[PATCH 1/4] drivers: bus: Sort Kconfig entries alphabetically

[PATCH 1/4] drivers: bus: Sort Kconfig entries alphabetically

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Kconfig | 44 ++++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e..6269608 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -4,6 +4,21 @@
 
 menu "Bus devices"
 
+config ARM_CCI
+	bool "ARM CCI driver support"
+	depends on ARM && OF && CPU_V7
+	help
+	  Driver supporting the CCI cache coherent interconnect for ARM
+	  platforms.
+
+config ARM_CCN
+	bool "ARM CCN driver support"
+	depends on ARM || ARM64
+	depends on PERF_EVENTS
+	help
+	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
+	  interconnect.
+
 config BRCMSTB_GISB_ARB
 	bool "Broadcom STB GISB bus arbiter"
 	depends on ARM || MIPS
@@ -27,15 +42,6 @@ config MVEBU_MBUS
 	  Driver needed for the MBus configuration on Marvell EBU SoCs
 	  (Kirkwood, Dove, Orion5x, MV78XX0 and Armada 370/XP).
 
-config OMAP_OCP2SCP
-	tristate "OMAP OCP2SCP DRIVER"
-	depends on ARCH_OMAP2PLUS
-	help
-	  Driver to enable ocp2scp module which transforms ocp interface
-	  protocol to scp protocol. In OMAP4, USB PHY is connected via
-	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
-	  OCP2SCP.
-
 config OMAP_INTERCONNECT
 	tristate "OMAP INTERCONNECT DRIVER"
 	depends on ARCH_OMAP2PLUS
@@ -43,20 +49,14 @@ config OMAP_INTERCONNECT
 	help
 	  Driver to enable OMAP interconnect error handling driver.
 
-config ARM_CCI
-	bool "ARM CCI driver support"
-	depends on ARM && OF && CPU_V7
-	help
-	  Driver supporting the CCI cache coherent interconnect for ARM
-	  platforms.
-
-config ARM_CCN
-	bool "ARM CCN driver support"
-	depends on ARM || ARM64
-	depends on PERF_EVENTS
+config OMAP_OCP2SCP
+	tristate "OMAP OCP2SCP DRIVER"
+	depends on ARCH_OMAP2PLUS
 	help
-	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
-	  interconnect.
+	  Driver to enable ocp2scp module which transforms ocp interface
+	  protocol to scp protocol. In OMAP4, USB PHY is connected via
+	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
+	  OCP2SCP.
 
 config VEXPRESS_CONFIG
 	bool "Versatile Express configuration bus"
-- 
2.1.4

[PATCH 1/4] drivers: bus: Sort Kconfig entries alphabetically

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Kconfig | 44 ++++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e..6269608 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -4,6 +4,21 @@
 
 menu "Bus devices"
 
+config ARM_CCI
+	bool "ARM CCI driver support"
+	depends on ARM && OF && CPU_V7
+	help
+	  Driver supporting the CCI cache coherent interconnect for ARM
+	  platforms.
+
+config ARM_CCN
+	bool "ARM CCN driver support"
+	depends on ARM || ARM64
+	depends on PERF_EVENTS
+	help
+	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
+	  interconnect.
+
 config BRCMSTB_GISB_ARB
 	bool "Broadcom STB GISB bus arbiter"
 	depends on ARM || MIPS
@@ -27,15 +42,6 @@ config MVEBU_MBUS
 	  Driver needed for the MBus configuration on Marvell EBU SoCs
 	  (Kirkwood, Dove, Orion5x, MV78XX0 and Armada 370/XP).
 
-config OMAP_OCP2SCP
-	tristate "OMAP OCP2SCP DRIVER"
-	depends on ARCH_OMAP2PLUS
-	help
-	  Driver to enable ocp2scp module which transforms ocp interface
-	  protocol to scp protocol. In OMAP4, USB PHY is connected via
-	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
-	  OCP2SCP.
-
 config OMAP_INTERCONNECT
 	tristate "OMAP INTERCONNECT DRIVER"
 	depends on ARCH_OMAP2PLUS
@@ -43,20 +49,14 @@ config OMAP_INTERCONNECT
 	help
 	  Driver to enable OMAP interconnect error handling driver.
 
