchy.

Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
---
 Documentation/devicetree/bindings/slimbus/bus.txt | 55 ++++++++++++++++++++++
 drivers/slimbus/slim-core.c                       | 57 +++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/slimbus/bus.txt

diff --git a/Documentation/devicetree/bindings/slimbus/bus.txt b/Documentation/devicetree/bindings/slimbus/bus.txt
new file mode 100644
index 0000000..c5bb54a
--- /dev/null
+++ b/Documentation/devicetree/bindings/slimbus/bus.txt
@@ -0,0 +1,55 @@
+SLIM(Serial Low Power Interchip Media Bus) bus
+
+SLIMbus is a 2-wire bus, and is used to communicate with peripheral
+components like audio-codec.
+
+Controller is a normal device using binding for whatever bus it is
+on (e.g. platform bus).
+Required property for SLIMbus controller node:
+- compatible	- name of SLIMbus controller following generic names
+		recommended practice.
+- #address-cells - should be 4 (number of cells required to define
+		4 fields of the enumeration address for the SLIMbus
+		slave device)
+- #size-cells	- should be 0
+
+No other properties are required in the SLIMbus controller bus node.
+
+Child nodes:
+Every SLIMbus controller node can contain zero or more child nodes
+representing slave devices on the bus. Every SLIMbus slave device is
+uniquely determined by the enumeration address containing 4 fields:
+Manufacturer ID, Product code, Device index, and Instance value for
+the device.
+If child node is not present and it is instantiated after device
+discovery (slave device reporting itself present),
+its name will be in this format: "217:60:1:0"
+
+However, the device may need additional non-standard way to power it
+up so that it can start functioning. In that case, child node will
+need to be present as slave of the slimbus-controller device.
+The compatible property will be necessary so that corresponding
+driver can probe and execute the required procedure to make it
+functional.
+
+Required property for SLIMbus child node if it is present:
+- reg		- enumeration address fields of the device
+
+- compatible	- name of SLIMbus child node using practice typically
+		followed by discoverable buses:
+		"<manufacturer>,<product-model>", "slim"
+
+SLIMbus example for Qualcomm's slimbus manager component:
+
+	slim@28080000 {
+		compatible = "qcom,slim-msm";
+		reg = <0x28080000 0x2000>,
+		interrupts = <0 33 0>;
+		clocks = <&lcc SLIMBUS_SRC>, <&lcc AUDIO_SLIMBUS_CLK>;
+		clock-names = "iface_clk", "core_clk";
+
+		codec@0217.0060.01.00 {
+			compatible = "qcom,wcdv1", "slim";
+			reg = <0x217 0x60 0x1 0x0>;
+		};
+	};
diff --git a/drivers/slimbus/slim-core.c b/drivers/slimbus/slim-core.c
index 6024f74..6aaa08f 100644
--- a/drivers/slimbus/slim-core.c
+++ b/drivers/slimbus/slim-core.c
@@ -18,6 +18,7 @@
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>
 #include <linux/slimbus.h>
+#include <linux/of.h>
 
 static DEFINE_MUTEX(slim_lock);
 static DEFINE_IDR(ctrl_idr);
@@ -265,6 +266,61 @@ static LIST_HEAD(board_list);
 static LIST_HEAD(slim_ctrl_list);
 static DEFINE_MUTEX(board_lock);
 
