[PATCH v2 00/13] MIPS: add support for the Microsemi MIPS SoCs

[PATCH v2 00/13] MIPS: add support for the Microsemi MIPS SoCs

[Alexandre Belloni]

Hi,

This patch series adds initial support for the Microsemi MIPS SoCs. It
is currently focusing on the Microsemi Ocelot (VSC7513, VSC7514).

It adds support for the IRQ controller, pinmux and gpio controller and
reset control.

This produces a kernel that can boot to the console.

This is a single series for reference but it can also be taken
separately by each maintainer as each drivers are independant.

Changes in v2:
 - removed the wildcard in MAINAINERS
 - corrected the Cc list
 - added proper documentation for both syscons
 - removed the mscc,cpucontrol property
 - updated the ranges property in the ocelot dtsi

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-pm@vger.kernel.org


Alexandre Belloni (13):
  dt-bindings: Add vendor prefix for Microsemi Corporation
  dt-bindings: interrupt-controller: Add binding for the Microsemi
    Ocelot interrupt controller
  irqchip: Add a driver for the Microsemi Ocelot controller
  dt-bindings: pinctrl: Add bindings for Microsemi Ocelot
  pinctrl: Add Microsemi Ocelot SoC driver
  dt-bindings: mips: Add bindings for Microsemi SoCs
  dt-bindings: power: reset: Document ocelot-reset binding
  power: reset: Add a driver for the Microsemi Ocelot reset
  MIPS: mscc: Add initial support for Microsemi MIPS SoCs
  MIPS: mscc: add ocelot dtsi
  MIPS: mscc: add ocelot PCB123 device tree
  MIPS: defconfigs: add a defconfig for Microsemi SoCs
  MAINTAINERS: Add entry for Microsemi MIPS SoCs

 .../interrupt-controller/mscc,ocelot-icpu-intr.txt |  22 +
 Documentation/devicetree/bindings/mips/mscc.txt    |  46 ++
 .../bindings/pinctrl/mscc,ocelot-pinctrl.txt       |  39 ++
 .../bindings/power/reset/ocelot-reset.txt          |  17 +
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 MAINTAINERS                                        |   7 +
 arch/mips/Kbuild.platforms                         |   1 +
 arch/mips/Kconfig                                  |  24 +
 arch/mips/boot/dts/Makefile                        |   1 +
 arch/mips/boot/dts/mscc/Makefile                   |   6 +
 arch/mips/boot/dts/mscc/ocelot.dtsi                | 115 +++++
 arch/mips/boot/dts/mscc/ocelot_pcb123.dts          |  27 ++
 arch/mips/configs/mscc_defconfig                   |  84 ++++
 arch/mips/mscc/Makefile                            |  11 +
 arch/mips/mscc/Platform                            |  12 +
 arch/mips/mscc/setup.c                             | 106 +++++
 drivers/irqchip/Kconfig                            |   5 +
 drivers/irqchip/Makefile                           |   1 +
 drivers/irqchip/irq-mscc-ocelot.c                  | 109 +++++
 drivers/pinctrl/Kconfig                            |  10 +
 drivers/pinctrl/Makefile                           |   1 +
 drivers/pinctrl/pinctrl-ocelot.c                   | 505 +++++++++++++++++++++
 drivers/power/reset/Kconfig                        |   7 +
 drivers/power/reset/Makefile                       |   1 +
 drivers/power/reset/ocelot-reset.c                 |  86 ++++
 25 files changed, 1244 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt
 create mode 100644 Documentation/devicetree/bindings/mips/mscc.txt
 create mode 100644 Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt
 create mode 100644 Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
 create mode 100644 arch/mips/boot/dts/mscc/Makefile
 create mode 100644 arch/mips/boot/dts/mscc/ocelot.dtsi
 create mode 100644 arch/mips/boot/dts/mscc/ocelot_pcb123.dts
 create mode 100644 arch/mips/configs/mscc_defconfig
 create mode 100644 arch/mips/mscc/Makefile
 create mode 100644 arch/mips/mscc/Platform
 create mode 100644 arch/mips/mscc/setup.c
 create mode 100644 drivers/irqchip/irq-mscc-ocelot.c
 create mode 100644 drivers/pinctrl/pinctrl-ocelot.c
 create mode 100644 drivers/power/reset/ocelot-reset.c

-- 
2.15.1

[PATCH v2 01/13] dt-bindings: Add vendor prefix for Microsemi Corporation

[Alexandre Belloni]

Microsemi Corporation provides semiconductor and system solutions for
aerospace & defense, communications, data center and industrial markets.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 0994bdd82cd3..7b880084fd37 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -219,6 +219,7 @@ motorola	Motorola, Inc.
 moxa	Moxa Inc.
 mpl	MPL AG
 mqmaker	mqmaker Inc.
+mscc	Microsemi Corporation
 msi	Micro-Star International Co. Ltd.
 mti	Imagination Technologies Ltd. (formerly MIPS Technologies Inc.)
 multi-inno	Multi-Inno Technology Co.,Ltd
-- 
2.15.1

[PATCH v2 02/13] dt-bindings: interrupt-controller: Add binding for the Microsemi Ocelot interrupt controller

[Alexandre Belloni]

Add the Device Tree binding documentation for the Microsemi Ocelot
interrupt controller that is part of the ICPU. It is connected directly to
the MIPS core interrupt controller.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../interrupt-controller/mscc,ocelot-icpu-intr.txt | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt b/Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt
new file mode 100644
index 000000000000..b47a8a02b17b
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt
@@ -0,0 +1,22 @@
+Microsemi Ocelot SoC ICPU Interrupt Controller
+
+Required properties:
+
+- compatible : should be "mscc,ocelot-icpu-intr"
+- reg : Specifies base physical address and size of the registers.
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The value shall be 1.
+- interrupt-parent : phandle of the CPU interrupt controller.
+- interrupts : Specifies the CPU interrupt the controller is connected to.
+
+Example:
+
+		intc: interrupt-controller@70000070 {
+			compatible = "mscc,ocelot-icpu-intr";
+			reg = <0x70000070 0x70>;
+			#interrupt-cells = <1>;
+			interrupt-controller;
+			interrupt-parent = <&cpuintc>;
+			interrupts = <2>;
+		};
-- 
2.15.1

[PATCH v2 03/13] irqchip: Add a driver for the Microsemi Ocelot controller

[Alexandre Belloni]

The Microsemi Ocelot SoC has a pretty simple IRQ controller in its ICPU
block. Add a driver for it.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/irqchip/Kconfig           |   5 ++
 drivers/irqchip/Makefile          |   1 +
 drivers/irqchip/irq-mscc-ocelot.c | 109 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 115 insertions(+)
 create mode 100644 drivers/irqchip/irq-mscc-ocelot.c

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index c70476b34a53..9605a872da1c 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -286,6 +286,11 @@ config IRQ_MXS
 	select IRQ_DOMAIN
 	select STMP_DEVICE
 
+config MSCC_OCELOT_IRQ
+	bool
+	select IRQ_DOMAIN
+	select GENERIC_IRQ_CHIP
+
 config MVEBU_GICP
 	bool
 
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index d2df34a54d38..dc549701782d 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_ARCH_SA1100)		+= irq-sa11x0.o
 obj-$(CONFIG_INGENIC_IRQ)		+= irq-ingenic.o
 obj-$(CONFIG_IMX_GPCV2)			+= irq-imx-gpcv2.o
 obj-$(CONFIG_PIC32_EVIC)		+= irq-pic32-evic.o
+obj-$(CONFIG_MSCC_OCELOT_IRQ)		+= irq-mscc-ocelot.o
 obj-$(CONFIG_MVEBU_GICP)		+= irq-mvebu-gicp.o
 obj-$(CONFIG_MVEBU_ICU)			+= irq-mvebu-icu.o
 obj-$(CONFIG_MVEBU_ODMI)		+= irq-mvebu-odmi.o
diff --git a/drivers/irqchip/irq-mscc-ocelot.c b/drivers/irqchip/irq-mscc-ocelot.c
new file mode 100644
index 000000000000..c2cf46758a59
--- /dev/null
+++ b/drivers/irqchip/irq-mscc-ocelot.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi Ocelot IRQ controller driver
+ *
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/interrupt.h>
+
+#define ICPU_CFG_INTR_INTR_STICKY	0x10
+#define ICPU_CFG_INTR_INTR_ENA		0x18
+#define ICPU_CFG_INTR_INTR_ENA_CLR	0x1c
+#define ICPU_CFG_INTR_INTR_ENA_SET	0x20
+#define ICPU_CFG_INTR_DST_INTR_IDENT(x)	(0x38 + 0x4 * (x))
+#define ICPU_CFG_INTR_INTR_TRIGGER(x)	(0x5c + 0x4 * (x))
+
+#define OCELOT_NR_IRQ 24
+
+static void ocelot_irq_unmask(struct irq_data *data)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
+	struct irq_chip_type *ct = irq_data_get_chip_type(data);
+	unsigned int mask = data->mask;
+	u32 val;
+
+	irq_gc_lock(gc);
+	val = irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(0)) |
+	      irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(1));
+	if ((val & mask) == 0)
+		irq_reg_writel(gc, mask, ICPU_CFG_INTR_INTR_STICKY);
+
+	*ct->mask_cache &= ~mask;
+	irq_reg_writel(gc, mask, ICPU_CFG_INTR_INTR_ENA_SET);
+	irq_gc_unlock(gc);
+}
+
+static void ocelot_irq_handler(struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct irq_domain *d = irq_desc_get_handler_data(desc);
+	struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
+	u32 reg = irq_reg_readl(gc, ICPU_CFG_INTR_DST_INTR_IDENT(0));
+
+	chained_irq_enter(chip, desc);
+
+	while (reg) {
+		u32 hwirq = __fls(reg);
+
+		generic_handle_irq(irq_find_mapping(d, hwirq));
+		reg &= ~(BIT(hwirq));
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static int __init ocelot_irq_init(struct device_node *node,
+				  struct device_node *parent)
+{
+	struct irq_domain *domain;
+	struct irq_chip_generic *gc;
+	int parent_irq, ret;
+
+	domain = irq_domain_add_linear(node, OCELOT_NR_IRQ,
+				       &irq_generic_chip_ops, NULL);
+	if (!domain) {
+		pr_err("%s: unable to add irq domain\n", node->name);
+		return -ENOMEM;
+	}
+
+	ret = irq_alloc_domain_generic_chips(domain, OCELOT_NR_IRQ, 1,
+					     "icpu", handle_level_irq,
+					     0, 0, 0);
+	if (ret) {
+		pr_err("%s: unable to alloc irq domain gc\n", node->name);
+		return ret;
+	}
+
+	gc = irq_get_domain_generic_chip(domain, 0);
+	gc->reg_base = of_iomap(node, 0);
+	if (!gc->reg_base) {
+		pr_err("%s: unable to map resource\n", node->name);
+		return -ENOMEM;
+	}
+
+	gc->chip_types[0].regs.ack = ICPU_CFG_INTR_INTR_STICKY;
+	gc->chip_types[0].regs.mask = ICPU_CFG_INTR_INTR_ENA_CLR;
+	gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
+	gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
+	gc->chip_types[0].chip.irq_unmask = ocelot_irq_unmask;
+
+	irq_reg_writel(gc, 0, ICPU_CFG_INTR_INTR_ENA); /* Mask all */
+	irq_reg_writel(gc, 0xffffffff, ICPU_CFG_INTR_INTR_STICKY); /* Ack pending */
+
+	parent_irq = irq_of_parse_and_map(node, 0);
+	if (!parent_irq)
+		return -EINVAL;
+
+	irq_set_chained_handler_and_data(parent_irq, ocelot_irq_handler,
+					 domain);
+
+	return 0;
+}
+IRQCHIP_DECLARE(ocelot_icpu, "mscc,ocelot-icpu-intr", ocelot_irq_init);
-- 
2.15.1

[PATCH v2 04/13] dt-bindings: pinctrl: Add bindings for Microsemi Ocelot

[Alexandre Belloni]

Add the documentation for the Microsemi Ocelot pinmuxing and gpio
controller.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../bindings/pinctrl/mscc,ocelot-pinctrl.txt       | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt
new file mode 100644
index 000000000000..24a210e0c59a
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt
@@ -0,0 +1,39 @@
+Microsemi Ocelot pin controller Device Tree Bindings
+----------------------------------------------------
+
+Required properties:
+ - compatible		: Should be "mscc,ocelot-pinctrl"
+ - reg			: Address and length of the register set for the device
+ - gpio-controller	: Indicates this device is a GPIO controller
+ - #gpio-cells		: Must be 2.
+			  The first cell is the pin number and the
+			  second cell specifies GPIO flags, as defined in
+			  <dt-bindings/gpio/gpio.h>.
+ - gpio-ranges		: Range of pins managed by the GPIO controller.
+
+
+The ocelot-pinctrl driver uses the generic pin multiplexing and generic pin
+configuration documented in pinctrl-bindings.txt.
+
+The following generic properties are supported:
+ - function
+ - pins
+
+Example:
+	gpio: pinctrl@71070034 {
+		compatible = "mscc,ocelot-pinctrl";
+		reg = <0x71070034 0x28>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-ranges = <&gpio 0 0 22>;
+
+		uart_pins: uart-pins {
+				pins = "GPIO_6", "GPIO_7";
+				function = "uart";
+		};
+
+		uart2_pins: uart2-pins {
+				pins = "GPIO_12", "GPIO_13";
+				function = "uart2";
+		};
+	};
-- 
2.15.1

[PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Alexandre Belloni]

The Microsemi Ocelot SoC has a few pins that can be used as GPIOs or take
multiple other functions. Add a driver for the pinmuxing and the GPIOs.

There is currently no support for interrupts.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/pinctrl/Kconfig          |  10 +
 drivers/pinctrl/Makefile         |   1 +
 drivers/pinctrl/pinctrl-ocelot.c | 505 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 516 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-ocelot.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 4571cc098b76..99c36baedbad 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -343,6 +343,16 @@ config PINCTRL_RK805
 	help
 	  This selects the pinctrl driver for RK805.
 
