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[PATCH v4 22/22] of/platform: Defer probes of registered devices

From Tomeu Vizoso <tomeu.vizoso@collabora.com>
Newsgroups linux.kernel
Subject [PATCH v4 22/22] of/platform: Defer probes of registered devices
Date 2015-09-07 14:30 +0200
Message-ID <q63ID-5sL-43@gated-at.bofh.it> (permalink)
References <q63IB-5sL-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Instead of trying to match and probe platform and AMBA devices right
after each is registered, delay their probes until device_initcall_sync.

This means that devices will start probing once all built-in drivers
have registered, and after all platform and AMBA devices from the DT
have been registered already.

This allows us to prevent deferred probes by probing dependencies on
demand.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---

Changes in v4:
- Also defer probes of AMBA devices registered from the DT as they can
  also request resources.

Changes in v3: None
Changes in v2: None

 drivers/of/platform.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index f089d95ac961..a9397ce838ea 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -164,7 +164,8 @@ static struct platform_device *of_platform_device_create_pdata(
 					struct device_node *np,
 					const char *bus_id,
 					void *platform_data,
-					struct device *parent)
+					struct device *parent,
+					bool probe_late)
 {
 	struct platform_device *dev;
 
@@ -178,6 +179,7 @@ static struct platform_device *of_platform_device_create_pdata(
 
 	dev->dev.bus = &platform_bus_type;
 	dev->dev.platform_data = platform_data;
+	dev->dev.probe_late = probe_late;
 	of_dma_configure(&dev->dev, dev->dev.of_node);
 	of_msi_configure(&dev->dev, dev->dev.of_node);
 
@@ -209,7 +211,8 @@ struct platform_device *of_platform_device_create(struct device_node *np,
 					    const char *bus_id,
 					    struct device *parent)
 {
-	return of_platform_device_create_pdata(np, bus_id, NULL, parent);
+	return of_platform_device_create_pdata(np, bus_id, NULL, parent,
+					       false);
 }
 EXPORT_SYMBOL(of_platform_device_create);
 
@@ -240,6 +243,7 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
 	dev->dev.of_node = of_node_get(node);
 	dev->dev.parent = parent ? : &platform_bus;
 	dev->dev.platform_data = platform_data;
+	dev->dev.probe_late = true;
 	if (bus_id)
 		dev_set_name(&dev->dev, "%s", bus_id);
 	else
@@ -358,7 +362,8 @@ static int of_platform_bus_create(struct device_node *bus,
 		return 0;
 	}
 
-	dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
+	dev = of_platform_device_create_pdata(bus, bus_id, platform_data,
+					      parent, true);
 	if (!dev || !of_match_node(matches, bus))
 		return 0;
 
-- 
2.4.3

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Thread

[PATCH v4 0/22] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 13/22] backlight: Probe backlight devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 05/22] gpio: Probe GPIO drivers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 03/22] of/platform: Point to struct device from device node Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 09/22] drm: Probe panels on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 20/22] driver core: Allow deferring probes until late init Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
    Re: [PATCH v4 20/22] driver core: Allow deferring probes until late  init Mark Brown <broonie@kernel.org> - 2015-09-11 14:20 +0200
      Re: [PATCH v4 20/22] driver core: Allow deferring probes until late init Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-14 11:10 +0200
  [PATCH v4 14/22] usb: phy: Probe phy devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 15/22] clk: Probe clk providers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 22/22] of/platform: Defer probes of registered devices Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 16/22] pinctrl: Probe pinctrl devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
  [PATCH v4 21/22] driver core: Start processing deferred probes earlier Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:30 +0200
    Re: [PATCH v4 21/22] driver core: Start processing deferred probes  earlier Mark Brown <broonie@kernel.org> - 2015-09-11 14:30 +0200
      Re: [PATCH v4 21/22] driver core: Start processing deferred probes earlier Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-15 15:20 +0200
  [PATCH v4 07/22] regulator: core: Reduce critical area in _regulator_get Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
    Re: [PATCH v4 07/22] regulator: core: Reduce critical area in  _regulator_get Mark Brown <broonie@kernel.org> - 2015-09-11 14:20 +0200
  [PATCH v4 11/22] i2c: core: Probe i2c adapters and devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
  [PATCH v4 12/22] pwm: Probe PWM chip devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
  [PATCH v4 02/22] ARM: amba: Move reading of periphid to pre_probe() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
  [PATCH v4 01/22] driver core: Add pre_probe callback to bus_type Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
    Re: [PATCH v4 01/22] driver core: Add pre_probe callback to bus_type Mark Brown <broonie@kernel.org> - 2015-09-11 14:10 +0200
  [PATCH v4 10/22] drm/tegra: Probe dpaux devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-07 14:40 +0200
  Re: [PATCH v4 0/22] On-demand device probing Rob Herring <robherring2@gmail.com> - 2015-09-07 23:00 +0200
    Re: [PATCH v4 0/22] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-08 09:40 +0200
      Re: [PATCH v4 0/22] On-demand device probing Rob Herring <robh@kernel.org> - 2015-09-09 07:50 +0200
        Re: [PATCH v4 0/22] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-09 11:50 +0200

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