-config ARM_CCI
-	bool "ARM CCI driver support"
-	depends on ARM && OF && CPU_V7
-	help
-	  Driver supporting the CCI cache coherent interconnect for ARM
-	  platforms.
-
-config ARM_CCN
-	bool "ARM CCN driver support"
-	depends on ARM || ARM64
-	depends on PERF_EVENTS
+config OMAP_OCP2SCP
+	tristate "OMAP OCP2SCP DRIVER"
+	depends on ARCH_OMAP2PLUS
 	help
-	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
-	  interconnect.
+	  Driver to enable ocp2scp module which transforms ocp interface
+	  protocol to scp protocol. In OMAP4, USB PHY is connected via
+	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
+	  OCP2SCP.
 
 config VEXPRESS_CONFIG
 	bool "Versatile Express configuration bus"
-- 
2.1.4

[PATCH 2/4] drivers: bus: Sort Makefile entries alphabetically

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Makefile | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 2973c18..3cfaf2c 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -2,16 +2,16 @@
 # Makefile for the bus drivers.
 #
 
+# Interconnect bus drivers for ARM platforms
+obj-$(CONFIG_ARM_CCI)		+= arm-cci.o
+obj-$(CONFIG_ARM_CCN)		+= arm-ccn.o
+
 obj-$(CONFIG_BRCMSTB_GISB_ARB)	+= brcmstb_gisb.o
-obj-$(CONFIG_IMX_WEIM)	+= imx-weim.o
-obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o
-obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
+obj-$(CONFIG_IMX_WEIM)		+= imx-weim.o
+obj-$(CONFIG_MVEBU_MBUS) 	+= mvebu-mbus.o
 
 # Interconnect bus driver for OMAP SoCs.
 obj-$(CONFIG_OMAP_INTERCONNECT)	+= omap_l3_smx.o omap_l3_noc.o
 
-# Interconnect bus drivers for ARM platforms
-obj-$(CONFIG_ARM_CCI)		+= arm-cci.o
-obj-$(CONFIG_ARM_CCN)		+= arm-ccn.o
-
+obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
 obj-$(CONFIG_VEXPRESS_CONFIG)	+= vexpress-config.o
-- 
2.1.4

[PATCH 2/4] drivers: bus: Sort Makefile entries alphabetically

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Makefile | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 2973c18..3cfaf2c 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -2,16 +2,16 @@
 # Makefile for the bus drivers.
 #
 
+# Interconnect bus drivers for ARM platforms
+obj-$(CONFIG_ARM_CCI)		+= arm-cci.o
+obj-$(CONFIG_ARM_CCN)		+= arm-ccn.o
+
 obj-$(CONFIG_BRCMSTB_GISB_ARB)	+= brcmstb_gisb.o
-obj-$(CONFIG_IMX_WEIM)	+= imx-weim.o
-obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o
-obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
+obj-$(CONFIG_IMX_WEIM)		+= imx-weim.o
+obj-$(CONFIG_MVEBU_MBUS) 	+= mvebu-mbus.o
 
 # Interconnect bus driver for OMAP SoCs.
 obj-$(CONFIG_OMAP_INTERCONNECT)	+= omap_l3_smx.o omap_l3_noc.o
 
-# Interconnect bus drivers for ARM platforms
-obj-$(CONFIG_ARM_CCI)		+= arm-cci.o
-obj-$(CONFIG_ARM_CCN)		+= arm-ccn.o
-
+obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
 obj-$(CONFIG_VEXPRESS_CONFIG)	+= vexpress-config.o
-- 
2.1.4

[GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Simon Horman]

Hi Olof, Hi Kevin, Hi Arnd,

Please consider these Renesas ARM based SoC drivers updates for v3.20.


The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:

  Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

for you to fetch changes up to ab9ff6fe6fdd225a92ae740eceb05e12daf00ce1:

  drivers: bus: Add Simple Power-Managed Bus Driver (2015-01-14 09:38:24 +0900)

----------------------------------------------------------------
Renesas ARM Based SoC Drivers Updates for v3.20

* Add Simple Power-Managed Bus

----------------------------------------------------------------
Geert Uytterhoeven (4):
      drivers: bus: Sort Kconfig entries alphabetically
      drivers: bus: Sort Makefile entries alphabetically
      drivers: bus: Add Simple Power-Managed Bus DT Bindings
      drivers: bus: Add Simple Power-Managed Bus Driver