+config PINCTRL_OCELOT
+	bool "Pinctrl driver for the Microsemi Ocelot SoCs"
+	default y
+	depends on OF
+	depends on MSCC_OCELOT || COMPILE_TEST
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select REGMAP_MMIO
+
 source "drivers/pinctrl/aspeed/Kconfig"
 source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index d0d4844f8022..b1cae074a949 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 obj-$(CONFIG_PINCTRL_ZYNQ)	+= pinctrl-zynq.o
 obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
 obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
+obj-$(CONFIG_PINCTRL_OCELOT)	+= pinctrl-ocelot.o
 
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
 obj-y				+= bcm/
diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
new file mode 100644
index 000000000000..677e172bb945
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -0,0 +1,505 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi SoCs pinctrl driver
+ *
+ * Author: <alexandre.belloni@free-electrons.com>
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+
+#include <linux/compiler.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinmux.h"
+
+#define OCELOT_GPIO_OUT_SET	0x0
+#define OCELOT_GPIO_OUT_CLR	0x4
+#define OCELOT_GPIO_OUT		0x8
+#define OCELOT_GPIO_IN		0xc
+#define OCELOT_GPIO_OE		0x10
+#define OCELOT_GPIO_INTR	0x14
+#define OCELOT_GPIO_INTR_ENA	0x18
+#define OCELOT_GPIO_INTR_IDENT	0x1c
+#define OCELOT_GPIO_ALT0	0x20
+#define OCELOT_GPIO_ALT1	0x24
+#define OCELOT_GPIO_SD_MAP	0x28
+
+#define OCELOT_PINS		22
+#define OCELOT_FUNC_PER_PIN	4
+
+enum {
+	FUNC_NONE,
+	FUNC_GPIO,
+	FUNC_IRQ0_IN,
+	FUNC_IRQ0_OUT,
+	FUNC_IRQ1_IN,
+	FUNC_IRQ1_OUT,
+	FUNC_MIIM1,
+	FUNC_PCI_WAKE,
+	FUNC_PTP0,
+	FUNC_PTP1,
+	FUNC_PTP2,
+	FUNC_PTP3,
+	FUNC_PWM,
+	FUNC_RECO_CLK0,
+	FUNC_RECO_CLK1,
+	FUNC_SFP0,
+	FUNC_SFP1,
+	FUNC_SFP2,
+	FUNC_SFP3,
+	FUNC_SFP4,
+	FUNC_SFP5,
+	FUNC_SG0,
+	FUNC_SI,
+	FUNC_TACHO,
+	FUNC_TWI,
+	FUNC_TWI_SCL_M,
+	FUNC_UART,
+	FUNC_UART2,
+	FUNC_MAX
+};
+
+static const char *const ocelot_function_names[] = {
+	[FUNC_NONE]		= "none",
+	[FUNC_GPIO]		= "gpio",
+	[FUNC_IRQ0_IN]		= "irq0_in",
+	[FUNC_IRQ0_OUT]		= "irq0_out",
+	[FUNC_IRQ1_IN]		= "irq1_in",
+	[FUNC_IRQ1_OUT]		= "irq1_out",
+	[FUNC_MIIM1]		= "miim1",
+	[FUNC_PCI_WAKE]		= "pci_wake",
+	[FUNC_PTP0]		= "ptp0",
+	[FUNC_PTP1]		= "ptp1",
+	[FUNC_PTP2]		= "ptp2",
+	[FUNC_PTP3]		= "ptp3",
+	[FUNC_PWM]		= "pwm",
+	[FUNC_RECO_CLK0]	= "reco_clk0",
+	[FUNC_RECO_CLK1]	= "reco_clk1",
+	[FUNC_SFP0]		= "sfp0",
+	[FUNC_SFP1]		= "sfp1",
+	[FUNC_SFP2]		= "sfp2",
+	[FUNC_SFP3]		= "sfp3",
+	[FUNC_SFP4]		= "sfp4",
+	[FUNC_SFP5]		= "sfp5",
+	[FUNC_SG0]		= "sg0",
+	[FUNC_SI]		= "si",
+	[FUNC_TACHO]		= "tacho",
+	[FUNC_TWI]		= "twi",
+	[FUNC_TWI_SCL_M]	= "twi_scl_m",
+	[FUNC_UART]		= "uart",
+	[FUNC_UART2]		= "uart2",
+};
+
+struct ocelot_pmx_func {
+	const char **groups;
+	unsigned int ngroups;
+};
+
+struct ocelot_pin_caps {
+	unsigned int pin;
+	unsigned char functions[OCELOT_FUNC_PER_PIN];
+};
+
+struct ocelot_pinctrl {
+	struct device *dev;
+	struct pinctrl_dev *pctl;
+	struct gpio_chip gpio_chip;
+	struct regmap *map;
+	struct ocelot_pmx_func func[FUNC_MAX];
+};
+
+#define OCELOT_P(p, f0, f1, f2)						\
+static struct ocelot_pin_caps ocelot_pin_##p = {			\
+	.pin = p,							\
+	.functions = {							\
+			FUNC_GPIO, FUNC_##f0, FUNC_##f1, FUNC_##f2,	\
+	},								\
+}
+
+OCELOT_P(0,  SG0,       NONE,      NONE);
+OCELOT_P(1,  SG0,       NONE,      NONE);
+OCELOT_P(2,  SG0,       NONE,      NONE);
+OCELOT_P(3,  SG0,       NONE,      NONE);
+OCELOT_P(4,  IRQ0_IN,   IRQ0_OUT,  TWI);
+OCELOT_P(5,  IRQ1_IN,   IRQ1_OUT,  PCI_WAKE);
+OCELOT_P(6,  UART,      TWI_SCL_M, NONE);
+OCELOT_P(7,  UART,      TWI_SCL_M, NONE);
+OCELOT_P(8,  SI,        TWI_SCL_M, IRQ0_OUT);
+OCELOT_P(9,  SI,        TWI_SCL_M, IRQ1_OUT);
+OCELOT_P(10, PTP2,      TWI_SCL_M, SFP0);
+OCELOT_P(11, PTP3,      TWI_SCL_M, SFP1);
+OCELOT_P(12, UART2,     TWI_SCL_M, SFP2);
+OCELOT_P(13, UART2,     TWI_SCL_M, SFP3);
+OCELOT_P(14, MIIM1,     TWI_SCL_M, SFP4);
+OCELOT_P(15, MIIM1,     TWI_SCL_M, SFP5);
+OCELOT_P(16, TWI,       NONE,      SI);
+OCELOT_P(17, TWI,       TWI_SCL_M, SI);
+OCELOT_P(18, PTP0,      TWI_SCL_M, NONE);
+OCELOT_P(19, PTP1,      TWI_SCL_M, NONE);
+OCELOT_P(20, RECO_CLK0, TACHO,     NONE);
+OCELOT_P(21, RECO_CLK1, PWM,       NONE);
+
+#define OCELOT_PIN(n) {						\
+	.number = n,						\
+	.name = "GPIO_"#n,					\
+	.drv_data = &ocelot_pin_##n				\
+}
+
+static const struct pinctrl_pin_desc ocelot_pins[] = {
+	OCELOT_PIN(0),
+	OCELOT_PIN(1),
+	OCELOT_PIN(2),
+	OCELOT_PIN(3),
+	OCELOT_PIN(4),
+	OCELOT_PIN(5),
+	OCELOT_PIN(6),
+	OCELOT_PIN(7),
+	OCELOT_PIN(8),
+	OCELOT_PIN(9),
+	OCELOT_PIN(10),
+	OCELOT_PIN(11),
+	OCELOT_PIN(12),
+	OCELOT_PIN(13),
+	OCELOT_PIN(14),
+	OCELOT_PIN(15),
+	OCELOT_PIN(16),
+	OCELOT_PIN(17),
+	OCELOT_PIN(18),
+	OCELOT_PIN(19),
+	OCELOT_PIN(20),
+	OCELOT_PIN(21),
+};
+
+static int ocelot_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(ocelot_function_names);
+}
+
+static const char *ocelot_get_function_name(struct pinctrl_dev *pctldev,
+					    unsigned int function)
+{
+	return ocelot_function_names[function];
+}
+
+static int ocelot_get_function_groups(struct pinctrl_dev *pctldev,
+				      unsigned int function,
+				      const char *const **groups,
+				      unsigned *const num_groups)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups  = info->func[function].groups;
+	*num_groups = info->func[function].ngroups;
+
+	return 0;
+}
+
+static int ocelot_pin_function_idx(unsigned int pin, unsigned int function)
+{
+	struct ocelot_pin_caps *p = ocelot_pins[pin].drv_data;
+	int i;
+
+	for (i = 0; i < OCELOT_FUNC_PER_PIN; i++) {
+		if (function == p->functions[i])
+			return i;
+	}
+
+	return -1;
+}
+
+static int ocelot_pinmux_set_mux(struct pinctrl_dev *pctldev,
+				 unsigned int selector, unsigned int group)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct ocelot_pin_caps *pin = ocelot_pins[group].drv_data;
+	int f;
+
+	f = ocelot_pin_function_idx(group, selector);
+	if (f < 0)
+		return -EINVAL;
+
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(pin->pin),
+			   f << pin->pin);
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(pin->pin),
+			   f << (pin->pin - 1));
+
+	return 0;
+}
+
+static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned int pin, bool input)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
+			   input ? BIT(pin) : 0);
+
+	return 0;
+}
+
+static int ocelot_gpio_request_enable(struct pinctrl_dev *pctldev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned int offset)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(offset), 0);
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(offset), 0);
+
+	return 0;
+}
+
+static const struct pinmux_ops ocelot_pmx_ops = {
+	.get_functions_count = ocelot_get_functions_count,
+	.get_function_name = ocelot_get_function_name,
+	.get_function_groups = ocelot_get_function_groups,
+	.set_mux = ocelot_pinmux_set_mux,
+	.gpio_set_direction = ocelot_gpio_set_direction,
+	.gpio_request_enable = ocelot_gpio_request_enable,
+};
+
+static int ocelot_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(ocelot_pins);
+}
+
+static const char *ocelot_pctl_get_group_name(struct pinctrl_dev *pctldev,
+					      unsigned int group)
+{
+	return ocelot_pins[group].name;
+}
+
+static int ocelot_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+				      unsigned int group,
+				      const unsigned int **pins,
+				      unsigned int *num_pins)
+{
+	*pins = &ocelot_pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static const struct pinctrl_ops ocelot_pctl_ops = {
+	.get_groups_count = ocelot_pctl_get_groups_count,
+	.get_group_name = ocelot_pctl_get_group_name,
+	.get_group_pins = ocelot_pctl_get_group_pins,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinconf_generic_dt_free_map,
+};
+
+static struct pinctrl_desc ocelot_desc = {
+	.name = "ocelot-pinctrl",
+	.pins = ocelot_pins,
+	.npins = ARRAY_SIZE(ocelot_pins),
+	.pctlops = &ocelot_pctl_ops,
+	.pmxops = &ocelot_pmx_ops,
+	.owner = THIS_MODULE,
+};
+
+static int ocelot_create_group_func_map(struct device *dev,
+					struct ocelot_pinctrl *info)
+{
+	u16 pins[ARRAY_SIZE(ocelot_pins)];
+	int f, npins, i;
+
+	for (f = 0; f < FUNC_MAX; f++) {
+		for (npins = 0, i = 0; i < ARRAY_SIZE(ocelot_pins); i++) {
+			if (ocelot_pin_function_idx(i, f) >= 0)
+				pins[npins++] = i;
+		}
+
+		info->func[f].ngroups = npins;
+		info->func[f].groups = devm_kzalloc(dev, npins *
+							 sizeof(char *),
+							 GFP_KERNEL);
+		if (!info->func[f].groups)
+			return -ENOMEM;
+
+		for (i = 0; i < npins; i++)
+			info->func[f].groups[i] = ocelot_pins[pins[i]].name;
+	}
+
+	return 0;
+}
+
+static int ocelot_pinctrl_register(struct platform_device *pdev,
+				   struct ocelot_pinctrl *info)
+{
+	int ret;
+
+	ret = ocelot_create_group_func_map(&pdev->dev, info);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to create group func map.\n");
+		return ret;
+	}
+
+	info->pctl = devm_pinctrl_register(&pdev->dev, &ocelot_desc, info);
+	if (IS_ERR(info->pctl)) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return PTR_ERR(info->pctl);
+	}
+
+	return 0;
+}
+
+static int ocelot_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int val;
+
+	regmap_read(info->map, OCELOT_GPIO_IN, &val);
+
+	return !!(val & BIT(offset));
+}
+
+static void ocelot_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+
+	if (value)
+		regmap_write(info->map, OCELOT_GPIO_OUT_SET, BIT(offset));
+	else
+		regmap_write(info->map, OCELOT_GPIO_OUT_CLR, BIT(offset));
+}
+
+static int ocelot_gpio_get_direction(struct gpio_chip *chip,
+				     unsigned int offset)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int val;
+
+	regmap_read(info->map, OCELOT_GPIO_OE, &val);
+
+	return !(val & BIT(offset));
+}
+
+static int ocelot_gpio_direction_input(struct gpio_chip *chip,
+				       unsigned int offset)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+
+	return regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(offset), 0);
+}
+
+static int ocelot_gpio_direction_output(struct gpio_chip *chip,
+					unsigned int offset, int value)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int pin = BIT(offset);
+
+	if (value)
+		regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
+	else
+		regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);
+
+	return regmap_update_bits(info->map, OCELOT_GPIO_OE, pin, pin);
+}
+
+static const struct gpio_chip ocelot_gpiolib_chip = {
+	.request = gpiochip_generic_request,
+	.free = gpiochip_generic_free,
+	.set = ocelot_gpio_set,
+	.get = ocelot_gpio_get,
+	.get_direction = ocelot_gpio_get_direction,
+	.direction_input = ocelot_gpio_direction_input,
+	.direction_output = ocelot_gpio_direction_output,
+	.owner = THIS_MODULE,
+};
+
+static int ocelot_gpiochip_register(struct platform_device *pdev,
+				    struct ocelot_pinctrl *info)
+{
+	struct gpio_chip *gc;
+	int ret;
+
+	info->gpio_chip = ocelot_gpiolib_chip;
+
+	gc = &info->gpio_chip;
+	gc->ngpio = OCELOT_PINS;
+	gc->parent = &pdev->dev;
+	gc->base = 0;
+	gc->of_node = info->dev->of_node;
+	gc->label = "ocelot-gpio";
+
+	ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
+	if (ret)
+		return ret;
+	//TODO irqchip
+
+	return 0;
+}
+
+static const struct regmap_config ocelot_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static const struct of_device_id ocelot_pinctrl_of_match[] = {
+	{ .compatible = "mscc,ocelot-pinctrl" },
+	{},
+};
+
+int ocelot_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ocelot_pinctrl *info;
+	void __iomem *base;
+	int ret;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	base = devm_ioremap_resource(dev,
+			platform_get_resource(pdev, IORESOURCE_MEM, 0));
+	if (IS_ERR(base)) {
+		dev_err(dev, "Failed to ioremap registers\n");
+		return PTR_ERR(base);
+	}
+
+	info->map = devm_regmap_init_mmio(dev, base,
+					  &ocelot_pinctrl_regmap_config);
+	if (IS_ERR(info->map)) {
+		dev_err(dev, "Failed to create regmap\n");
+		return PTR_ERR(info->map);
+	}
+	dev_set_drvdata(dev, info->map);
+	info->dev = dev;
+
+	ret = ocelot_pinctrl_register(pdev, info);
+	if (ret)
+		return ret;
+
+	ret = ocelot_gpiochip_register(pdev, info);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct platform_driver ocelot_pinctrl_driver = {
+	.driver = {
+		.name = "pinctrl-ocelot",
+		.of_match_table = of_match_ptr(ocelot_pinctrl_of_match),
+		.suppress_bind_attrs = true,
+	},
+	.probe = ocelot_pinctrl_probe,
+};
+builtin_platform_driver(ocelot_pinctrl_driver);
-- 
2.15.1

[PATCH v2 06/13] dt-bindings: mips: Add bindings for Microsemi SoCs

[Alexandre Belloni]

Add bindings for Microsemi SoCs. Currently only Ocelot is supported.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 Documentation/devicetree/bindings/mips/mscc.txt | 46 +++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mips/mscc.txt

diff --git a/Documentation/devicetree/bindings/mips/mscc.txt b/Documentation/devicetree/bindings/mips/mscc.txt
new file mode 100644
index 000000000000..1bb578b9d135
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/mscc.txt
@@ -0,0 +1,46 @@
+* Microsemi MIPS CPUs
+
+Boards with a SoC of the Microsemi MIPS family shall have the following
+properties:
+
+Required properties:
+- compatible: "mscc,ocelot"
+- mips-hpt-frequency: CPU counter frequency.
+
+
+* Other peripherals:
+
+o CPU chip regs:
+
+The SoC has a few registers (DEVCPU_GCB:CHIP_REGS) handling miscellaneous
+functionalities: chip ID, general purpose register for software use, reset
+controller, hardware status and configuration, efuses.
+
+Required properties:
+- compatible: Should be "mscc,ocelot-chip-regs", "simple-mfd", "syscon"
+- reg : Should contain registers location and length
+
+Example:
+	syscon@71070000 {
+		compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
+		reg = <0x71070000 0x1c>;
+	};
+
+
+o CPU system control:
+
+The SoC has a few registers (ICPU_CFG:CPU_SYSTEM_CTRL) handling configuration of
+the CPU: 8 general purpose registers, reset control, CPU en/disabling, CPU
+endianess, CPU bus control, CPU status.
+
+Required properties:
+- compatible: Should be "mscc,ocelot-cpu-syscon", "syscon"
+- reg : Should contain registers location and length
+
+Example:
+	syscon@70000000 {
+		compatible = "mscc,ocelot-cpu-syscon", "syscon";
+		reg = <0x70000000 0x2c>;
+	};
+
+
-- 
2.15.1

[PATCH v2 07/13] dt-bindings: power: reset: Document ocelot-reset binding

[Alexandre Belloni]

Add binding documentation for the Microsemi Ocelot reset block.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 .../devicetree/bindings/power/reset/ocelot-reset.txt    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/ocelot-reset.txt

diff --git a/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
new file mode 100644
index 000000000000..1bcf276b04cb
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
@@ -0,0 +1,17 @@
+Microsemi Ocelot reset controller
+
+The DEVCPU_GCB:CHIP_REGS have a SOFT_RST register that can be used to reset the
+SoC MIPS core.
+
+Required Properties:
+ - compatible: "mscc,ocelot-chip-reset"
+
+Example:
+	syscon@71070000 {
+		compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
+		reg = <0x71070000 0x1c>;
+
+		reset {
+			compatible = "mscc,ocelot-chip-reset";
+		};
+	};
-- 
2.15.1

[PATCH v2 08/13] power: reset: Add a driver for the Microsemi Ocelot reset

[Alexandre Belloni]

The Microsemi Ocelot SoC has a register allowing to reset the MIPS core.
Unfortunately, the syscon-reboot driver can't be used directly (but almost)
as the reset control may be disabled using another register.

Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/power/reset/Kconfig        |  7 ++++
 drivers/power/reset/Makefile       |  1 +
 drivers/power/reset/ocelot-reset.c | 86 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 drivers/power/reset/ocelot-reset.c

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index ca0de1a78e85..2372f8e1040d 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -113,6 +113,13 @@ config POWER_RESET_MSM
 	help
 	  Power off and restart support for Qualcomm boards.
 
+config POWER_RESET_OCELOT_RESET
+	bool "Microsemi Ocelot reset driver"
+	depends on MSCC_OCELOT || COMPILE_TEST
+	select MFD_SYSCON
+	help
+	  This driver supports restart for Microsemi Ocelot SoC.
+
 config POWER_RESET_PIIX4_POWEROFF
 	tristate "Intel PIIX4 power-off driver"
 	depends on PCI
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index aeb65edb17b7..df9d92291c67 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
 obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
 obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
+obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
 obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
 obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
new file mode 100644
index 000000000000..1fb14bf17191
--- /dev/null
+++ b/drivers/power/reset/ocelot-reset.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi MIPS SoC reset driver
+ *
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/notifier.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+struct ocelot_reset_context {
+	struct regmap *chip_regs;
+	struct regmap *cpu_ctrl;
+	struct notifier_block restart_handler;
+};
+
+#define ICPU_CFG_CPU_SYSTEM_CTRL_RESET 0x20
+#define CORE_RST_PROTECT BIT(2)
+
+#define CHIP_REGS_SOFT_RST 0x8
+#define SOFT_CHIP_RST BIT(0)
+
+static int ocelot_restart_handle(struct notifier_block *this,
+				 unsigned long mode, void *cmd)
+{
+	struct ocelot_reset_context *ctx = container_of(this, struct
+							ocelot_reset_context,
+							restart_handler);
+
+	/* Make sure the core is not protected from reset */
+	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
+			   CORE_RST_PROTECT, 0);
+
+	regmap_write(ctx->chip_regs, CHIP_REGS_SOFT_RST, SOFT_CHIP_RST);
+
+	pr_emerg("Unable to restart system\n");
+	return NOTIFY_DONE;
+}
+
+static int ocelot_reset_probe(struct platform_device *pdev)
+{
+	struct ocelot_reset_context *ctx;
+	struct device *dev = &pdev->dev;
+	int err;
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->chip_regs = syscon_node_to_regmap(of_get_parent(dev->of_node));
+	if (IS_ERR(ctx->chip_regs))
+		return PTR_ERR(ctx->chip_regs);
+
+	ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
+	if (IS_ERR(ctx->cpu_ctrl))
+		return PTR_ERR(ctx->cpu_ctrl);
+
+	ctx->restart_handler.notifier_call = ocelot_restart_handle;
+	ctx->restart_handler.priority = 192;
+	err = register_restart_handler(&ctx->restart_handler);
+	if (err)
+		dev_err(dev, "can't register restart notifier (err=%d)\n", err);
+
+	return err;
+}
+
+static const struct of_device_id ocelot_reset_of_match[] = {
+	{ .compatible = "mscc,ocelot-chip-reset" },
+	{}
+};
+
+static struct platform_driver ocelot_reset_driver = {
+	.probe = ocelot_reset_probe,
+	.driver = {
+		.name = "ocelot-chip-reset",
+		.of_match_table = ocelot_reset_of_match,
+	},
+};
+builtin_platform_driver(ocelot_reset_driver);
-- 
2.15.1

[PATCH v2 09/13] MIPS: mscc: Add initial support for Microsemi MIPS SoCs

[Alexandre Belloni]

Introduce support for the MIPS based Microsemi Ocelot SoCs.
As the plan is to have all SoCs supported only using device tree, the
mach directory is simply called mscc.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 arch/mips/Kbuild.platforms |   1 +
 arch/mips/Kconfig          |  24 ++++++++++
 arch/mips/mscc/Makefile    |  11 +++++
 arch/mips/mscc/Platform    |  12 +++++
 arch/mips/mscc/setup.c     | 106 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 154 insertions(+)
 create mode 100644 arch/mips/mscc/Makefile
 create mode 100644 arch/mips/mscc/Platform
 create mode 100644 arch/mips/mscc/setup.c

diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index ac7ad54f984f..b3b2f8dc91db 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -18,6 +18,7 @@ platforms += lantiq
 platforms += lasat
 platforms += loongson32
 platforms += loongson64
+platforms += mscc
 platforms += mti-malta
 platforms += netlogic
 platforms += paravirt
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 350a990fc719..a9db028a0338 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -527,6 +527,30 @@ config MIPS_MALTA
 	  This enables support for the MIPS Technologies Malta evaluation
 	  board.
 
+config MSCC_OCELOT
+	bool "Microsemi Ocelot architecture"
+	select BOOT_RAW
+	select CEVT_R4K
+	select CSRC_R4K
+	select IRQ_MIPS_CPU
+	select DMA_NONCOHERENT
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_BIG_ENDIAN
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_HAS_EARLY_PRINTK
+	select USE_GENERIC_EARLY_PRINTK_8250
+	select MSCC_OCELOT_IRQ
+	select PINCTRL
+	select GPIOLIB
+	select COMMON_CLK
+	select USE_OF
+	select BUILTIN_DTB
+	select LIBFDT
+	help
+	  This enables support for the Microsemi Ocelot architecture.
+	  It builds a generic DT-based kernel image.
+
 config MACH_PIC32
 	bool "Microchip PIC32 Family"
 	help
diff --git a/arch/mips/mscc/Makefile b/arch/mips/mscc/Makefile
new file mode 100644
index 000000000000..c96b13546730
--- /dev/null
+++ b/arch/mips/mscc/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: (GPL-2.0 OR MIT)
+#
+# Microsemi MIPS SoC support
+#
+# License: Dual MIT/GPL
+# Copyright (c) 2017 Microsemi Corporation
+
+#
+# Makefile for the Microsemi MIPS SoCs
+#
+obj-y := setup.o
diff --git a/arch/mips/mscc/Platform b/arch/mips/mscc/Platform
new file mode 100644
index 000000000000..9ae874c8f136
--- /dev/null
+++ b/arch/mips/mscc/Platform
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: (GPL-2.0 OR MIT)
+#
+# Microsemi MIPS SoC support
+#
+# License: Dual MIT/GPL
+# Copyright (c) 2017 Microsemi Corporation
+
+#
+# Microsemi Ocelot board(s)
+#
+platform-$(CONFIG_MSCC_OCELOT) += mscc/
+load-$(CONFIG_MSCC_OCELOT)	 += 0x80100000
diff --git a/arch/mips/mscc/setup.c b/arch/mips/mscc/setup.c
new file mode 100644
index 000000000000..77803edd7bfd
--- /dev/null
+++ b/arch/mips/mscc/setup.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi MIPS SoC support
+ *
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/libfdt.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/reboot.h>
+
+#include <asm/time.h>
+#include <asm/idle.h>
+#include <asm/prom.h>
+#include <asm/reboot.h>
+
+static void __init ocelot_earlyprintk_init(void)
+{
+	void __iomem *uart_base;
+
+	uart_base = ioremap_nocache(0x70100000, 0x0f);
+	setup_8250_early_printk_port((unsigned long)uart_base, 2, 50000);
+}
+
+void __init prom_init(void)
+{
+	/* Sanity check for defunct bootloader */
+	if (fw_arg0 < 10 && (fw_arg1 & 0xFFF00000) == 0x80000000) {
+		unsigned int prom_argc = fw_arg0;
+		const char **prom_argv = (const char **)fw_arg1;
+
+		if (prom_argc > 1 && strlen(prom_argv[1]) > 0)
+			/* ignore all built-in args if any f/w args given */
+			strcpy(arcs_cmdline, prom_argv[1]);
+	}
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+unsigned int get_c0_compare_int(void)
+{
+	return CP0_LEGACY_COMPARE_IRQ;
+}
+
+void __init plat_time_init(void)
+{
+	struct device_node *np;
+	u32 freq;
+
+	np = of_find_node_by_name(NULL, "cpus");
+	if (!np)
+		panic("missing 'cpus' DT node");
+	if (of_property_read_u32(np, "mips-hpt-frequency", &freq) < 0)
+		panic("missing 'mips-hpt-frequency' property");
+	of_node_put(np);
+
+	mips_hpt_frequency = freq;
+}
+
+void __init arch_init_irq(void)
+{
+	irqchip_init();
+}
+
+const char *get_system_type(void)
+{
+	return "Microsemi Ocelot";
+}
+
+static void __init ocelot_late_init(void)
+{
+	ocelot_earlyprintk_init();
+}
+
+extern void (*late_time_init)(void);
+
+void __init plat_mem_setup(void)
+{
+	/* This has to be done so late because ioremap needs to work */
+	late_time_init = ocelot_late_init;
+
+	__dt_setup_arch(__dtb_start);
+}
+
+void __init device_tree_init(void)
+{
+	if (!initial_boot_params)
+		return;
+
+	unflatten_and_copy_device_tree();
+}
+
+static int __init populate_machine(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	return 0;
+}
+arch_initcall(populate_machine);
-- 
2.15.1

[PATCH v2 10/13] MIPS: mscc: add ocelot dtsi

[Alexandre Belloni]

Add a device tree include file for the Microsemi Ocelot SoC.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 arch/mips/boot/dts/Makefile         |   1 +
 arch/mips/boot/dts/mscc/Makefile    |   4 ++
 arch/mips/boot/dts/mscc/ocelot.dtsi | 115 ++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)
 create mode 100644 arch/mips/boot/dts/mscc/Makefile
 create mode 100644 arch/mips/boot/dts/mscc/ocelot.dtsi

diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
index e2c6f131c8eb..1e79cab8e269 100644
--- a/arch/mips/boot/dts/Makefile
+++ b/arch/mips/boot/dts/Makefile
@@ -4,6 +4,7 @@ subdir-y	+= cavium-octeon
 subdir-y	+= img
 subdir-y	+= ingenic
 subdir-y	+= lantiq
+subdir-y	+= mscc
 subdir-y	+= mti
 subdir-y	+= netlogic
 subdir-y	+= ni
diff --git a/arch/mips/boot/dts/mscc/Makefile b/arch/mips/boot/dts/mscc/Makefile
new file mode 100644
index 000000000000..f0a155a74e02
--- /dev/null
+++ b/arch/mips/boot/dts/mscc/Makefile
@@ -0,0 +1,4 @@
+obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
+
+# Force kbuild to make empty built-in.o if necessary
+obj-				+= dummy.o
diff --git a/arch/mips/boot/dts/mscc/ocelot.dtsi b/arch/mips/boot/dts/mscc/ocelot.dtsi
new file mode 100644
index 000000000000..97f85431aa16
--- /dev/null
+++ b/arch/mips/boot/dts/mscc/ocelot.dtsi
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/* Copyright (c) 2017 Microsemi Corporation */
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "mscc,ocelot";
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		mips-hpt-frequency = <250000000>;
+
+		cpu@0 {
+			compatible = "mscc,ocelot";
+			device_type = "cpu";
+			reg = <0>;
+		};
+	};
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	cpuintc: interrupt-controller@0 {
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+		interrupt-controller;
+		compatible = "mti,cpu-interrupt-controller";
+	};
+
+	ahb_clk: ahb-clk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <250000000>;
+	};
+
+	ahb {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0x70000000 0x2000000>;
+
+		interrupt-parent = <&intc>;
+
+		cpu_ctrl: syscon@0 {
+			compatible = "mscc,ocelot-cpu-syscon", "syscon";
+			reg = <0x0 0x2c>;
+		};
+
+		intc: interrupt-controller@70 {
+			compatible = "mscc,ocelot-icpu-intr";
+			reg = <0x70 0x70>;
+			#interrupt-cells = <1>;
+			interrupt-controller;
+			interrupt-parent = <&cpuintc>;
+			interrupts = <2>;
+		};
+
+		uart0: serial@100000 {
+			pinctrl-0 = <&uart_pins>;
+			pinctrl-names = "default";
+			compatible = "ns16550a";
+			reg = <0x100000 0x20>;
+			interrupts = <6>;
+			clocks = <&ahb_clk>;
+			reg-io-width = <4>;
+			reg-shift = <2>;
+
+			status = "disabled";
+		};
+
+		uart2: serial@100800 {
+			pinctrl-0 = <&uart2_pins>;
+			pinctrl-names = "default";
+			compatible = "ns16550a";
+			reg = <0x100800 0x20>;
+			interrupts = <7>;
+			clocks = <&ahb_clk>;
+			reg-io-width = <4>;
+			reg-shift = <2>;
+
+			status = "disabled";
+		};
+
+		chip_regs: syscon@1070000 {
+			compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
+			reg = <0x1070000 0x1c>;
+
+			reset {
+				compatible = "mscc,ocelot-chip-reset";
+				mscc,cpucontrol = <&cpu_ctrl>;
+			};
+		};
+
+		gpio: pinctrl@1070034 {
+			compatible = "mscc,ocelot-pinctrl";
+			reg = <0x1070034 0x28>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio-ranges = <&gpio 0 0 22>;
+
+			uart_pins: uart-pins {
+				pins = "GPIO_6", "GPIO_7";
+				function = "uart";
+			};
+
+			uart2_pins: uart2-pins {
+				pins = "GPIO_12", "GPIO_13";
+				function = "uart2";
+			};
+		};
+	};
+};
-- 
2.15.1

[PATCH v2 11/13] MIPS: mscc: add ocelot PCB123 device tree

[Alexandre Belloni]

Add a device tree for the Microsemi Ocelot PCB123 evaluation board.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 arch/mips/boot/dts/mscc/Makefile          |  2 ++
 arch/mips/boot/dts/mscc/ocelot_pcb123.dts | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 arch/mips/boot/dts/mscc/ocelot_pcb123.dts

diff --git a/arch/mips/boot/dts/mscc/Makefile b/arch/mips/boot/dts/mscc/Makefile
index f0a155a74e02..09a1c4b97de2 100644
--- a/arch/mips/boot/dts/mscc/Makefile
+++ b/arch/mips/boot/dts/mscc/Makefile
@@ -1,3 +1,5 @@
+dtb-$(CONFIG_MSCC_OCELOT)	+= ocelot_pcb123.dtb
+
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
 
 # Force kbuild to make empty built-in.o if necessary
diff --git a/arch/mips/boot/dts/mscc/ocelot_pcb123.dts b/arch/mips/boot/dts/mscc/ocelot_pcb123.dts
new file mode 100644
index 000000000000..42bd404471f6
--- /dev/null
+++ b/arch/mips/boot/dts/mscc/ocelot_pcb123.dts
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/* Copyright (c) 2017 Microsemi Corporation */
+
+/dts-v1/;
+
+#include "ocelot.dtsi"
+
+/ {
+	compatible = "mscc,ocelot-pcb123", "mscc,ocelot";
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x0 0x0e000000>;
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
-- 
2.15.1

[PATCH v2 12/13] MIPS: defconfigs: add a defconfig for Microsemi SoCs

[Alexandre Belloni]