+#if IS_ENABLED(CONFIG_OF)
+/* OF helpers for SLIMbus */
+static void of_register_slim_devices(struct slim_controller *ctrl)
+{
+	struct device_node *node;
+
+	if (!ctrl->dev.of_node)
+		return;
+
+	for_each_child_of_node(ctrl->dev.of_node, node) {
+		int ret;
+		u32 ea[4];
+		struct slim_device *slim;
+		char *name;
+
+		ret = of_property_read_u32_array(node, "reg", ea, 4);
+		if (ret) {
+			dev_err(&ctrl->dev, "of_slim: E-addr err:%d\n", ret);
+			continue;
+		}
+		name = kcalloc(SLIMBUS_NAME_SIZE, sizeof(char), GFP_KERNEL);
+		if (!name)
+			return;
+
+		slim = kzalloc(sizeof(struct slim_device), GFP_KERNEL);
+		if (!slim) {
+			kfree(name);
+			return;
+		}
+		slim->dev.of_node = of_node_get(node);
+
+		slim->e_addr.manf_id = (u16)ea[0];
+		slim->e_addr.prod_code = (u16)ea[1];
+		slim->e_addr.dev_index = (u8)ea[2];
+		slim->e_addr.instance = (u8)ea[3];
+
+		ret = of_modalias_node(node, name, SLIMBUS_NAME_SIZE);
+		if (ret < 0) {
+			/* use device address for name, if not specified */
+			snprintf(name, SLIMBUS_NAME_SIZE, "%x:%x:%x:%x",
+				 slim->e_addr.manf_id, slim->e_addr.prod_code,
+				 slim->e_addr.dev_index, slim->e_addr.instance);
+		}
+		slim->name = name;
+
+		ret = slim_add_device(ctrl, slim);
+		if (ret)
+			dev_err(&ctrl->dev, "of_slim device register err:%d\n",
+				ret);
+	}
+}
+#else
+static void of_register_slim_devices(struct slim_controller *ctrl) { }
+#endif
+
 /* If controller is not present, only add to boards list */
 static void slim_match_ctrl_to_boardinfo(struct slim_controller *ctrl,
 					 struct slim_boardinfo *bi)
@@ -314,6 +370,7 @@ static void slim_ctrl_add_boarddevs(struct slim_controller *ctrl)
 {
 	struct sbi_boardinfo *bi;
 
+	of_register_slim_devices(ctrl);
 	mutex_lock(&board_lock);
 	list_add_tail(&ctrl->list, &slim_ctrl_list);
 	list_for_each_entry(bi, &board_list, list)
-- 
1.8.2.1

  parent reply	other threads:[~2016-04-27 23:58 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-27 23:58 [PATCH V5 0/6] Introduce framework for SLIMbus device drivers Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 1/6] SLIMbus: Device management on SLIMbus Sagar Dharia
2016-04-28 10:00   ` Arnd Bergmann
2016-04-28 11:53     ` Mark Brown
2016-04-28 12:33       ` Arnd Bergmann
2016-04-28 14:38         ` Mark Brown
     [not found]           ` <20160428143801.GO3217-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-28 14:59             ` Arnd Bergmann
2016-04-28 14:59               ` Arnd Bergmann
2016-04-28 16:39               ` Mark Brown
2016-04-28 16:49                 ` Arnd Bergmann
2016-04-29 11:17                   ` Mark Brown
2016-04-29 11:17                     ` Mark Brown
2016-05-06 17:35                     ` Sagar Dharia
2016-06-03  9:14   ` Masami Hiramatsu
2016-04-27 23:58 ` Sagar Dharia [this message]
2016-04-28  9:54   ` [PATCH V5 2/6] of/slimbus: OF helper for SLIMbus Arnd Bergmann
2016-04-28 11:11   ` Mark Rutland
2016-05-03 16:11   ` Rob Herring
2016-05-03 19:26     ` Arnd Bergmann
2016-04-27 23:58 ` [PATCH V5 3/6] slimbus: Add messaging APIs to slimbus framework Sagar Dharia
2016-04-28  9:52   ` Arnd Bergmann
2016-04-27 23:58 ` [PATCH V5 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Sagar Dharia
     [not found]   ` <1461801489-16254-5-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-04-28 11:28     ` Mark Rutland
2016-04-28 11:28       ` Mark Rutland
2016-05-06 17:28       ` Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 6/6] slim: qcom: Add runtime-pm support using clock-pause feature Sagar Dharia
2016-06-03  9:14 ` [PATCH V5 0/6] Introduce framework for SLIMbus device drivers Masami Hiramatsu
2016-06-27  1:30   ` Masami Hiramatsu

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