 .../devicetree/bindings/bus/simple-pm-bus.txt      | 52 +++++++++++++++++++++
 drivers/bus/Kconfig                                | 53 ++++++++++++++--------
 drivers/bus/Makefile                               | 15 +++---
 drivers/bus/simple-pm-bus.c                        | 51 +++++++++++++++++++++
 4 files changed, 144 insertions(+), 27 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/bus/simple-pm-bus.txt
 create mode 100644 drivers/bus/simple-pm-bus.c

[PATCH 3/4] drivers: bus: Add Simple Power-Managed Bus DT Bindings

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 .../devicetree/bindings/bus/simple-pm-bus.txt      | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/simple-pm-bus.txt

diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.txt b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
new file mode 100644
index 0000000..d03abf7
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
@@ -0,0 +1,52 @@
+Simple Power-Managed Bus
+============
+
+A Simple Power-Managed Bus is a transparent bus that doesn't need a real
+driver, as it's typically initialized by the boot loader.
+
+However, its bus controller is part of a PM domain, or under the control of a
+functional clock.  Hence, the bus controller's PM domain and/or clock must be
+enabled for child devices connected to the bus (either on-SoC or externally)
+to function.
+
+
+Generic compatible values and properties
+----------------------------------------
+
+Required properties:
+  - compatible: Must be at least one of the vendor-specific compatible values
+		from a vendor-specific section below, and "simple-bus" as a
+		fallback.
+  - #address-cells, #size-cells, ranges: Must describe the mapping between
+		parent address and child address spaces.
+
+Optional platform-specific properties for clock or PM domain control (at least
+one of them is required):
+  - clocks: Must contain a reference to the functional clock(s),
+  - power-domains: Must contain a reference to the PM domain.
+
+
+Vendor-specific compatible values and properties
+------------------------------------------------
+
+Renesas Bus State Controller (BSC):
+  - compatible: Must be an SoC-specific value, and "renesas,bsc" as a fallback.
+                SoC-specific values can be:
+		"renesas,bsc-r8a73a4" for R-Mobile APE6 (r8a73a4)
+		"renesas,bsc-sh73a0" for SH-Mobile AG5 (sh73a0)
+  - reg: Must contain the base address and length to access the bus controller.
+  - interrupts: Must contain a reference to the BSC interrupt, if available.
+
+
+Example:
+
+	bsc: bus@fec10000 {
+		compatible = "renesas,bsc-sh73a0", "renesas,bsc", "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0x20000000>;
+		reg = <0xfec10000 0x400>;
+		interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&zb_clk>;
+		power-domains = <&pd_a4s>;
+	};
-- 
2.1.4

[GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Simon Horman]

Hi Olof, Hi Kevin, Hi Arnd,

Please consider these Renesas ARM based SoC drivers updates for v3.20.


The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:

  Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

for you to fetch changes up to ab9ff6fe6fdd225a92ae740eceb05e12daf00ce1:

  drivers: bus: Add Simple Power-Managed Bus Driver (2015-01-14 09:38:24 +0900)

----------------------------------------------------------------
Renesas ARM Based SoC Drivers Updates for v3.20

* Add Simple Power-Managed Bus

----------------------------------------------------------------
Geert Uytterhoeven (4):
      drivers: bus: Sort Kconfig entries alphabetically
      drivers: bus: Sort Makefile entries alphabetically
      drivers: bus: Add Simple Power-Managed Bus DT Bindings
      drivers: bus: Add Simple Power-Managed Bus Driver

 .../devicetree/bindings/bus/simple-pm-bus.txt      | 52 +++++++++++++++++++++
 drivers/bus/Kconfig                                | 53 ++++++++++++++--------
 drivers/bus/Makefile                               | 15 +++---
 drivers/bus/simple-pm-bus.c                        | 51 +++++++++++++++++++++
 4 files changed, 144 insertions(+), 27 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/bus/simple-pm-bus.txt
 create mode 100644 drivers/bus/simple-pm-bus.c