Add a defconfg that reaches userspace for Microsemi Ocelot.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 arch/mips/configs/mscc_defconfig | 84 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 arch/mips/configs/mscc_defconfig

diff --git a/arch/mips/configs/mscc_defconfig b/arch/mips/configs/mscc_defconfig
new file mode 100644
index 000000000000..58cf09b1ae82
--- /dev/null
+++ b/arch/mips/configs/mscc_defconfig
@@ -0,0 +1,84 @@
+CONFIG_MSCC_OCELOT=y
+CONFIG_CPU_LITTLE_ENDIAN=y
+CONFIG_MIPS_ELF_APPENDED_DTB=y
+CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER=y
+# CONFIG_SWAP is not set
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+# CONFIG_SHMEM is not set
+CONFIG_EMBEDDED=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_SUSPEND is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_NETFILTER=y
+CONFIG_NF_CONNTRACK=y
+# CONFIG_NF_CT_PROTO_DCCP is not set
+# CONFIG_NF_CT_PROTO_SCTP is not set
+# CONFIG_NF_CT_PROTO_UDPLITE is not set
+CONFIG_NETFILTER_XT_MATCH_IPRANGE=y
+CONFIG_NETFILTER_XT_MATCH_LIMIT=y
+CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
+CONFIG_IP_NF_IPTABLES=y
+CONFIG_IP_NF_FILTER=y
+CONFIG_IP_NF_TARGET_REJECT=y
+CONFIG_IP6_NF_IPTABLES=y
+CONFIG_IP6_NF_FILTER=y
+CONFIG_VLAN_8021Q=y
+CONFIG_NET_SWITCHDEV=y
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_MTD=y
+CONFIG_MTD_CMDLINE_PARTS=y
+CONFIG_MTD_BLOCK=y
+CONFIG_MTD_M25P80=y
+CONFIG_MTD_NAND=y
+CONFIG_MTD_NAND_PLATFORM=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_UBI=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_NETDEVICES=y
+CONFIG_TUN=y
+CONFIG_MICROSEMI_PHY=y
+# CONFIG_WLAN is not set
+# CONFIG_INPUT is not set
+# CONFIG_SERIO is not set
+# CONFIG_VT is not set
+CONFIG_N_GSM=y
+CONFIG_DEVKMEM=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=2
+CONFIG_SERIAL_8250_RUNTIME_UARTS=2
+CONFIG_SERIAL_OF_PLATFORM=y
+# CONFIG_HW_RANDOM is not set
+CONFIG_I2C=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_MUX=y
+CONFIG_SPI=y
+CONFIG_SPI_BITBANG=y
+CONFIG_SPI_DESIGNWARE=y
+CONFIG_SPI_SPIDEV=y
+CONFIG_GPIO_SYSFS=y
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_OCELOT_RESET=y
+CONFIG_SENSORS_TMP401=y
+# CONFIG_USB_SUPPORT is not set
+CONFIG_UIO=y
+CONFIG_UIO_PDRV_GENIRQ=y
+CONFIG_OVERLAY_FS=y
+CONFIG_JFFS2_FS=y
+CONFIG_UBIFS_FS=y
+CONFIG_SQUASHFS=y
+CONFIG_SQUASHFS_XZ=y
+# CONFIG_NETWORK_FILESYSTEMS is not set
+CONFIG_PRINTK_TIME=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x0
+# CONFIG_EARLY_PRINTK is not set
+# CONFIG_CRYPTO_HW is not set
-- 
2.15.1

[PATCH v2 13/13] MAINTAINERS: Add entry for Microsemi MIPS SoCs

[Alexandre Belloni]

Add myself as a maintainer for the Microsemi MIPS SoCs.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index aa71ab52fd76..a71fa0ac0abb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9062,6 +9062,13 @@ S:	Maintained
 F:	drivers/usb/misc/usb251xb.c
 F:	Documentation/devicetree/bindings/usb/usb251xb.txt
 
+MICROSEMI MIPS SOCS
+M:	Alexandre Belloni <alexandre.belloni@free-electrons.com>
+L:	linux-mips@linux-mips.org
+S:	Maintained
+F:	arch/mips/mscc/
+F:	arch/mips/boot/dts/mscc/
+
 MICROSEMI SMART ARRAY SMARTPQI DRIVER (smartpqi)
 M:	Don Brace <don.brace@microsemi.com>
 L:	esc.storagedev@microsemi.com
-- 
2.15.1

Re: [PATCH v2 08/13] power: reset: Add a driver for the Microsemi Ocelot reset

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 5093 bytes --]

Hi,

On Fri, Dec 08, 2017 at 04:46:13PM +0100, Alexandre Belloni wrote:
> The Microsemi Ocelot SoC has a register allowing to reset the MIPS core.
> Unfortunately, the syscon-reboot driver can't be used directly (but almost)
> as the reset control may be disabled using another register.
> 
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

Is it safe to apply this and the DT binding patch (once it has Rob's
Ack-by) via the power-supply tree?

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

-- Sebastian

>  drivers/power/reset/Kconfig        |  7 ++++
>  drivers/power/reset/Makefile       |  1 +
>  drivers/power/reset/ocelot-reset.c | 86 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 94 insertions(+)
>  create mode 100644 drivers/power/reset/ocelot-reset.c
> 
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index ca0de1a78e85..2372f8e1040d 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -113,6 +113,13 @@ config POWER_RESET_MSM
>  	help
>  	  Power off and restart support for Qualcomm boards.
>  
> +config POWER_RESET_OCELOT_RESET
> +	bool "Microsemi Ocelot reset driver"
> +	depends on MSCC_OCELOT || COMPILE_TEST
> +	select MFD_SYSCON
> +	help
> +	  This driver supports restart for Microsemi Ocelot SoC.
> +
>  config POWER_RESET_PIIX4_POWEROFF
>  	tristate "Intel PIIX4 power-off driver"
>  	depends on PCI
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index aeb65edb17b7..df9d92291c67 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
>  obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
>  obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
>  obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
> +obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
>  obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
>  obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
>  obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
> diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
> new file mode 100644
> index 000000000000..1fb14bf17191
> --- /dev/null
> +++ b/drivers/power/reset/ocelot-reset.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Microsemi MIPS SoC reset driver
> + *
> + * License: Dual MIT/GPL
> + * Copyright (c) 2017 Microsemi Corporation
> + */
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/notifier.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +#include <linux/regmap.h>
> +
> +struct ocelot_reset_context {
> +	struct regmap *chip_regs;
> +	struct regmap *cpu_ctrl;
> +	struct notifier_block restart_handler;
> +};
> +
> +#define ICPU_CFG_CPU_SYSTEM_CTRL_RESET 0x20
> +#define CORE_RST_PROTECT BIT(2)
> +
> +#define CHIP_REGS_SOFT_RST 0x8
> +#define SOFT_CHIP_RST BIT(0)
> +
> +static int ocelot_restart_handle(struct notifier_block *this,
> +				 unsigned long mode, void *cmd)
> +{
> +	struct ocelot_reset_context *ctx = container_of(this, struct
> +							ocelot_reset_context,
> +							restart_handler);
> +
> +	/* Make sure the core is not protected from reset */
> +	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
> +			   CORE_RST_PROTECT, 0);
> +
> +	regmap_write(ctx->chip_regs, CHIP_REGS_SOFT_RST, SOFT_CHIP_RST);
> +
> +	pr_emerg("Unable to restart system\n");
> +	return NOTIFY_DONE;
> +}
> +
> +static int ocelot_reset_probe(struct platform_device *pdev)
> +{
> +	struct ocelot_reset_context *ctx;
> +	struct device *dev = &pdev->dev;
> +	int err;
> +
> +	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->chip_regs = syscon_node_to_regmap(of_get_parent(dev->of_node));
> +	if (IS_ERR(ctx->chip_regs))
> +		return PTR_ERR(ctx->chip_regs);
> +
> +	ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
> +	if (IS_ERR(ctx->cpu_ctrl))
> +		return PTR_ERR(ctx->cpu_ctrl);
> +
> +	ctx->restart_handler.notifier_call = ocelot_restart_handle;
> +	ctx->restart_handler.priority = 192;
> +	err = register_restart_handler(&ctx->restart_handler);
> +	if (err)
> +		dev_err(dev, "can't register restart notifier (err=%d)\n", err);
> +
> +	return err;
> +}
> +
> +static const struct of_device_id ocelot_reset_of_match[] = {
> +	{ .compatible = "mscc,ocelot-chip-reset" },
> +	{}
> +};
> +
> +static struct platform_driver ocelot_reset_driver = {
> +	.probe = ocelot_reset_probe,
> +	.driver = {
> +		.name = "ocelot-chip-reset",
> +		.of_match_table = ocelot_reset_of_match,
> +	},
> +};
> +builtin_platform_driver(ocelot_reset_driver);
> -- 
> 2.15.1
> 

[-- Attachment #2: signature.asc --]
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Re: [PATCH v2 08/13] power: reset: Add a driver for the Microsemi Ocelot reset

[Alexandre Belloni]

On 08/12/2017 at 18:07:55 +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Dec 08, 2017 at 04:46:13PM +0100, Alexandre Belloni wrote:
> > The Microsemi Ocelot SoC has a register allowing to reset the MIPS core.
> > Unfortunately, the syscon-reboot driver can't be used directly (but almost)
> > as the reset control may be disabled using another register.
> > 
> > Cc: Sebastian Reichel <sre@kernel.org>
> > Cc: linux-pm@vger.kernel.org
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> 
> Is it safe to apply this and the DT binding patch (once it has Rob's
> Ack-by) via the power-supply tree?
> 

Absolutely, and I think this is the best plan.

> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
> 
> -- Sebastian
> 
> >  drivers/power/reset/Kconfig        |  7 ++++
> >  drivers/power/reset/Makefile       |  1 +
> >  drivers/power/reset/ocelot-reset.c | 86 ++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 94 insertions(+)
> >  create mode 100644 drivers/power/reset/ocelot-reset.c
> > 
> > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> > index ca0de1a78e85..2372f8e1040d 100644
> > --- a/drivers/power/reset/Kconfig
> > +++ b/drivers/power/reset/Kconfig
> > @@ -113,6 +113,13 @@ config POWER_RESET_MSM
> >  	help
> >  	  Power off and restart support for Qualcomm boards.
> >  
> > +config POWER_RESET_OCELOT_RESET
> > +	bool "Microsemi Ocelot reset driver"
> > +	depends on MSCC_OCELOT || COMPILE_TEST
> > +	select MFD_SYSCON
> > +	help
> > +	  This driver supports restart for Microsemi Ocelot SoC.
> > +
> >  config POWER_RESET_PIIX4_POWEROFF
> >  	tristate "Intel PIIX4 power-off driver"
> >  	depends on PCI
> > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> > index aeb65edb17b7..df9d92291c67 100644
> > --- a/drivers/power/reset/Makefile
> > +++ b/drivers/power/reset/Makefile
> > @@ -12,6 +12,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
> >  obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
> >  obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
> >  obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
> > +obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
> >  obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
> >  obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
> >  obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
> > diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
> > new file mode 100644
> > index 000000000000..1fb14bf17191
> > --- /dev/null
> > +++ b/drivers/power/reset/ocelot-reset.c
> > @@ -0,0 +1,86 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Microsemi MIPS SoC reset driver
> > + *
> > + * License: Dual MIT/GPL
> > + * Copyright (c) 2017 Microsemi Corporation
> > + */
> > +#include <linux/delay.h>
> > +#include <linux/io.h>
> > +#include <linux/notifier.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/reboot.h>
> > +#include <linux/regmap.h>
> > +
> > +struct ocelot_reset_context {
> > +	struct regmap *chip_regs;
> > +	struct regmap *cpu_ctrl;
> > +	struct notifier_block restart_handler;
> > +};
> > +
> > +#define ICPU_CFG_CPU_SYSTEM_CTRL_RESET 0x20
> > +#define CORE_RST_PROTECT BIT(2)
> > +
> > +#define CHIP_REGS_SOFT_RST 0x8
> > +#define SOFT_CHIP_RST BIT(0)
> > +
> > +static int ocelot_restart_handle(struct notifier_block *this,
> > +				 unsigned long mode, void *cmd)
> > +{
> > +	struct ocelot_reset_context *ctx = container_of(this, struct
> > +							ocelot_reset_context,
> > +							restart_handler);
> > +
> > +	/* Make sure the core is not protected from reset */
> > +	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
> > +			   CORE_RST_PROTECT, 0);
> > +
> > +	regmap_write(ctx->chip_regs, CHIP_REGS_SOFT_RST, SOFT_CHIP_RST);
> > +
> > +	pr_emerg("Unable to restart system\n");
> > +	return NOTIFY_DONE;
> > +}
> > +
> > +static int ocelot_reset_probe(struct platform_device *pdev)
> > +{
> > +	struct ocelot_reset_context *ctx;
> > +	struct device *dev = &pdev->dev;
> > +	int err;
> > +
> > +	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
> > +	if (!ctx)
> > +		return -ENOMEM;
> > +
> > +	ctx->chip_regs = syscon_node_to_regmap(of_get_parent(dev->of_node));
> > +	if (IS_ERR(ctx->chip_regs))
> > +		return PTR_ERR(ctx->chip_regs);
> > +
> > +	ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
> > +	if (IS_ERR(ctx->cpu_ctrl))
> > +		return PTR_ERR(ctx->cpu_ctrl);
> > +
> > +	ctx->restart_handler.notifier_call = ocelot_restart_handle;
> > +	ctx->restart_handler.priority = 192;
> > +	err = register_restart_handler(&ctx->restart_handler);
> > +	if (err)
> > +		dev_err(dev, "can't register restart notifier (err=%d)\n", err);
> > +
> > +	return err;
> > +}
> > +
> > +static const struct of_device_id ocelot_reset_of_match[] = {
> > +	{ .compatible = "mscc,ocelot-chip-reset" },
> > +	{}
> > +};
> > +
> > +static struct platform_driver ocelot_reset_driver = {
> > +	.probe = ocelot_reset_probe,
> > +	.driver = {
> > +		.name = "ocelot-chip-reset",
> > +		.of_match_table = ocelot_reset_of_match,
> > +	},
> > +};
> > +builtin_platform_driver(ocelot_reset_driver);
> > -- 
> > 2.15.1
> > 



-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2 06/13] dt-bindings: mips: Add bindings for Microsemi SoCs

[Rob Herring]

On Fri, Dec 08, 2017 at 04:46:11PM +0100, Alexandre Belloni wrote:
> Add bindings for Microsemi SoCs. Currently only Ocelot is supported.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  Documentation/devicetree/bindings/mips/mscc.txt | 46 +++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mips/mscc.txt

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 04/13] dt-bindings: pinctrl: Add bindings for Microsemi Ocelot

[Linus Walleij]

On Fri, Dec 8, 2017 at 4:46 PM, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:

> Add the documentation for the Microsemi Ocelot pinmuxing and gpio
> controller.
>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: linux-gpio@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> Acked-by: Rob Herring <robh@kernel.org>

Patch applied.

Yours,
Linus Walleij

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Linus Walleij]

On Fri, Dec 8, 2017 at 4:46 PM, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:

> The Microsemi Ocelot SoC has a few pins that can be used as GPIOs or take
> multiple other functions. Add a driver for the pinmuxing and the GPIOs.
>
> There is currently no support for interrupts.
>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: linux-gpio@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

This looks very good. Nice work!

I was close to just applying it but found some very minor things.
When you resend this just send this patch and I can apply it directly
since there are only Kconfig symbol dependencies and no
compile-time dependencies in this patch.

> +config PINCTRL_OCELOT
> +       bool "Pinctrl driver for the Microsemi Ocelot SoCs"
> +       default y
> +       depends on OF
> +       depends on MSCC_OCELOT || COMPILE_TEST
> +       select GENERIC_PINCONF
> +       select GENERIC_PINCTRL_GROUPS
> +       select GENERIC_PINMUX_FUNCTIONS
> +       select REGMAP_MMIO

select GPIOLIB

When you run COMPILE_TEST you don't know if you have
GPIOLIB so select it.

> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)

Wow never saw that before. OK I guess.

> +#include <linux/compiler.h>
> +#include <linux/gpio.h>

Just:
#include <linux/gpio/driver.h>

<linux/gpio.h> is a legacy include and should not be used.

> +static int ocelot_pinmux_set_mux(struct pinctrl_dev *pctldev,
> +                                unsigned int selector, unsigned int group)
> +{
> +       struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +       struct ocelot_pin_caps *pin = ocelot_pins[group].drv_data;
> +       int f;
> +
> +       f = ocelot_pin_function_idx(group, selector);
> +       if (f < 0)
> +               return -EINVAL;
> +
> +       regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(pin->pin),
> +                          f << pin->pin);
> +       regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(pin->pin),
> +                          f << (pin->pin - 1));

You need to add some comment on what is happening here and how the
bits are used because just reading these two lines is pretty hard.

I guess f = 0, 1, 2 .... 31 or so.

pin->pin is also 0, 1, 2 ... 31?

BIT(pin->pin) is pretty self-evident. It is masking the bit controlling
this pin in each register.

But setting bits (f << (pin->pin)) and then in the other register
(f << (pin->pin -1))?

Maybe you should even add an illustrative dev_dbg() print here
showing which bits you mask and set, or use some helper bools
so it is crystal clear what is going on.

So there is two registers to select "alternative functions" (I guess?)
And each has one bit for the *same* pin.

This is the case also in drivers/pinctrl/nomadik/pinctrl-nomadik.c.
It turns out to be a pretty horrible design decision: since the two
bits are not changed in the same register transaction, switching
from say function "00" to function "11" creates a "glitch" where
you first activate funcion "10" after writing the first register,
then finally go to function "11" after writing the second.

This had horrible electrical consequences and required special
workarounds in Nomadik so be on the lookout for this type
of problem.

> +static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
> +                                    struct pinctrl_gpio_range *range,
> +                                    unsigned int pin, bool input)
> +{
> +       struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> +       regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
> +                          input ? BIT(pin) : 0);
> +
> +       return 0;
> +}
(...)
> +static const struct pinmux_ops ocelot_pmx_ops = {
> +       .get_functions_count = ocelot_get_functions_count,
> +       .get_function_name = ocelot_get_function_name,
> +       .get_function_groups = ocelot_get_function_groups,
> +       .set_mux = ocelot_pinmux_set_mux,
> +       .gpio_set_direction = ocelot_gpio_set_direction,
> +       .gpio_request_enable = ocelot_gpio_request_enable,
> +};

This looks a bit weird since the same register is also written
by the gpiochip to set direction.

If you want to relay the direction setting entirely to the pin
control subsystem, then just have your callbacks in the
gpiochip like this:

static int ocelot_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
        return pinctrl_gpio_direction_input(chip->base + offset);
}

static int ocelot_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
                                       int value)
{
       struct ocelot_pinctrl *info = gpiochip_get_data(chip);
       unsigned int pin = BIT(offset);

       if (value)
               regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
       else
               regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);

        return pinctrl_gpio_direction_output(chip->base + offset);
}

Then all direction setting will just be relayed to the pin control
side.

Shouldn't this call also set up the altfunction so you know
the pin is now set in GPIO mode? That is how some other
drivers do it at least. But maybe you prefer to do the
muxing "on the side" (using pinmux ops only, and explicitly
setting up the line as GPIO in e.g. the device tree)?

In that case I think you might not need this callback at all.

Also: are you should you do not need to disable OCELOT_GPIO_OE
in the .gpio_disable_free() callback?

> +static const struct pinctrl_ops ocelot_pctl_ops = {
> +       .get_groups_count = ocelot_pctl_get_groups_count,
> +       .get_group_name = ocelot_pctl_get_group_name,
> +       .get_group_pins = ocelot_pctl_get_group_pins,
> +       .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> +       .dt_free_map = pinconf_generic_dt_free_map,
> +};

Nice use of the generic parsers, thanks!

> +       ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
> +       if (ret)
> +               return ret;
> +       //TODO irqchip

/* Please use oldschool comments for now, the license on the top is
fine though */

> +static const struct regmap_config ocelot_pinctrl_regmap_config = {
> +       .reg_bits = 32,
> +       .val_bits = 32,
> +       .reg_stride = 4,
> +};

Looks like it could have some more limitations (like max register
and so on) but it's OK.

> +       base = devm_ioremap_resource(dev,
> +                       platform_get_resource(pdev, IORESOURCE_MEM, 0));
> +       if (IS_ERR(base)) {
> +               dev_err(dev, "Failed to ioremap registers\n");
> +               return PTR_ERR(base);
> +       }
> +
> +       info->map = devm_regmap_init_mmio(dev, base,
> +                                         &ocelot_pinctrl_regmap_config);
> +       if (IS_ERR(info->map)) {
> +               dev_err(dev, "Failed to create regmap\n");
> +               return PTR_ERR(info->map);
> +       }

Nice use of regmap MMIO!

Yours,
Linus Walleij

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Philippe Ombredanne]

On Wed, Dec 13, 2017 at 9:15 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
>
> Wow never saw that before. OK I guess.

That's the new thing. Less legalese boilerplate, and more code for the
better IMHO.

You can check the doc patches from Thomas for details [1]

[1] https://lkml.org/lkml/2017/12/4/934
-- 
Cordially
Philippe Ombredanne

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Linus Walleij]

On Wed, Dec 13, 2017 at 10:23 AM, Philippe Ombredanne
<pombredanne@nexb.com> wrote:
> On Wed, Dec 13, 2017 at 9:15 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
>>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>
>> Wow never saw that before. OK I guess.
>
> That's the new thing. Less legalese boilerplate, and more code for the
> better IMHO.
>
> You can check the doc patches from Thomas for details [1]
>
> [1] https://lkml.org/lkml/2017/12/4/934

Yeah I'm aware of this part, but I didn't see that combined license
before.

What is the reason for not just using GPL 2 here?

Yours,
Linus Walleij

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Philippe Ombredanne]

Alexandre, Linux

On Fri, Dec 15, 2017 at 12:53 AM, Linus Walleij
<linus.walleij@linaro.org> wrote:
> On Wed, Dec 13, 2017 at 10:23 AM, Philippe Ombredanne
> <pombredanne@nexb.com> wrote:
>> On Wed, Dec 13, 2017 at 9:15 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
>>>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>>
>>> Wow never saw that before. OK I guess.
>>
>> That's the new thing. Less legalese boilerplate, and more code for the
>> better IMHO.
>>
>> You can check the doc patches from Thomas for details [1]
>>
>> [1] https://lkml.org/lkml/2017/12/4/934
>
> Yeah I'm aware of this part, but I didn't see that combined license
> before.
>
> What is the reason for not just using GPL 2 here?

Linus,
That'a a question for Alexandre that submitted this patch in the first
place, not me.

Alexandre?

-- 
Cordially
Philippe Ombredanne

Re: [PATCH v2 07/13] dt-bindings: power: reset: Document ocelot-reset binding

[Rob Herring]

On Fri, Dec 08, 2017 at 04:46:12PM +0100, Alexandre Belloni wrote:
> Add binding documentation for the Microsemi Ocelot reset block.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  .../devicetree/bindings/power/reset/ocelot-reset.txt    | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> new file mode 100644
> index 000000000000..1bcf276b04cb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> @@ -0,0 +1,17 @@
> +Microsemi Ocelot reset controller
> +
> +The DEVCPU_GCB:CHIP_REGS have a SOFT_RST register that can be used to reset the
> +SoC MIPS core.
> +
> +Required Properties:
> + - compatible: "mscc,ocelot-chip-reset"
> +
> +Example:
> +	syscon@71070000 {
> +		compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
> +		reg = <0x71070000 0x1c>;
> +
> +		reset {
> +			compatible = "mscc,ocelot-chip-reset";

Why do you need a subnode here other than as a way to instantiate a 
driver? Can you describe the SOFT_RST register in reg property here 
(without having overlapping regions)?

Re: [PATCH v2 07/13] dt-bindings: power: reset: Document ocelot-reset binding

[Alexandre Belloni]

On 15/12/2017 at 14:23:32 -0600, Rob Herring wrote:
> On Fri, Dec 08, 2017 at 04:46:12PM +0100, Alexandre Belloni wrote:
> > Add binding documentation for the Microsemi Ocelot reset block.
> > 
> > Cc: Rob Herring <robh+dt@kernel.org>
> > Cc: devicetree@vger.kernel.org
> > Cc: Sebastian Reichel <sre@kernel.org>
> > Cc: linux-pm@vger.kernel.org
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> > ---
> >  .../devicetree/bindings/power/reset/ocelot-reset.txt    | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> > new file mode 100644
> > index 000000000000..1bcf276b04cb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> > @@ -0,0 +1,17 @@
> > +Microsemi Ocelot reset controller
> > +
> > +The DEVCPU_GCB:CHIP_REGS have a SOFT_RST register that can be used to reset the
> > +SoC MIPS core.
> > +
> > +Required Properties:
> > + - compatible: "mscc,ocelot-chip-reset"
> > +
> > +Example:
> > +	syscon@71070000 {
> > +		compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
> > +		reg = <0x71070000 0x1c>;
> > +
> > +		reset {
> > +			compatible = "mscc,ocelot-chip-reset";
> 
> Why do you need a subnode here other than as a way to instantiate a 
> driver? Can you describe the SOFT_RST register in reg property here 
> (without having overlapping regions)?

You mean like:

reset@7107001c {
	compatible = "mscc,ocelot-chip-reset";
	reg = <0x7107001c 0x4>;
};

I guess that could work.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2 00/13] MIPS: add support for the Microsemi MIPS SoCs

[PrasannaKumar Muralidharan]

Hi Alexandre,

With very small amount of code in arch/mips this series looks really nice.

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Hi,
>
> This patch series adds initial support for the Microsemi MIPS SoCs. It
> is currently focusing on the Microsemi Ocelot (VSC7513, VSC7514).
>
> It adds support for the IRQ controller, pinmux and gpio controller and
> reset control.
>
> This produces a kernel that can boot to the console.
>
> This is a single series for reference but it can also be taken
> separately by each maintainer as each drivers are independant.
>
> Changes in v2:
>  - removed the wildcard in MAINAINERS
>  - corrected the Cc list
>  - added proper documentation for both syscons
>  - removed the mscc,cpucontrol property
>  - updated the ranges property in the ocelot dtsi
>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: linux-gpio@vger.kernel.org
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: linux-pm@vger.kernel.org
>
>
> Alexandre Belloni (13):
>   dt-bindings: Add vendor prefix for Microsemi Corporation
>   dt-bindings: interrupt-controller: Add binding for the Microsemi
>     Ocelot interrupt controller
>   irqchip: Add a driver for the Microsemi Ocelot controller
>   dt-bindings: pinctrl: Add bindings for Microsemi Ocelot
>   pinctrl: Add Microsemi Ocelot SoC driver
>   dt-bindings: mips: Add bindings for Microsemi SoCs
>   dt-bindings: power: reset: Document ocelot-reset binding
>   power: reset: Add a driver for the Microsemi Ocelot reset
>   MIPS: mscc: Add initial support for Microsemi MIPS SoCs
>   MIPS: mscc: add ocelot dtsi
>   MIPS: mscc: add ocelot PCB123 device tree
>   MIPS: defconfigs: add a defconfig for Microsemi SoCs
>   MAINTAINERS: Add entry for Microsemi MIPS SoCs
>
>  .../interrupt-controller/mscc,ocelot-icpu-intr.txt |  22 +
>  Documentation/devicetree/bindings/mips/mscc.txt    |  46 ++
>  .../bindings/pinctrl/mscc,ocelot-pinctrl.txt       |  39 ++
>  .../bindings/power/reset/ocelot-reset.txt          |  17 +
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  MAINTAINERS                                        |   7 +
>  arch/mips/Kbuild.platforms                         |   1 +
>  arch/mips/Kconfig                                  |  24 +
>  arch/mips/boot/dts/Makefile                        |   1 +
>  arch/mips/boot/dts/mscc/Makefile                   |   6 +
>  arch/mips/boot/dts/mscc/ocelot.dtsi                | 115 +++++
>  arch/mips/boot/dts/mscc/ocelot_pcb123.dts          |  27 ++
>  arch/mips/configs/mscc_defconfig                   |  84 ++++
>  arch/mips/mscc/Makefile                            |  11 +
>  arch/mips/mscc/Platform                            |  12 +
>  arch/mips/mscc/setup.c                             | 106 +++++
>  drivers/irqchip/Kconfig                            |   5 +
>  drivers/irqchip/Makefile                           |   1 +
>  drivers/irqchip/irq-mscc-ocelot.c                  | 109 +++++
>  drivers/pinctrl/Kconfig                            |  10 +
>  drivers/pinctrl/Makefile                           |   1 +
>  drivers/pinctrl/pinctrl-ocelot.c                   | 505 +++++++++++++++++++++
>  drivers/power/reset/Kconfig                        |   7 +
>  drivers/power/reset/Makefile                       |   1 +
>  drivers/power/reset/ocelot-reset.c                 |  86 ++++
>  25 files changed, 1244 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mscc,ocelot-icpu-intr.txt
>  create mode 100644 Documentation/devicetree/bindings/mips/mscc.txt
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/mscc,ocelot-pinctrl.txt
>  create mode 100644 Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
>  create mode 100644 arch/mips/boot/dts/mscc/Makefile
>  create mode 100644 arch/mips/boot/dts/mscc/ocelot.dtsi
>  create mode 100644 arch/mips/boot/dts/mscc/ocelot_pcb123.dts
>  create mode 100644 arch/mips/configs/mscc_defconfig
>  create mode 100644 arch/mips/mscc/Makefile
>  create mode 100644 arch/mips/mscc/Platform
>  create mode 100644 arch/mips/mscc/setup.c
>  create mode 100644 drivers/irqchip/irq-mscc-ocelot.c
>  create mode 100644 drivers/pinctrl/pinctrl-ocelot.c
>  create mode 100644 drivers/power/reset/ocelot-reset.c
>
> --
> 2.15.1
>
>

Except for irqchip driver and pinctrl driver other parts of the series is
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>

Regards,
PrasannaKumar

Re: [PATCH v2 10/13] MIPS: mscc: add ocelot dtsi

[PrasannaKumar Muralidharan]

Hi Alexandre,

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Add a device tree include file for the Microsemi Ocelot SoC.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  arch/mips/boot/dts/Makefile         |   1 +
>  arch/mips/boot/dts/mscc/Makefile    |   4 ++
>  arch/mips/boot/dts/mscc/ocelot.dtsi | 115 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 120 insertions(+)
>  create mode 100644 arch/mips/boot/dts/mscc/Makefile
>  create mode 100644 arch/mips/boot/dts/mscc/ocelot.dtsi
>
> diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
> index e2c6f131c8eb..1e79cab8e269 100644
> --- a/arch/mips/boot/dts/Makefile
> +++ b/arch/mips/boot/dts/Makefile
> @@ -4,6 +4,7 @@ subdir-y        += cavium-octeon
>  subdir-y       += img
>  subdir-y       += ingenic
>  subdir-y       += lantiq
> +subdir-y       += mscc
>  subdir-y       += mti
>  subdir-y       += netlogic
>  subdir-y       += ni
> diff --git a/arch/mips/boot/dts/mscc/Makefile b/arch/mips/boot/dts/mscc/Makefile
> new file mode 100644
> index 000000000000..f0a155a74e02
> --- /dev/null
> +++ b/arch/mips/boot/dts/mscc/Makefile
> @@ -0,0 +1,4 @@
> +obj-y                          += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
> +
> +# Force kbuild to make empty built-in.o if necessary
> +obj-                           += dummy.o
> diff --git a/arch/mips/boot/dts/mscc/ocelot.dtsi b/arch/mips/boot/dts/mscc/ocelot.dtsi
> new file mode 100644
> index 000000000000..97f85431aa16
> --- /dev/null
> +++ b/arch/mips/boot/dts/mscc/ocelot.dtsi
> @@ -0,0 +1,115 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> +/* Copyright (c) 2017 Microsemi Corporation */
> +
> +/ {
> +       #address-cells = <1>;
> +       #size-cells = <1>;
> +       compatible = "mscc,ocelot";
> +
> +       cpus {
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +
> +               mips-hpt-frequency = <250000000>;
> +
> +               cpu@0 {
> +                       compatible = "mscc,ocelot";
> +                       device_type = "cpu";
> +                       reg = <0>;
> +               };
> +       };
> +
> +       aliases {
> +               serial0 = &uart0;
> +       };
> +
> +       cpuintc: interrupt-controller@0 {
> +               #address-cells = <0>;
> +               #interrupt-cells = <1>;
> +               interrupt-controller;
> +               compatible = "mti,cpu-interrupt-controller";
> +       };
> +
> +       ahb_clk: ahb-clk {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <250000000>;
> +       };
> +
> +       ahb {
> +               compatible = "simple-bus";
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges = <0 0x70000000 0x2000000>;
> +
> +               interrupt-parent = <&intc>;
> +
> +               cpu_ctrl: syscon@0 {
> +                       compatible = "mscc,ocelot-cpu-syscon", "syscon";
> +                       reg = <0x0 0x2c>;
> +               };
> +
> +               intc: interrupt-controller@70 {
> +                       compatible = "mscc,ocelot-icpu-intr";
> +                       reg = <0x70 0x70>;
> +                       #interrupt-cells = <1>;
> +                       interrupt-controller;
> +                       interrupt-parent = <&cpuintc>;
> +                       interrupts = <2>;
> +               };
> +
> +               uart0: serial@100000 {
> +                       pinctrl-0 = <&uart_pins>;
> +                       pinctrl-names = "default";
> +                       compatible = "ns16550a";
> +                       reg = <0x100000 0x20>;
> +                       interrupts = <6>;
> +                       clocks = <&ahb_clk>;
> +                       reg-io-width = <4>;
> +                       reg-shift = <2>;
> +
> +                       status = "disabled";
> +               };
> +
> +               uart2: serial@100800 {
> +                       pinctrl-0 = <&uart2_pins>;
> +                       pinctrl-names = "default";
> +                       compatible = "ns16550a";
> +                       reg = <0x100800 0x20>;
> +                       interrupts = <7>;
> +                       clocks = <&ahb_clk>;
> +                       reg-io-width = <4>;
> +                       reg-shift = <2>;
> +
> +                       status = "disabled";
> +               };
> +
> +               chip_regs: syscon@1070000 {
> +                       compatible = "mscc,ocelot-chip-regs", "simple-mfd", "syscon";
> +                       reg = <0x1070000 0x1c>;
> +
> +                       reset {
> +                               compatible = "mscc,ocelot-chip-reset";
> +                               mscc,cpucontrol = <&cpu_ctrl>;
> +                       };
> +               };
> +
> +               gpio: pinctrl@1070034 {
> +                       compatible = "mscc,ocelot-pinctrl";
> +                       reg = <0x1070034 0x28>;
> +                       gpio-controller;
> +                       #gpio-cells = <2>;
> +                       gpio-ranges = <&gpio 0 0 22>;
> +
> +                       uart_pins: uart-pins {
> +                               pins = "GPIO_6", "GPIO_7";
> +                               function = "uart";
> +                       };
> +
> +                       uart2_pins: uart2-pins {
> +                               pins = "GPIO_12", "GPIO_13";
> +                               function = "uart2";
> +                       };
> +               };
> +       };
> +};
> --
> 2.15.1
>
>

Looks good to me.
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>

Regards,
PrasannaKumar

Re: [PATCH v2 09/13] MIPS: mscc: Add initial support for Microsemi MIPS SoCs

[PrasannaKumar Muralidharan]

Hi Alexandre,

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Introduce support for the MIPS based Microsemi Ocelot SoCs.
> As the plan is to have all SoCs supported only using device tree, the
> mach directory is simply called mscc.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  arch/mips/Kbuild.platforms |   1 +
>  arch/mips/Kconfig          |  24 ++++++++++
>  arch/mips/mscc/Makefile    |  11 +++++
>  arch/mips/mscc/Platform    |  12 +++++
>  arch/mips/mscc/setup.c     | 106 +++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 154 insertions(+)
>  create mode 100644 arch/mips/mscc/Makefile
>  create mode 100644 arch/mips/mscc/Platform
>  create mode 100644 arch/mips/mscc/setup.c
>
> diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
> index ac7ad54f984f..b3b2f8dc91db 100644
> --- a/arch/mips/Kbuild.platforms
> +++ b/arch/mips/Kbuild.platforms
> @@ -18,6 +18,7 @@ platforms += lantiq
>  platforms += lasat
>  platforms += loongson32
>  platforms += loongson64
> +platforms += mscc
>  platforms += mti-malta
>  platforms += netlogic
>  platforms += paravirt
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 350a990fc719..a9db028a0338 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -527,6 +527,30 @@ config MIPS_MALTA
>           This enables support for the MIPS Technologies Malta evaluation
>           board.
>
> +config MSCC_OCELOT
> +       bool "Microsemi Ocelot architecture"
> +       select BOOT_RAW
> +       select CEVT_R4K
> +       select CSRC_R4K
> +       select IRQ_MIPS_CPU
> +       select DMA_NONCOHERENT
> +       select SYS_HAS_CPU_MIPS32_R2
> +       select SYS_SUPPORTS_32BIT_KERNEL
> +       select SYS_SUPPORTS_BIG_ENDIAN
> +       select SYS_SUPPORTS_LITTLE_ENDIAN
> +       select SYS_HAS_EARLY_PRINTK
> +       select USE_GENERIC_EARLY_PRINTK_8250
> +       select MSCC_OCELOT_IRQ
> +       select PINCTRL
> +       select GPIOLIB
> +       select COMMON_CLK
> +       select USE_OF
> +       select BUILTIN_DTB
> +       select LIBFDT
> +       help
> +         This enables support for the Microsemi Ocelot architecture.
> +         It builds a generic DT-based kernel image.
> +
>  config MACH_PIC32
>         bool "Microchip PIC32 Family"
>         help
> diff --git a/arch/mips/mscc/Makefile b/arch/mips/mscc/Makefile
> new file mode 100644
> index 000000000000..c96b13546730
> --- /dev/null
> +++ b/arch/mips/mscc/Makefile
> @@ -0,0 +1,11 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +#
> +# Microsemi MIPS SoC support
> +#
> +# License: Dual MIT/GPL
> +# Copyright (c) 2017 Microsemi Corporation
> +
> +#
> +# Makefile for the Microsemi MIPS SoCs
> +#
> +obj-y := setup.o
> diff --git a/arch/mips/mscc/Platform b/arch/mips/mscc/Platform
> new file mode 100644
> index 000000000000..9ae874c8f136
> --- /dev/null
> +++ b/arch/mips/mscc/Platform
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +#
> +# Microsemi MIPS SoC support
> +#
> +# License: Dual MIT/GPL
> +# Copyright (c) 2017 Microsemi Corporation
> +
> +#
> +# Microsemi Ocelot board(s)
> +#
> +platform-$(CONFIG_MSCC_OCELOT) += mscc/
> +load-$(CONFIG_MSCC_OCELOT)      += 0x80100000
> diff --git a/arch/mips/mscc/setup.c b/arch/mips/mscc/setup.c
> new file mode 100644
> index 000000000000..77803edd7bfd
> --- /dev/null
> +++ b/arch/mips/mscc/setup.c
> @@ -0,0 +1,106 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Microsemi MIPS SoC support
> + *
> + * License: Dual MIT/GPL
> + * Copyright (c) 2017 Microsemi Corporation
> + */
> +#include <linux/delay.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/libfdt.h>
> +#include <linux/of_fdt.h>
> +#include <linux/of_platform.h>
> +#include <linux/reboot.h>
> +
> +#include <asm/time.h>
> +#include <asm/idle.h>
> +#include <asm/prom.h>
> +#include <asm/reboot.h>
> +
> +static void __init ocelot_earlyprintk_init(void)
> +{
> +       void __iomem *uart_base;
> +
> +       uart_base = ioremap_nocache(0x70100000, 0x0f);
> +       setup_8250_early_printk_port((unsigned long)uart_base, 2, 50000);
> +}
> +
> +void __init prom_init(void)
> +{
> +       /* Sanity check for defunct bootloader */
> +       if (fw_arg0 < 10 && (fw_arg1 & 0xFFF00000) == 0x80000000) {
> +               unsigned int prom_argc = fw_arg0;
> +               const char **prom_argv = (const char **)fw_arg1;
> +
> +               if (prom_argc > 1 && strlen(prom_argv[1]) > 0)
> +                       /* ignore all built-in args if any f/w args given */
> +                       strcpy(arcs_cmdline, prom_argv[1]);
> +       }
> +}
> +
> +void __init prom_free_prom_memory(void)
> +{
> +}
> +
> +unsigned int get_c0_compare_int(void)
> +{
> +       return CP0_LEGACY_COMPARE_IRQ;
> +}
> +
> +void __init plat_time_init(void)
> +{
> +       struct device_node *np;
> +       u32 freq;
> +
> +       np = of_find_node_by_name(NULL, "cpus");
> +       if (!np)
> +               panic("missing 'cpus' DT node");
> +       if (of_property_read_u32(np, "mips-hpt-frequency", &freq) < 0)
> +               panic("missing 'mips-hpt-frequency' property");
> +       of_node_put(np);
> +
> +       mips_hpt_frequency = freq;
> +}
> +
> +void __init arch_init_irq(void)
> +{
> +       irqchip_init();
> +}
> +
> +const char *get_system_type(void)
> +{
> +       return "Microsemi Ocelot";
> +}
> +
> +static void __init ocelot_late_init(void)
> +{
> +       ocelot_earlyprintk_init();
> +}
> +
> +extern void (*late_time_init)(void);
> +
> +void __init plat_mem_setup(void)
> +{
> +       /* This has to be done so late because ioremap needs to work */
> +       late_time_init = ocelot_late_init;
> +
> +       __dt_setup_arch(__dtb_start);
> +}
> +
> +void __init device_tree_init(void)
> +{
> +       if (!initial_boot_params)
> +               return;
> +
> +       unflatten_and_copy_device_tree();
> +}
> +
> +static int __init populate_machine(void)
> +{
> +       of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> +       return 0;
> +}
> +arch_initcall(populate_machine);
> --
> 2.15.1
>
>

Looks good to me.
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>

Regards,
PrasannaKumar

Re: [PATCH v2 08/13] power: reset: Add a driver for the Microsemi Ocelot reset

[PrasannaKumar Muralidharan]

Hi Alexandre,

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> The Microsemi Ocelot SoC has a register allowing to reset the MIPS core.
> Unfortunately, the syscon-reboot driver can't be used directly (but almost)
> as the reset control may be disabled using another register.
>
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  drivers/power/reset/Kconfig        |  7 ++++
>  drivers/power/reset/Makefile       |  1 +
>  drivers/power/reset/ocelot-reset.c | 86 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 94 insertions(+)
>  create mode 100644 drivers/power/reset/ocelot-reset.c
>
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index ca0de1a78e85..2372f8e1040d 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -113,6 +113,13 @@ config POWER_RESET_MSM
>         help
>           Power off and restart support for Qualcomm boards.
>
> +config POWER_RESET_OCELOT_RESET
> +       bool "Microsemi Ocelot reset driver"
> +       depends on MSCC_OCELOT || COMPILE_TEST
> +       select MFD_SYSCON
> +       help
> +         This driver supports restart for Microsemi Ocelot SoC.
> +
>  config POWER_RESET_PIIX4_POWEROFF
>         tristate "Intel PIIX4 power-off driver"
>         depends on PCI
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index aeb65edb17b7..df9d92291c67 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
>  obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
>  obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
>  obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
> +obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
>  obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
>  obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
>  obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
> diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
> new file mode 100644
> index 000000000000..1fb14bf17191
> --- /dev/null
> +++ b/drivers/power/reset/ocelot-reset.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Microsemi MIPS SoC reset driver
> + *
> + * License: Dual MIT/GPL
> + * Copyright (c) 2017 Microsemi Corporation
> + */
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/notifier.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +#include <linux/regmap.h>
> +
> +struct ocelot_reset_context {
> +       struct regmap *chip_regs;
> +       struct regmap *cpu_ctrl;
> +       struct notifier_block restart_handler;
> +};
> +
> +#define ICPU_CFG_CPU_SYSTEM_CTRL_RESET 0x20
> +#define CORE_RST_PROTECT BIT(2)
> +
> +#define CHIP_REGS_SOFT_RST 0x8
> +#define SOFT_CHIP_RST BIT(0)
> +
> +static int ocelot_restart_handle(struct notifier_block *this,
> +                                unsigned long mode, void *cmd)
> +{
> +       struct ocelot_reset_context *ctx = container_of(this, struct
> +                                                       ocelot_reset_context,
> +                                                       restart_handler);
> +
> +       /* Make sure the core is not protected from reset */
> +       regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
> +                          CORE_RST_PROTECT, 0);
> +
> +       regmap_write(ctx->chip_regs, CHIP_REGS_SOFT_RST, SOFT_CHIP_RST);
> +
> +       pr_emerg("Unable to restart system\n");
> +       return NOTIFY_DONE;
> +}
> +
> +static int ocelot_reset_probe(struct platform_device *pdev)
> +{
> +       struct ocelot_reset_context *ctx;
> +       struct device *dev = &pdev->dev;
> +       int err;
> +
> +       ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
> +       if (!ctx)
> +               return -ENOMEM;
> +
> +       ctx->chip_regs = syscon_node_to_regmap(of_get_parent(dev->of_node));
> +       if (IS_ERR(ctx->chip_regs))
> +               return PTR_ERR(ctx->chip_regs);
> +
> +       ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
> +       if (IS_ERR(ctx->cpu_ctrl))
> +               return PTR_ERR(ctx->cpu_ctrl);
> +
> +       ctx->restart_handler.notifier_call = ocelot_restart_handle;
> +       ctx->restart_handler.priority = 192;
> +       err = register_restart_handler(&ctx->restart_handler);
> +       if (err)
> +               dev_err(dev, "can't register restart notifier (err=%d)\n", err);
> +
> +       return err;
> +}
> +
> +static const struct of_device_id ocelot_reset_of_match[] = {
> +       { .compatible = "mscc,ocelot-chip-reset" },
> +       {}
> +};
> +
> +static struct platform_driver ocelot_reset_driver = {
> +       .probe = ocelot_reset_probe,
> +       .driver = {
> +               .name = "ocelot-chip-reset",
> +               .of_match_table = ocelot_reset_of_match,
> +       },
> +};
> +builtin_platform_driver(ocelot_reset_driver);
> --
> 2.15.1
>
>

Looks good to me.
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>

Regards,
PrasannaKumar

Re: [PATCH v2 11/13] MIPS: mscc: add ocelot PCB123 device tree

[PrasannaKumar Muralidharan]

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Add a device tree for the Microsemi Ocelot PCB123 evaluation board.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  arch/mips/boot/dts/mscc/Makefile          |  2 ++
>  arch/mips/boot/dts/mscc/ocelot_pcb123.dts | 27 +++++++++++++++++++++++++++
>  2 files changed, 29 insertions(+)
>  create mode 100644 arch/mips/boot/dts/mscc/ocelot_pcb123.dts
>
> diff --git a/arch/mips/boot/dts/mscc/Makefile b/arch/mips/boot/dts/mscc/Makefile
> index f0a155a74e02..09a1c4b97de2 100644
> --- a/arch/mips/boot/dts/mscc/Makefile
> +++ b/arch/mips/boot/dts/mscc/Makefile
> @@ -1,3 +1,5 @@
> +dtb-$(CONFIG_MSCC_OCELOT)      += ocelot_pcb123.dtb
> +
>  obj-y                          += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
>
>  # Force kbuild to make empty built-in.o if necessary
> diff --git a/arch/mips/boot/dts/mscc/ocelot_pcb123.dts b/arch/mips/boot/dts/mscc/ocelot_pcb123.dts
> new file mode 100644
> index 000000000000..42bd404471f6
> --- /dev/null
> +++ b/arch/mips/boot/dts/mscc/ocelot_pcb123.dts
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> +/* Copyright (c) 2017 Microsemi Corporation */
> +
> +/dts-v1/;
> +
> +#include "ocelot.dtsi"
> +
> +/ {
> +       compatible = "mscc,ocelot-pcb123", "mscc,ocelot";
> +
> +       chosen {
> +               stdout-path = "serial0:115200n8";
> +       };
> +
> +       memory {
> +               device_type = "memory";
> +               reg = <0x0 0x0e000000>;
> +       };
> +};
> +
> +&uart0 {
> +       status = "okay";
> +};
> +
> +&uart2 {
> +       status = "okay";
> +};
> --
> 2.15.1
>
>

Looks good to me.
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>

Regards,
PrasannaKumar

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Alexandre Belloni]

On 15/12/2017 at 08:59:15 +0100, Philippe Ombredanne wrote:
> Alexandre, Linux
> 
> On Fri, Dec 15, 2017 at 12:53 AM, Linus Walleij
> <linus.walleij@linaro.org> wrote:
> > On Wed, Dec 13, 2017 at 10:23 AM, Philippe Ombredanne
> > <pombredanne@nexb.com> wrote:
> >> On Wed, Dec 13, 2017 at 9:15 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> >>>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> >>>
> >>> Wow never saw that before. OK I guess.
> >>
> >> That's the new thing. Less legalese boilerplate, and more code for the
> >> better IMHO.
> >>
> >> You can check the doc patches from Thomas for details [1]
> >>
> >> [1] https://lkml.org/lkml/2017/12/4/934
> >
> > Yeah I'm aware of this part, but I didn't see that combined license
> > before.
> >
> > What is the reason for not just using GPL 2 here?
> 
> Linus,
> That'a a question for Alexandre that submitted this patch in the first
> place, not me.
> 
> Alexandre?
> 

I'm not the one taking that decision and I don't think this choice has a
particular issue (we use the same one for device trees).

I guess the idea behind it is to be able to reuse the same code in other
non-GPL projects.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2 09/13] MIPS: mscc: Add initial support for Microsemi MIPS SoCs

[PrasannaKumar Muralidharan]

Hi Alexandre,

On 8 December 2017 at 21:16, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Introduce support for the MIPS based Microsemi Ocelot SoCs.
> As the plan is to have all SoCs supported only using device tree, the
> mach directory is simply called mscc.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  arch/mips/Kbuild.platforms |   1 +
>  arch/mips/Kconfig          |  24 ++++++++++
>  arch/mips/mscc/Makefile    |  11 +++++
>  arch/mips/mscc/Platform    |  12 +++++
>  arch/mips/mscc/setup.c     | 106 +++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 154 insertions(+)
>  create mode 100644 arch/mips/mscc/Makefile
>  create mode 100644 arch/mips/mscc/Platform
>  create mode 100644 arch/mips/mscc/setup.c
>
> diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
> index ac7ad54f984f..b3b2f8dc91db 100644
> --- a/arch/mips/Kbuild.platforms
> +++ b/arch/mips/Kbuild.platforms
> @@ -18,6 +18,7 @@ platforms += lantiq
>  platforms += lasat
>  platforms += loongson32
>  platforms += loongson64
> +platforms += mscc
>  platforms += mti-malta
>  platforms += netlogic
>  platforms += paravirt
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 350a990fc719..a9db028a0338 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -527,6 +527,30 @@ config MIPS_MALTA
>           This enables support for the MIPS Technologies Malta evaluation
>           board.
>
> +config MSCC_OCELOT
> +       bool "Microsemi Ocelot architecture"
> +       select BOOT_RAW
> +       select CEVT_R4K
> +       select CSRC_R4K
> +       select IRQ_MIPS_CPU
> +       select DMA_NONCOHERENT
> +       select SYS_HAS_CPU_MIPS32_R2
> +       select SYS_SUPPORTS_32BIT_KERNEL
> +       select SYS_SUPPORTS_BIG_ENDIAN
> +       select SYS_SUPPORTS_LITTLE_ENDIAN
> +       select SYS_HAS_EARLY_PRINTK
> +       select USE_GENERIC_EARLY_PRINTK_8250
> +       select MSCC_OCELOT_IRQ
> +       select PINCTRL
> +       select GPIOLIB
> +       select COMMON_CLK
> +       select USE_OF
> +       select BUILTIN_DTB
> +       select LIBFDT
> +       help
> +         This enables support for the Microsemi Ocelot architecture.
> +         It builds a generic DT-based kernel image.
> +
>  config MACH_PIC32
>         bool "Microchip PIC32 Family"
>         help
> diff --git a/arch/mips/mscc/Makefile b/arch/mips/mscc/Makefile
> new file mode 100644
> index 000000000000..c96b13546730
> --- /dev/null
> +++ b/arch/mips/mscc/Makefile
> @@ -0,0 +1,11 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +#
> +# Microsemi MIPS SoC support
> +#
> +# License: Dual MIT/GPL
> +# Copyright (c) 2017 Microsemi Corporation
> +
> +#
> +# Makefile for the Microsemi MIPS SoCs
> +#
> +obj-y := setup.o
> diff --git a/arch/mips/mscc/Platform b/arch/mips/mscc/Platform
> new file mode 100644
> index 000000000000..9ae874c8f136
> --- /dev/null
> +++ b/arch/mips/mscc/Platform
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +#
> +# Microsemi MIPS SoC support
> +#
> +# License: Dual MIT/GPL
> +# Copyright (c) 2017 Microsemi Corporation
> +
> +#
> +# Microsemi Ocelot board(s)
> +#
> +platform-$(CONFIG_MSCC_OCELOT) += mscc/
> +load-$(CONFIG_MSCC_OCELOT)      += 0x80100000
> diff --git a/arch/mips/mscc/setup.c b/arch/mips/mscc/setup.c
> new file mode 100644
> index 000000000000..77803edd7bfd
> --- /dev/null
> +++ b/arch/mips/mscc/setup.c
> @@ -0,0 +1,106 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Microsemi MIPS SoC support
> + *
> + * License: Dual MIT/GPL
> + * Copyright (c) 2017 Microsemi Corporation
> + */
> +#include <linux/delay.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/libfdt.h>
> +#include <linux/of_fdt.h>
> +#include <linux/of_platform.h>
> +#include <linux/reboot.h>
> +
> +#include <asm/time.h>
> +#include <asm/idle.h>
> +#include <asm/prom.h>
> +#include <asm/reboot.h>
> +
> +static void __init ocelot_earlyprintk_init(void)
> +{
> +       void __iomem *uart_base;
> +
> +       uart_base = ioremap_nocache(0x70100000, 0x0f);
> +       setup_8250_early_printk_port((unsigned long)uart_base, 2, 50000);
> +}
> +
> +void __init prom_init(void)
> +{
> +       /* Sanity check for defunct bootloader */
> +       if (fw_arg0 < 10 && (fw_arg1 & 0xFFF00000) == 0x80000000) {
> +               unsigned int prom_argc = fw_arg0;
> +               const char **prom_argv = (const char **)fw_arg1;
> +
> +               if (prom_argc > 1 && strlen(prom_argv[1]) > 0)
> +                       /* ignore all built-in args if any f/w args given */
> +                       strcpy(arcs_cmdline, prom_argv[1]);
> +       }
> +}
> +
> +void __init prom_free_prom_memory(void)
> +{
> +}
> +
> +unsigned int get_c0_compare_int(void)
> +{
> +       return CP0_LEGACY_COMPARE_IRQ;
> +}
> +
> +void __init plat_time_init(void)
> +{
> +       struct device_node *np;
> +       u32 freq;
> +
> +       np = of_find_node_by_name(NULL, "cpus");
> +       if (!np)
> +               panic("missing 'cpus' DT node");
> +       if (of_property_read_u32(np, "mips-hpt-frequency", &freq) < 0)
> +               panic("missing 'mips-hpt-frequency' property");
> +       of_node_put(np);
> +
> +       mips_hpt_frequency = freq;
> +}
> +
> +void __init arch_init_irq(void)
> +{
> +       irqchip_init();
> +}
> +
> +const char *get_system_type(void)
> +{
> +       return "Microsemi Ocelot";
> +}
> +
> +static void __init ocelot_late_init(void)
> +{
> +       ocelot_earlyprintk_init();
> +}
> +
> +extern void (*late_time_init)(void);
> +
> +void __init plat_mem_setup(void)
> +{
> +       /* This has to be done so late because ioremap needs to work */
> +       late_time_init = ocelot_late_init;
> +
> +       __dt_setup_arch(__dtb_start);
> +}
> +
> +void __init device_tree_init(void)
> +{
> +       if (!initial_boot_params)
> +               return;
> +
> +       unflatten_and_copy_device_tree();
> +}
> +
> +static int __init populate_machine(void)
> +{
> +       of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> +       return 0;
> +}
> +arch_initcall(populate_machine);
> --
> 2.15.1
>
>

Given the fact that setup code is very small and most of it is generic
code I strongly believe that it is plausible to make use of generic
code completely. Please have a look at [1] and [2].

1. https://patchwork.kernel.org/patch/9655699/
2. https://patchwork.kernel.org/patch/9655697/

PS: My rb tag stays if this could not be done immediately.

Regards,
PrasannaKumar Muralidharan

Re: [PATCH v2 09/13] MIPS: mscc: Add initial support for Microsemi MIPS SoCs

[Alexandre Belloni]

Hi,

On 19/12/2017 at 20:27:02 +0530, PrasannaKumar Muralidharan wrote:
> Given the fact that setup code is very small and most of it is generic
> code I strongly believe that it is plausible to make use of generic
> code completely. Please have a look at [1] and [2].
> 
> 1. https://patchwork.kernel.org/patch/9655699/
> 2. https://patchwork.kernel.org/patch/9655697/
> 
> PS: My rb tag stays if this could not be done immediately.
> 

I think we had that discussion on the previous version:
https://www.linux-mips.org/archives/linux-mips/2017-11/msg00532.html

I can't test on the sead3 so I'd prefer not changing its code right now.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2 09/13] MIPS: mscc: Add initial support for Microsemi MIPS SoCs

[PrasannaKumar Muralidharan]

Hi Alexandre,

On 20 December 2017 at 01:39, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:
> Hi,
>
> On 19/12/2017 at 20:27:02 +0530, PrasannaKumar Muralidharan wrote:
>> Given the fact that setup code is very small and most of it is generic
>> code I strongly believe that it is plausible to make use of generic
>> code completely. Please have a look at [1] and [2].
>>
>> 1. https://patchwork.kernel.org/patch/9655699/
>> 2. https://patchwork.kernel.org/patch/9655697/
>>
>> PS: My rb tag stays if this could not be done immediately.
>>
>
> I think we had that discussion on the previous version:
> https://www.linux-mips.org/archives/linux-mips/2017-11/msg00532.html
>
> I can't test on the sead3 so I'd prefer not changing its code right now.
>
> --
> Alexandre Belloni, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com

Sorry I missed it. Your v1 did not show up in my mailbox somehow even
though I am subscribed to linux-mips mailing list. Hope generic code
can be used in future.

Regards,
PrasannaKumar

Re: [PATCH v2 05/13] pinctrl: Add Microsemi Ocelot SoC driver

[Alexandre Belloni]

On 13/12/2017 at 09:15:20 +0100, Linus Walleij wrote:
> You need to add some comment on what is happening here and how the
> bits are used because just reading these two lines is pretty hard.
> 
> I guess f = 0, 1, 2 .... 31 or so.
> 
> pin->pin is also 0, 1, 2 ... 31?
> 
> BIT(pin->pin) is pretty self-evident. It is masking the bit controlling
> this pin in each register.
> 
> But setting bits (f << (pin->pin)) and then in the other register
> (f << (pin->pin -1))?
> 

I've added a comment. f can take 4 values, that is 2 bits. bit 0 goes to
bit(pin) of ALT0 and bit 1 goes to bit(pin) of ALT1

> Maybe you should even add an illustrative dev_dbg() print here
> showing which bits you mask and set, or use some helper bools
> so it is crystal clear what is going on.
> 
> So there is two registers to select "alternative functions" (I guess?)
> And each has one bit for the *same* pin.
> 

That is correct.

> This is the case also in drivers/pinctrl/nomadik/pinctrl-nomadik.c.
> It turns out to be a pretty horrible design decision: since the two
> bits are not changed in the same register transaction, switching
> from say function "00" to function "11" creates a "glitch" where
> you first activate funcion "10" after writing the first register,
> then finally go to function "11" after writing the second.
> 
> This had horrible electrical consequences and required special
> workarounds in Nomadik so be on the lookout for this type
> of problem.
> 

Yes, it is definitively racy. I've added that in the comment but I don't
expect that to cause any real issue soon. But I'll keep that in mind.

> > +static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
> > +                                    struct pinctrl_gpio_range *range,
> > +                                    unsigned int pin, bool input)
> > +{
> > +       struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> > +
> > +       regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
> > +                          input ? BIT(pin) : 0);
> > +
> > +       return 0;
> > +}
> (...)
> > +static const struct pinmux_ops ocelot_pmx_ops = {
> > +       .get_functions_count = ocelot_get_functions_count,
> > +       .get_function_name = ocelot_get_function_name,
> > +       .get_function_groups = ocelot_get_function_groups,
> > +       .set_mux = ocelot_pinmux_set_mux,
> > +       .gpio_set_direction = ocelot_gpio_set_direction,
> > +       .gpio_request_enable = ocelot_gpio_request_enable,
> > +};
> 
> This looks a bit weird since the same register is also written
> by the gpiochip to set direction.
> 
> If you want to relay the direction setting entirely to the pin
> control subsystem, then just have your callbacks in the
> gpiochip like this:
> 
> static int ocelot_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> {
>         return pinctrl_gpio_direction_input(chip->base + offset);
> }
> 
> static int ocelot_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
>                                        int value)
> {
>        struct ocelot_pinctrl *info = gpiochip_get_data(chip);
>        unsigned int pin = BIT(offset);
> 
>        if (value)
>                regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
>        else
>                regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);
> 
>         return pinctrl_gpio_direction_output(chip->base + offset);
> }
> 
> Then all direction setting will just be relayed to the pin control
> side.
> 
> Shouldn't this call also set up the altfunction so you know
> the pin is now set in GPIO mode? That is how some other
> drivers do it at least. But maybe you prefer to do the
> muxing "on the side" (using pinmux ops only, and explicitly
> setting up the line as GPIO in e.g. the device tree)?
> 

Yes, my plan was to have an explicit muxing to GPIO in the device tree.

> In that case I think you might not need this callback at all.
> 
> Also: are you should you do not need to disable OCELOT_GPIO_OE
> in the .gpio_disable_free() callback?
> 

OCELOT_GPIO_OE doesn't matter if the pin is not muxed to GPIO.

I must admit I only tested the GPIO functionnality using /sys/class/gpio
as I only have one GPIO available on my board.

I'm sending v3 now.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v3] pinctrl: Add Microsemi Ocelot SoC driver

[Alexandre Belloni]

The Microsemi Ocelot SoC has a few pins that can be used as GPIOs or take
multiple other functions. Add a driver for the pinmuxing and the GPIOs.

There is currently no support for interrupts.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 - use  pinctrl_gpio_direction_input/output from
   ocelot_gpio_direction_input/output
 - add a comment for ALT0/ALT1
 - fill .max_register of ocelot_pinctrl_regmap_config

 drivers/pinctrl/Kconfig          |  11 +
 drivers/pinctrl/Makefile         |   1 +
 drivers/pinctrl/pinctrl-ocelot.c | 511 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 523 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-ocelot.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 4571cc098b76..640fb829935a 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -343,6 +343,17 @@ config PINCTRL_RK805
 	help
 	  This selects the pinctrl driver for RK805.
 
+config PINCTRL_OCELOT
+	bool "Pinctrl driver for the Microsemi Ocelot SoCs"
+	default y
+	depends on OF
+	depends on MSCC_OCELOT || COMPILE_TEST
+	select GPIOLIB
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select REGMAP_MMIO
+
 source "drivers/pinctrl/aspeed/Kconfig"
 source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index d0d4844f8022..b1cae074a949 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 obj-$(CONFIG_PINCTRL_ZYNQ)	+= pinctrl-zynq.o
 obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
 obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
+obj-$(CONFIG_PINCTRL_OCELOT)	+= pinctrl-ocelot.o
 
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
 obj-y				+= bcm/
diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
new file mode 100644
index 000000000000..01a50d969111
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -0,0 +1,511 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi SoCs pinctrl driver
+ *
+ * Author: <alexandre.belloni@free-electrons.com>
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinmux.h"
+
+#define OCELOT_GPIO_OUT_SET	0x0
+#define OCELOT_GPIO_OUT_CLR	0x4
+#define OCELOT_GPIO_OUT		0x8
+#define OCELOT_GPIO_IN		0xc
+#define OCELOT_GPIO_OE		0x10
+#define OCELOT_GPIO_INTR	0x14
+#define OCELOT_GPIO_INTR_ENA	0x18
+#define OCELOT_GPIO_INTR_IDENT	0x1c
+#define OCELOT_GPIO_ALT0	0x20
+#define OCELOT_GPIO_ALT1	0x24
+#define OCELOT_GPIO_SD_MAP	0x28
+
+#define OCELOT_PINS		22
+#define OCELOT_FUNC_PER_PIN	4
+
+enum {
+	FUNC_NONE,
+	FUNC_GPIO,
+	FUNC_IRQ0_IN,
+	FUNC_IRQ0_OUT,
+	FUNC_IRQ1_IN,
+	FUNC_IRQ1_OUT,
+	FUNC_MIIM1,
+	FUNC_PCI_WAKE,
+	FUNC_PTP0,
+	FUNC_PTP1,
+	FUNC_PTP2,
+	FUNC_PTP3,
+	FUNC_PWM,
+	FUNC_RECO_CLK0,
+	FUNC_RECO_CLK1,
+	FUNC_SFP0,
+	FUNC_SFP1,
+	FUNC_SFP2,
+	FUNC_SFP3,
+	FUNC_SFP4,
+	FUNC_SFP5,
+	FUNC_SG0,
+	FUNC_SI,
+	FUNC_TACHO,
+	FUNC_TWI,
+	FUNC_TWI_SCL_M,
+	FUNC_UART,
+	FUNC_UART2,
+	FUNC_MAX
+};
+
+static const char *const ocelot_function_names[] = {
+	[FUNC_NONE]		= "none",
+	[FUNC_GPIO]		= "gpio",
+	[FUNC_IRQ0_IN]		= "irq0_in",
+	[FUNC_IRQ0_OUT]		= "irq0_out",
+	[FUNC_IRQ1_IN]		= "irq1_in",
+	[FUNC_IRQ1_OUT]		= "irq1_out",
+	[FUNC_MIIM1]		= "miim1",
+	[FUNC_PCI_WAKE]		= "pci_wake",
+	[FUNC_PTP0]		= "ptp0",
+	[FUNC_PTP1]		= "ptp1",
+	[FUNC_PTP2]		= "ptp2",
+	[FUNC_PTP3]		= "ptp3",
+	[FUNC_PWM]		= "pwm",
+	[FUNC_RECO_CLK0]	= "reco_clk0",
+	[FUNC_RECO_CLK1]	= "reco_clk1",
+	[FUNC_SFP0]		= "sfp0",
+	[FUNC_SFP1]		= "sfp1",
+	[FUNC_SFP2]		= "sfp2",
+	[FUNC_SFP3]		= "sfp3",
+	[FUNC_SFP4]		= "sfp4",
+	[FUNC_SFP5]		= "sfp5",
+	[FUNC_SG0]		= "sg0",
+	[FUNC_SI]		= "si",
+	[FUNC_TACHO]		= "tacho",
+	[FUNC_TWI]		= "twi",
+	[FUNC_TWI_SCL_M]	= "twi_scl_m",
+	[FUNC_UART]		= "uart",
+	[FUNC_UART2]		= "uart2",
+};
+
+struct ocelot_pmx_func {
+	const char **groups;
+	unsigned int ngroups;
+};
+
+struct ocelot_pin_caps {
+	unsigned int pin;
+	unsigned char functions[OCELOT_FUNC_PER_PIN];
+};
+
+struct ocelot_pinctrl {
+	struct device *dev;
+	struct pinctrl_dev *pctl;
+	struct gpio_chip gpio_chip;
+	struct regmap *map;
+	struct ocelot_pmx_func func[FUNC_MAX];
+};
+
+#define OCELOT_P(p, f0, f1, f2)						\
+static struct ocelot_pin_caps ocelot_pin_##p = {			\
+	.pin = p,							\
+	.functions = {							\
+			FUNC_GPIO, FUNC_##f0, FUNC_##f1, FUNC_##f2,	\
+	},								\
+}
+
+OCELOT_P(0,  SG0,       NONE,      NONE);
+OCELOT_P(1,  SG0,       NONE,      NONE);
+OCELOT_P(2,  SG0,       NONE,      NONE);
+OCELOT_P(3,  SG0,       NONE,      NONE);
+OCELOT_P(4,  IRQ0_IN,   IRQ0_OUT,  TWI);
+OCELOT_P(5,  IRQ1_IN,   IRQ1_OUT,  PCI_WAKE);
+OCELOT_P(6,  UART,      TWI_SCL_M, NONE);
+OCELOT_P(7,  UART,      TWI_SCL_M, NONE);
+OCELOT_P(8,  SI,        TWI_SCL_M, IRQ0_OUT);
+OCELOT_P(9,  SI,        TWI_SCL_M, IRQ1_OUT);
+OCELOT_P(10, PTP2,      TWI_SCL_M, SFP0);
+OCELOT_P(11, PTP3,      TWI_SCL_M, SFP1);
+OCELOT_P(12, UART2,     TWI_SCL_M, SFP2);
+OCELOT_P(13, UART2,     TWI_SCL_M, SFP3);
+OCELOT_P(14, MIIM1,     TWI_SCL_M, SFP4);
+OCELOT_P(15, MIIM1,     TWI_SCL_M, SFP5);
+OCELOT_P(16, TWI,       NONE,      SI);
+OCELOT_P(17, TWI,       TWI_SCL_M, SI);
+OCELOT_P(18, PTP0,      TWI_SCL_M, NONE);
+OCELOT_P(19, PTP1,      TWI_SCL_M, NONE);
+OCELOT_P(20, RECO_CLK0, TACHO,     NONE);
+OCELOT_P(21, RECO_CLK1, PWM,       NONE);
+
+#define OCELOT_PIN(n) {						\
+	.number = n,						\
+	.name = "GPIO_"#n,					\
+	.drv_data = &ocelot_pin_##n				\
+}
+
+static const struct pinctrl_pin_desc ocelot_pins[] = {
+	OCELOT_PIN(0),
+	OCELOT_PIN(1),
+	OCELOT_PIN(2),
+	OCELOT_PIN(3),
+	OCELOT_PIN(4),
+	OCELOT_PIN(5),
+	OCELOT_PIN(6),
+	OCELOT_PIN(7),
+	OCELOT_PIN(8),
+	OCELOT_PIN(9),
+	OCELOT_PIN(10),
+	OCELOT_PIN(11),
+	OCELOT_PIN(12),
+	OCELOT_PIN(13),
+	OCELOT_PIN(14),
+	OCELOT_PIN(15),
+	OCELOT_PIN(16),
+	OCELOT_PIN(17),
+	OCELOT_PIN(18),
+	OCELOT_PIN(19),
+	OCELOT_PIN(20),
+	OCELOT_PIN(21),
+};
+
+static int ocelot_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(ocelot_function_names);
+}
+
+static const char *ocelot_get_function_name(struct pinctrl_dev *pctldev,
+					    unsigned int function)
+{
+	return ocelot_function_names[function];
+}
+
+static int ocelot_get_function_groups(struct pinctrl_dev *pctldev,
+				      unsigned int function,
+				      const char *const **groups,
+				      unsigned *const num_groups)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups  = info->func[function].groups;
+	*num_groups = info->func[function].ngroups;
+
+	return 0;
+}
+
+static int ocelot_pin_function_idx(unsigned int pin, unsigned int function)
+{
+	struct ocelot_pin_caps *p = ocelot_pins[pin].drv_data;
+	int i;
+
+	for (i = 0; i < OCELOT_FUNC_PER_PIN; i++) {
+		if (function == p->functions[i])
+			return i;
+	}
+
+	return -1;
+}
+
+static int ocelot_pinmux_set_mux(struct pinctrl_dev *pctldev,
+				 unsigned int selector, unsigned int group)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct ocelot_pin_caps *pin = ocelot_pins[group].drv_data;
+	int f;
+
+	f = ocelot_pin_function_idx(group, selector);
+	if (f < 0)
+		return -EINVAL;
+
+	/*
+	 * f is encoded on two bits.
+	 * bit 0 of f goes in BIT(pin) of ALT0, bit 1 of f goes in BIT(pin) of
+	 * ALT1
+	 * This is racy because both registers can't be updated at the same time
+	 * but it doesn't matter much for now.
+	 */
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(pin->pin),
+			   f << pin->pin);
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(pin->pin),
+			   f << (pin->pin - 1));
+
+	return 0;
+}
+
+static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned int pin, bool input)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
+			   input ? BIT(pin) : 0);
+
+	return 0;
+}
+
+static int ocelot_gpio_request_enable(struct pinctrl_dev *pctldev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned int offset)
+{
+	struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(offset), 0);
+	regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(offset), 0);
+
+	return 0;
+}
+
+static const struct pinmux_ops ocelot_pmx_ops = {
+	.get_functions_count = ocelot_get_functions_count,
+	.get_function_name = ocelot_get_function_name,
+	.get_function_groups = ocelot_get_function_groups,
+	.set_mux = ocelot_pinmux_set_mux,
+	.gpio_set_direction = ocelot_gpio_set_direction,
+	.gpio_request_enable = ocelot_gpio_request_enable,
+};
+
+static int ocelot_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(ocelot_pins);
+}
+
+static const char *ocelot_pctl_get_group_name(struct pinctrl_dev *pctldev,
+					      unsigned int group)
+{
+	return ocelot_pins[group].name;
+}
+
+static int ocelot_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+				      unsigned int group,
+				      const unsigned int **pins,
+				      unsigned int *num_pins)
+{
+	*pins = &ocelot_pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static const struct pinctrl_ops ocelot_pctl_ops = {
+	.get_groups_count = ocelot_pctl_get_groups_count,
+	.get_group_name = ocelot_pctl_get_group_name,
+	.get_group_pins = ocelot_pctl_get_group_pins,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinconf_generic_dt_free_map,
+};
+
+static struct pinctrl_desc ocelot_desc = {
+	.name = "ocelot-pinctrl",
+	.pins = ocelot_pins,
+	.npins = ARRAY_SIZE(ocelot_pins),
+	.pctlops = &ocelot_pctl_ops,
+	.pmxops = &ocelot_pmx_ops,
+	.owner = THIS_MODULE,
+};
+
+static int ocelot_create_group_func_map(struct device *dev,
+					struct ocelot_pinctrl *info)
+{
+	u16 pins[ARRAY_SIZE(ocelot_pins)];
+	int f, npins, i;
+
+	for (f = 0; f < FUNC_MAX; f++) {
+		for (npins = 0, i = 0; i < ARRAY_SIZE(ocelot_pins); i++) {
+			if (ocelot_pin_function_idx(i, f) >= 0)
+				pins[npins++] = i;
+		}
+
+		info->func[f].ngroups = npins;
+		info->func[f].groups = devm_kzalloc(dev, npins *
+							 sizeof(char *),
+							 GFP_KERNEL);
+		if (!info->func[f].groups)
+			return -ENOMEM;
+
+		for (i = 0; i < npins; i++)
+			info->func[f].groups[i] = ocelot_pins[pins[i]].name;
+	}
+
+	return 0;
+}
+
+static int ocelot_pinctrl_register(struct platform_device *pdev,
+				   struct ocelot_pinctrl *info)
+{
+	int ret;
+
+	ret = ocelot_create_group_func_map(&pdev->dev, info);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to create group func map.\n");
+		return ret;
+	}
+
+	info->pctl = devm_pinctrl_register(&pdev->dev, &ocelot_desc, info);
+	if (IS_ERR(info->pctl)) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return PTR_ERR(info->pctl);
+	}
+
+	return 0;
+}
+
+static int ocelot_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int val;
+
+	regmap_read(info->map, OCELOT_GPIO_IN, &val);
+
+	return !!(val & BIT(offset));
+}
+
+static void ocelot_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+
+	if (value)
+		regmap_write(info->map, OCELOT_GPIO_OUT_SET, BIT(offset));
+	else
+		regmap_write(info->map, OCELOT_GPIO_OUT_CLR, BIT(offset));
+}
+
+static int ocelot_gpio_get_direction(struct gpio_chip *chip,
+				     unsigned int offset)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int val;
+
+	regmap_read(info->map, OCELOT_GPIO_OE, &val);
+
+	return !(val & BIT(offset));
+}
+
+static int ocelot_gpio_direction_input(struct gpio_chip *chip,
+				       unsigned int offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int ocelot_gpio_direction_output(struct gpio_chip *chip,
+					unsigned int offset, int value)
+{
+	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int pin = BIT(offset);
+
+	if (value)
+		regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
+	else
+		regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);
+
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static const struct gpio_chip ocelot_gpiolib_chip = {
+	.request = gpiochip_generic_request,
+	.free = gpiochip_generic_free,
+	.set = ocelot_gpio_set,
+	.get = ocelot_gpio_get,
+	.get_direction = ocelot_gpio_get_direction,
+	.direction_input = ocelot_gpio_direction_input,
+	.direction_output = ocelot_gpio_direction_output,
+	.owner = THIS_MODULE,
+};
+
+static int ocelot_gpiochip_register(struct platform_device *pdev,
+				    struct ocelot_pinctrl *info)
+{
+	struct gpio_chip *gc;
+	int ret;
+
+	info->gpio_chip = ocelot_gpiolib_chip;
+
+	gc = &info->gpio_chip;
+	gc->ngpio = OCELOT_PINS;
+	gc->parent = &pdev->dev;
+	gc->base = 0;
+	gc->of_node = info->dev->of_node;
+	gc->label = "ocelot-gpio";
+
+	ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
+	if (ret)
+		return ret;
+
+	/* TODO: this can be used as an irqchip but no board is using that */
+
+	return 0;
+}
+
+static const struct regmap_config ocelot_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0x64,
+};
+
+static const struct of_device_id ocelot_pinctrl_of_match[] = {
+	{ .compatible = "mscc,ocelot-pinctrl" },
+	{},
+};
+
+int ocelot_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ocelot_pinctrl *info;
+	void __iomem *base;
+	int ret;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	base = devm_ioremap_resource(dev,
+			platform_get_resource(pdev, IORESOURCE_MEM, 0));
+	if (IS_ERR(base)) {
+		dev_err(dev, "Failed to ioremap registers\n");
+		return PTR_ERR(base);
+	}
+
+	info->map = devm_regmap_init_mmio(dev, base,
+					  &ocelot_pinctrl_regmap_config);
+	if (IS_ERR(info->map)) {
+		dev_err(dev, "Failed to create regmap\n");
+		return PTR_ERR(info->map);
+	}
+	dev_set_drvdata(dev, info->map);
+	info->dev = dev;
+
+	ret = ocelot_pinctrl_register(pdev, info);
+	if (ret)
+		return ret;
+
+	ret = ocelot_gpiochip_register(pdev, info);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct platform_driver ocelot_pinctrl_driver = {
+	.driver = {
+		.name = "pinctrl-ocelot",
+		.of_match_table = of_match_ptr(ocelot_pinctrl_of_match),
+		.suppress_bind_attrs = true,
+	},
+	.probe = ocelot_pinctrl_probe,
+};
+builtin_platform_driver(ocelot_pinctrl_driver);
-- 
2.15.1

Re: [PATCH v3] pinctrl: Add Microsemi Ocelot SoC driver

[Linus Walleij]

On Sat, Jan 6, 2018 at 1:09 AM, Alexandre Belloni
<alexandre.belloni@free-electrons.com> wrote:

> The Microsemi Ocelot SoC has a few pins that can be used as GPIOs or take
> multiple other functions. Add a driver for the pinmuxing and the GPIOs.
>
> There is currently no support for interrupts.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
>  - use  pinctrl_gpio_direction_input/output from
>    ocelot_gpio_direction_input/output
>  - add a comment for ALT0/ALT1
>  - fill .max_register of ocelot_pinctrl_regmap_config

Patch applied. And it looks very good too.

This was all I had to do, right? No dependent patches?

Yours,
Linus Walleij

Re: [PATCH v3] pinctrl: Add Microsemi Ocelot SoC driver

[Alexandre Belloni]

On 09/01/2018 at 14:56:36 +0100, Linus Walleij wrote:
> On Sat, Jan 6, 2018 at 1:09 AM, Alexandre Belloni
> <alexandre.belloni@free-electrons.com> wrote:
> 
> > The Microsemi Ocelot SoC has a few pins that can be used as GPIOs or take
> > multiple other functions. Add a driver for the pinmuxing and the GPIOs.
> >
> > There is currently no support for interrupts.
> >
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> > ---
> >  - use  pinctrl_gpio_direction_input/output from
> >    ocelot_gpio_direction_input/output
> >  - add a comment for ALT0/ALT1
> >  - fill .max_register of ocelot_pinctrl_regmap_config
> 
> Patch applied. And it looks very good too.
> 
> This was all I had to do, right? No dependent patches?
> 

Nothing more for you, thanks! I'll get back to this driver if there is
interest in having IRQ support but I don't think this will happen soon.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com