[PATCH 3/4] drivers: bus: Add Simple Power-Managed Bus DT Bindings

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 .../devicetree/bindings/bus/simple-pm-bus.txt      | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/simple-pm-bus.txt

diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.txt b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
new file mode 100644
index 0000000..d03abf7
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
@@ -0,0 +1,52 @@
+Simple Power-Managed Bus
+========================
+
+A Simple Power-Managed Bus is a transparent bus that doesn't need a real
+driver, as it's typically initialized by the boot loader.
+
+However, its bus controller is part of a PM domain, or under the control of a
+functional clock.  Hence, the bus controller's PM domain and/or clock must be
+enabled for child devices connected to the bus (either on-SoC or externally)
+to function.
+
+
+Generic compatible values and properties
+----------------------------------------
+
+Required properties:
+  - compatible: Must be at least one of the vendor-specific compatible values
+		from a vendor-specific section below, and "simple-bus" as a
+		fallback.
+  - #address-cells, #size-cells, ranges: Must describe the mapping between
+		parent address and child address spaces.
+
+Optional platform-specific properties for clock or PM domain control (at least
+one of them is required):
+  - clocks: Must contain a reference to the functional clock(s),
+  - power-domains: Must contain a reference to the PM domain.
+
+
+Vendor-specific compatible values and properties
+------------------------------------------------
+
+Renesas Bus State Controller (BSC):
+  - compatible: Must be an SoC-specific value, and "renesas,bsc" as a fallback.
+                SoC-specific values can be:
+		"renesas,bsc-r8a73a4" for R-Mobile APE6 (r8a73a4)
+		"renesas,bsc-sh73a0" for SH-Mobile AG5 (sh73a0)
+  - reg: Must contain the base address and length to access the bus controller.
+  - interrupts: Must contain a reference to the BSC interrupt, if available.
+
+
+Example:
+
+	bsc: bus at fec10000 {
+		compatible = "renesas,bsc-sh73a0", "renesas,bsc", "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0x20000000>;
+		reg = <0xfec10000 0x400>;
+		interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&zb_clk>;
+		power-domains = <&pd_a4s>;
+	};
-- 
2.1.4

[PATCH 4/4] drivers: bus: Add Simple Power-Managed Bus Driver

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Add a driver for transparent busses that don't need a real driver (think
"simple-bus"), where the bus controller is part of a PM domain, or under
the control of a functional clock.  Typically, the bus controller's
PM domain and/or clock must be enabled for child devices connected to
the bus (either on-SoC or externally) to function.

Hence the sole purpose of this driver is to enable its clock and PM
domain (if exist(s)), which are specified in the DT and managed from
platform and PM domain code.

Due to the child-parent relationship with devices connected to the bus,
PM domain and clock state transitions are handled in the correct order.

Currently this driver handles the Renesas Bus State Controller (BSC,
sometimes called "LBSC within Bus Bridge", or "External Bus Interface")
found on several Renesas ARM SoCs. Support for other bus controllers can
easily be added by adding more compatible values.

Note that this driver cannot just bind against "simple-bus", as that
may prevent a device-specific driver from taking precedence.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Kconfig         | 13 ++++++++++++
 drivers/bus/Makefile        |  1 +
 drivers/bus/simple-pm-bus.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 drivers/bus/simple-pm-bus.c

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 6269608..1addb70 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -58,6 +58,19 @@ config OMAP_OCP2SCP
 	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
 	  OCP2SCP.
 
+config SIMPLE_PM_BUS
+	bool "Simple Power-Managed Bus Driver"
+	depends on OF && PM
+	depends on ARCH_SHMOBILE || COMPILE_TEST
+	help
+	  Driver for transparent busses that don't need a real driver (think
+	  "simple-bus"), where the bus controller is part of a PM domain, or
+	  under the control of a functional clock, and thus relies on runtime
+	  PM for managing this PM domain and/or clock.
+	  An example of such a bus controller is the Renesas Bus State
+	  Controller (BSC, sometimes called "LBSC within Bus Bridge", or
+	  "External Bus Interface") as found on several Renesas ARM SoCs.
+
 config VEXPRESS_CONFIG
 	bool "Versatile Express configuration bus"
 	default y if ARCH_VEXPRESS
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 3cfaf2c..e023a2b 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -14,4 +14,5 @@ obj-$(CONFIG_MVEBU_MBUS) 	+= mvebu-mbus.o
 obj-$(CONFIG_OMAP_INTERCONNECT)	+= omap_l3_smx.o omap_l3_noc.o
 
 obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
+obj-$(CONFIG_SIMPLE_PM_BUS)	+= simple-pm-bus.o
 obj-$(CONFIG_VEXPRESS_CONFIG)	+= vexpress-config.o
diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
new file mode 100644
index 0000000..e55872d
--- /dev/null
+++ b/drivers/bus/simple-pm-bus.c
@@ -0,0 +1,51 @@
+/*
+ * Simple Power-Managed Bus Driver
+ *
+ * Copyright (C) 2014 Glider bvba
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+
+static int simple_pm_bus_probe(struct platform_device *pdev)
+{
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	pm_runtime_enable(&pdev->dev);
+	return 0;
+}
+
+static int simple_pm_bus_remove(struct platform_device *pdev)
+{
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+static const struct of_device_id simple_pm_bus_of_match[] = {
+	{ .compatible = "renesas,bsc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match);
+
+static struct platform_driver simple_pm_bus_driver = {
+	.probe = simple_pm_bus_probe,
+	.remove = simple_pm_bus_remove,
+	.driver = {
+		.name = "simple-pm-bus",
+		.of_match_table = simple_pm_bus_of_match,
+	},
+};
+
+module_platform_driver(simple_pm_bus_driver);
+
+MODULE_DESCRIPTION("Simple Power-Managed Bus Driver");
+MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
+MODULE_LICENSE("GPL v2");
-- 
2.1.4

[PATCH 4/4] drivers: bus: Add Simple Power-Managed Bus Driver

[Simon Horman]

From: Geert Uytterhoeven <geert+renesas@glider.be>

Add a driver for transparent busses that don't need a real driver (think
"simple-bus"), where the bus controller is part of a PM domain, or under
the control of a functional clock.  Typically, the bus controller's
PM domain and/or clock must be enabled for child devices connected to
the bus (either on-SoC or externally) to function.

Hence the sole purpose of this driver is to enable its clock and PM
domain (if exist(s)), which are specified in the DT and managed from
platform and PM domain code.

Due to the child-parent relationship with devices connected to the bus,
PM domain and clock state transitions are handled in the correct order.

Currently this driver handles the Renesas Bus State Controller (BSC,
sometimes called "LBSC within Bus Bridge", or "External Bus Interface")
found on several Renesas ARM SoCs. Support for other bus controllers can
easily be added by adding more compatible values.

Note that this driver cannot just bind against "simple-bus", as that
may prevent a device-specific driver from taking precedence.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/bus/Kconfig         | 13 ++++++++++++
 drivers/bus/Makefile        |  1 +
 drivers/bus/simple-pm-bus.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 drivers/bus/simple-pm-bus.c

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 6269608..1addb70 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -58,6 +58,19 @@ config OMAP_OCP2SCP
 	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
 	  OCP2SCP.
 
+config SIMPLE_PM_BUS
+	bool "Simple Power-Managed Bus Driver"
+	depends on OF && PM
+	depends on ARCH_SHMOBILE || COMPILE_TEST
+	help
+	  Driver for transparent busses that don't need a real driver (think
+	  "simple-bus"), where the bus controller is part of a PM domain, or
+	  under the control of a functional clock, and thus relies on runtime
+	  PM for managing this PM domain and/or clock.
+	  An example of such a bus controller is the Renesas Bus State
+	  Controller (BSC, sometimes called "LBSC within Bus Bridge", or
+	  "External Bus Interface") as found on several Renesas ARM SoCs.
+
 config VEXPRESS_CONFIG
 	bool "Versatile Express configuration bus"
 	default y if ARCH_VEXPRESS
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 3cfaf2c..e023a2b 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -14,4 +14,5 @@ obj-$(CONFIG_MVEBU_MBUS) 	+= mvebu-mbus.o
 obj-$(CONFIG_OMAP_INTERCONNECT)	+= omap_l3_smx.o omap_l3_noc.o
 
 obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
+obj-$(CONFIG_SIMPLE_PM_BUS)	+= simple-pm-bus.o
 obj-$(CONFIG_VEXPRESS_CONFIG)	+= vexpress-config.o
diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
new file mode 100644
index 0000000..e55872d
--- /dev/null
+++ b/drivers/bus/simple-pm-bus.c
@@ -0,0 +1,51 @@
+/*
+ * Simple Power-Managed Bus Driver
+ *
+ * Copyright (C) 2014 Glider bvba
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+
+static int simple_pm_bus_probe(struct platform_device *pdev)
+{
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	pm_runtime_enable(&pdev->dev);
+	return 0;
+}
+
+static int simple_pm_bus_remove(struct platform_device *pdev)
+{
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+static const struct of_device_id simple_pm_bus_of_match[] = {
+	{ .compatible = "renesas,bsc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match);
+
+static struct platform_driver simple_pm_bus_driver = {
+	.probe = simple_pm_bus_probe,
+	.remove = simple_pm_bus_remove,
+	.driver = {
+		.name = "simple-pm-bus",
+		.of_match_table = simple_pm_bus_of_match,
+	},
+};
+
+module_platform_driver(simple_pm_bus_driver);
+
+MODULE_DESCRIPTION("Simple Power-Managed Bus Driver");
+MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
+MODULE_LICENSE("GPL v2");
-- 
2.1.4

Re: [GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Olof Johansson]

On Fri, Jan 16, 2015 at 11:35:06AM +0900, Simon Horman wrote:
> Hi Olof, Hi Kevin, Hi Arnd,
> 
> Please consider these Renesas ARM based SoC drivers updates for v3.20.
> 
> 
> The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:
> 
>   Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

Simon,

Your emails are somewhat confusing, in that you have to: a handful of people
individually, but not arm@kernel.org. It's clearer that you want us to merge
this pull request if you do to: arm@kernel.org and keep the FYI recipients on
cc.


Now, about this branch: There's not a single review by anyone on the
drivers/bus pieces, nor on the binding. Please collect some, especially since
simple-bus is used by so many.


-Olof

[GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Olof Johansson]

On Fri, Jan 16, 2015 at 11:35:06AM +0900, Simon Horman wrote:
> Hi Olof, Hi Kevin, Hi Arnd,
> 
> Please consider these Renesas ARM based SoC drivers updates for v3.20.
> 
> 
> The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:
> 
>   Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

Simon,

Your emails are somewhat confusing, in that you have to: a handful of people
individually, but not arm at kernel.org. It's clearer that you want us to merge
this pull request if you do to: arm at kernel.org and keep the FYI recipients on
cc.


Now, about this branch: There's not a single review by anyone on the
drivers/bus pieces, nor on the binding. Please collect some, especially since
simple-bus is used by so many.


-Olof

Re: [GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Geert Uytterhoeven]

Hi Olof,

On Wed, Jan 21, 2015 at 11:44 PM, Olof Johansson <olof@lixom.net> wrote:
> On Fri, Jan 16, 2015 at 11:35:06AM +0900, Simon Horman wrote:
>> Please consider these Renesas ARM based SoC drivers updates for v3.20.
>>
>> The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:
>>
>>   Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)
>>
>> are available in the git repository at:
>>
>>   git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

> Now, about this branch: There's not a single review by anyone on the
> drivers/bus pieces, nor on the binding. Please collect some, especially since
> simple-bus is used by so many.

I did receive review comments on v1, which I implemented in v2.
Simon applied v3.

Please note that this is not a driver for the common "simple-bus", but an
extension for buses that rely on clocks and/or PM domains.
The "simple-bus" base bindings were taken from ePAPR.

Anyway, I'm collecting some Ack's...

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[GIT PULL] Renesas ARM Based SoC Drivers Updates for v3.20

[Geert Uytterhoeven]

Hi Olof,

On Wed, Jan 21, 2015 at 11:44 PM, Olof Johansson <olof@lixom.net> wrote:
> On Fri, Jan 16, 2015 at 11:35:06AM +0900, Simon Horman wrote:
>> Please consider these Renesas ARM based SoC drivers updates for v3.20.
>>
>> The following changes since commit 97bf6af1f928216fd6c5a66e8a57bfa95a659672:
>>
>>   Linux 3.19-rc1 (2014-12-20 17:08:50 -0800)
>>
>> are available in the git repository at:
>>
>>   git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git tags/renesas-drivers-for-v3.20

> Now, about this branch: There's not a single review by anyone on the
> drivers/bus pieces, nor on the binding. Please collect some, especially since
> simple-bus is used by so many.

I did receive review comments on v1, which I implemented in v2.
Simon applied v3.

Please note that this is not a driver for the common "simple-bus", but an
extension for buses that rely on clocks and/or PM domains.
The "simple-bus" base bindings were taken from ePAPR.

Anyway, I'm collecting some Ack's...

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds