[PATCH v3 1/4] arm64: qcom: Add support for Qualcomm MSM8916 SoC

[PATCH v3 1/4] arm64: qcom: Add support for Qualcomm MSM8916 SoC

[Kumar Gala]

From: Abhimanyu Kapur <abhimany@codeaurora.org>

Add support for Qualcomm MSM8916 SoC in arm64 Kconfig and defconfig.
Enable MSM8916 clock, pin control, and MSM serial driver utilized by
MSM8916 and Qualcomm SoCs in general.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
---
v3:
* Dropped ARCH_REQUIRE_GPIOLIB, COMMON_CLK_QCOM, and SOC_BUS
* Updated defconfig related to dropping various Kconfig options

v2:
* Dropped CONFIG_ARCH_QCOM_MSM8916, just use CONFIG_ARCH_QCOM
* Updated defconfig related to dropping CONFIG_ARCH_QCOM_MSM8916

 arch/arm64/Kconfig           | 6 ++++++
 arch/arm64/configs/defconfig | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1b8e973..610965dd 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -177,6 +177,12 @@ config ARCH_MEDIATEK
 	help
 	  Support for Mediatek MT65xx & MT81xx ARMv8 SoCs
 
+config ARCH_QCOM
+	bool "Qualcomm Platforms"
+	select PINCTRL
+	help
+	  This enables support for the ARMv8 based Qualcomm chipsets.
+
 config ARCH_SEATTLE
 	bool "AMD Seattle SoC Family"
 	help
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index be1f12a..d54a1f6 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -33,6 +33,7 @@ CONFIG_MODULE_UNLOAD=y
 # CONFIG_IOSCHED_DEADLINE is not set
 CONFIG_ARCH_FSL_LS2085A=y
 CONFIG_ARCH_MEDIATEK=y
+CONFIG_ARCH_QCOM=y
 CONFIG_ARCH_THUNDER=y
 CONFIG_ARCH_VEXPRESS=y
 CONFIG_ARCH_XGENE=y
@@ -93,11 +94,14 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_MT6577=y
 CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_SERIAL_MSM=y
+CONFIG_SERIAL_MSM_CONSOLE=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_VIRTIO_CONSOLE=y
 # CONFIG_HW_RANDOM is not set
 CONFIG_SPI=y
 CONFIG_SPI_PL022=y
+CONFIG_PINCTRL_MSM8916=y
 CONFIG_GPIO_PL061=y
 CONFIG_GPIO_XGENE=y
 # CONFIG_HWMON is not set
@@ -127,6 +131,8 @@ CONFIG_RTC_DRV_EFI=y
 CONFIG_RTC_DRV_XGENE=y
 CONFIG_VIRTIO_BALLOON=y
 CONFIG_VIRTIO_MMIO=y
+CONFIG_COMMON_CLK_QCOM=y
+CONFIG_MSM_GCC_8916=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_PHY_XGENE=y
 CONFIG_EXT2_FS=y
-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Kumar Gala]

Add initial device tree support for Qualcomm MSM8916 SoC and MTP8916
evaluation board.  At the current time we only boot up a single processor.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
---
v3:
* Removed qcom,msm-id and qcom,board-id
* Added top level compat for "qcom,msm8916-mtp-smb1360"

v2:
* Updated to dropping CONFIG_ARCH_QCOM_MSM8916
* Updated to use qcom-ids.h
 arch/arm64/boot/dts/Makefile              |   1 +
 arch/arm64/boot/dts/qcom/Makefile         |   5 +
 arch/arm64/boot/dts/qcom/msm8916-mtp.dts  |  21 ++++
 arch/arm64/boot/dts/qcom/msm8916-mtp.dtsi |  24 ++++
 arch/arm64/boot/dts/qcom/msm8916.dtsi     | 184 ++++++++++++++++++++++++++++++
 5 files changed, 235 insertions(+)
 create mode 100644 arch/arm64/boot/dts/qcom/Makefile
 create mode 100644 arch/arm64/boot/dts/qcom/msm8916-mtp.dts
 create mode 100644 arch/arm64/boot/dts/qcom/msm8916-mtp.dtsi
 create mode 100644 arch/arm64/boot/dts/qcom/msm8916.dtsi

diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index e0350ca..8517f15 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -5,5 +5,6 @@ dts-dirs += cavium
 dts-dirs += exynos
 dts-dirs += freescale
 dts-dirs += mediatek
+dts-dirs += qcom
 
 subdir-y	:= $(dts-dirs)
diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
new file mode 100644
index 0000000..360ec4c
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -0,0 +1,5 @@
+dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-mtp.dtb
+
+always		:= $(dtb-y)
+subdir-y	:= $(dts-dirs)
+clean-files	:= *.dtb
diff --git a/arch/arm64/boot/dts/qcom/msm8916-mtp.dts b/arch/arm64/boot/dts/qcom/msm8916-mtp.dts
new file mode 100644
index 0000000..784ad92
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/msm8916-mtp.dts
@@ -0,0 +1,21 @@
+/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 and
+* only version 2 as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+/dts-v1/;
+
+#include "msm8916-mtp.dtsi"
+
+/ {
+	model = "Qualcomm Technologies, Inc. MSM 8916 MTP";
+	compatible = "qcom,msm8916-mtp", "qcom,msm8916-mtp-smb1360",
+			"qcom,msm8916", "qcom,mtp";
+};
diff --git a/arch/arm64/boot/dts/qcom/msm8916-mtp.dtsi b/arch/arm64/boot/dts/qcom/msm8916-mtp.dtsi
new file mode 100644
index 0000000..4d2f073
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/msm8916-mtp.dtsi
@@ -0,0 +1,24 @@
+/* Copyright (c) 2014-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "msm8916.dtsi"
+
+/ {
+	soc {
+		serial@78b0000 {
+			status = "okay";
+			pinctrl-names = "default", "sleep";
+			pinctrl-0 = <&blsp1_uart2_default>;
+			pinctrl-1 = <&blsp1_uart2_sleep>;
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
new file mode 100644
index 0000000..957486f
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
@@ -0,0 +1,184 @@
+/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "skeleton.dtsi"
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/clock/qcom,gcc-msm8916.h>
+#include <dt-bindings/reset/qcom,gcc-msm8916.h>
+
+/ {
+	model = "Qualcomm Technologies, Inc. MSM8916";
+	compatible = "qcom,msm8916";
+
+	interrupt-parent = <&intc>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		CPU0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53", "arm,armv8";
+			reg = <0x0>;
+		};
+
+		CPU1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53", "arm,armv8";
+			reg = <0x1>;
+		};
+
+		CPU2: cpu@2 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53", "arm,armv8";
+			reg = <0x2>;
+		};
+
+		CPU3: cpu@3 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53", "arm,armv8";
+			reg = <0x3>;
+		};
+	};
+
+	timer {
+		compatible = "arm,armv7-timer";
+		interrupts = <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 4 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
+		clock-frequency = <19200000>;
+	};
+
+	soc: soc {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0 0xffffffff>;
+		compatible = "simple-bus";
+
+		pinctrl@1000000 {
+			compatible = "qcom,msm8916-pinctrl";
+			reg = <0x1000000 0x300000>;
+			interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
+
+			blsp1_uart2_default: blsp1_uart2_default {
+				pinmux {
+					function = "blsp_uart2";
+					pins = "gpio4", "gpio5";
+				};
+				pinconf {
+					pins = "gpio4", "gpio5";
+					drive-strength = <16>;
+					bias-disable;
+				};
+			};
+
+			blsp1_uart2_sleep: blsp1_uart2_sleep {
+				pinmux {
+					function = "blsp_uart2";
+					pins = "gpio4", "gpio5";
+				};
+				pinconf {
+					pins = "gpio4", "gpio5";
+					drive-strength = <2>;
+					bias-pull-down;
+				};
+			};
+		};
+
+		gcc: qcom,gcc@1800000 {
+			compatible = "qcom,gcc-msm8916";
+			#clock-cells = <1>;
+			#reset-cells = <1>;
+			reg = <0x1800000 0x80000>;
+		};
+
+		blsp1_uart2: serial@78b0000 {
+			compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
+			reg = <0x78b0000 0x200>;
+			interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
+			clock-names = "core", "iface";
+			status = "disabled";
+		};
+
+		intc: interrupt-controller@b000000 {
+			compatible = "qcom,msm-qgic2";
+			interrupt-controller;
+			#interrupt-cells = <3>;
+			reg = <0x0b000000 0x1000>, <0x0b002000 0x1000>;
+		};
+
+		timer@b020000 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			compatible = "arm,armv7-timer-mem";
+			reg = <0xb020000 0x1000>;
+			clock-frequency = <19200000>;
+
+			frame@b021000 {
+				frame-number = <0>;
+				interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
+					     <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb021000 0x1000>,
+				      <0xb022000 0x1000>;
+			};
+
+			frame@b023000 {
+				frame-number = <1>;
+				interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb023000 0x1000>;
+				status = "disabled";
+			};
+
+			frame@b024000 {
+				frame-number = <2>;
+				interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb024000 0x1000>;
+				status = "disabled";
+			};
+
+			frame@b025000 {
+				frame-number = <3>;
+				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb025000 0x1000>;
+				status = "disabled";
+			};
+
+			frame@b026000 {
+				frame-number = <4>;
+				interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb026000 0x1000>;
+				status = "disabled";
+			};
+
+			frame@b027000 {
+				frame-number = <5>;
+				interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb027000 0x1000>;
+				status = "disabled";
+			};
+
+			frame@b028000 {
+				frame-number = <6>;
+				interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
+				reg = <0xb028000 0x1000>;
+				status = "disabled";
+			};
+		};
+	};
+};
-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Mark Rutland]

Hi Kumar,

> +/ {
> +	model = "Qualcomm Technologies, Inc. MSM 8916 MTP";
> +	compatible = "qcom,msm8916-mtp", "qcom,msm8916-mtp-smb1360",
> +			"qcom,msm8916", "qcom,mtp";
> +};

No /chosen/stdout-path?

Does your UART driver support earlycon?

[...]

> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		CPU0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0>;
> +		};
> +
> +		CPU1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x1>;
> +		};
> +
> +		CPU2: cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x2>;
> +		};
> +
> +		CPU3: cpu@3 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x3>;
> +		};
> +	};

The secondary CPUs need an enable-method. Are you using PSCI or
spin-table? 

Which exception level do the CPUs enter the kernel?

> +	timer {
> +		compatible = "arm,armv7-timer";

This should be "arm,armv8-timer".

> +		interrupts = <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 4 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +		clock-frequency = <19200000>;
> +	};

NAK. CNTFRQ should be programmed on all CPUs prior to entering the
kernel, per the boot protocol. You should not need clock-frequency here.

[...]

> +		intc: interrupt-controller@b000000 {
> +			compatible = "qcom,msm-qgic2";

This string isn't documented (but seems to be supported by the GIC
driver).

How does this differ from other GIC implementations?

> +			interrupt-controller;
> +			#interrupt-cells = <3>;
> +			reg = <0x0b000000 0x1000>, <0x0b002000 0x1000>;
> +		};

No GICH, GICV, maintenance interrupt?

Minor nit, but I'd prefer if the reg entries were on individual lines as
happens in other dts.

Thanks,
Mark.

Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Kumar Gala]

On Mar 12, 2015, at 12:05 PM, Mark Rutland <mark.rutland@arm.com> wrote:

> Hi Kumar,
> 
>> +/ {
>> +	model = "Qualcomm Technologies, Inc. MSM 8916 MTP";
>> +	compatible = "qcom,msm8916-mtp", "qcom,msm8916-mtp-smb1360",
>> +			"qcom,msm8916", "qcom,mtp";
>> +};
> 
> No /chosen/stdout-path?

Nope ;).

> 
> Does your UART driver support earlycon?

It does.

> 
> [...]
> 
>> +	cpus {
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		CPU0: cpu@0 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0>;
>> +		};
>> +
>> +		CPU1: cpu@1 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x1>;
>> +		};
>> +
>> +		CPU2: cpu@2 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x2>;
>> +		};
>> +
>> +		CPU3: cpu@3 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x3>;
>> +		};
>> +	};
> 
> The secondary CPUs need an enable-method. Are you using PSCI or
> spin-table?

This is on purpose.  We aren’t using either PSCI or spin-table.  Right now the dts is for booting on a single core.  I can drop CPU1..CPU3 if that helps.

> Which exception level do the CPUs enter the kernel?
> 
>> +	timer {
>> +		compatible = "arm,armv7-timer";
> 
> This should be "arm,armv8-timer”.

will change

> 
>> +		interrupts = <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 4 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
>> +		clock-frequency = <19200000>;
>> +	};
> 
> NAK. CNTFRQ should be programmed on all CPUs prior to entering the
> kernel, per the boot protocol. You should not need clock-frequency here.

Will drop clock-frequency.

> [...]
> 
>> +		intc: interrupt-controller@b000000 {
>> +			compatible = "qcom,msm-qgic2";
> 
> This string isn't documented (but seems to be supported by the GIC
> driver).

There’s a patch posted to add ‘qcom,msm-qgic2’ to the binding doc.

> How does this differ from other GIC implementations?

Not sure the exact details, just that its qcom’s on implementation of the GIC spec.

> 
>> +			interrupt-controller;
>> +			#interrupt-cells = <3>;
>> +			reg = <0x0b000000 0x1000>, <0x0b002000 0x1000>;
>> +		};
> 
> No GICH, GICV, maintenance interrupt?

Nope.

> 
> Minor nit, but I'd prefer if the reg entries were on individual lines as
> happens in other dts.
> 
> Thanks,
> Mark.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Mark Rutland]

> >> +	cpus {
> >> +		#address-cells = <1>;
> >> +		#size-cells = <0>;
> >> +
> >> +		CPU0: cpu@0 {
> >> +			device_type = "cpu";
> >> +			compatible = "arm,cortex-a53", "arm,armv8";
> >> +			reg = <0x0>;
> >> +		};
> >> +
> >> +		CPU1: cpu@1 {
> >> +			device_type = "cpu";
> >> +			compatible = "arm,cortex-a53", "arm,armv8";
> >> +			reg = <0x1>;
> >> +		};
> >> +
> >> +		CPU2: cpu@2 {
> >> +			device_type = "cpu";
> >> +			compatible = "arm,cortex-a53", "arm,armv8";
> >> +			reg = <0x2>;
> >> +		};
> >> +
> >> +		CPU3: cpu@3 {
> >> +			device_type = "cpu";
> >> +			compatible = "arm,cortex-a53", "arm,armv8";
> >> +			reg = <0x3>;
> >> +		};
> >> +	};
> > 
> > The secondary CPUs need an enable-method. Are you using PSCI or
> > spin-table?
> 
> This is on purpose.  We aren’t using either PSCI or spin-table.  Right
> now the dts is for booting on a single core.  I can drop CPU1..CPU3 if
> that helps.

We won't poke the CPUs without an enable-method, so personally I'm not
too worried either way about having the CPUs listed.

Which of spin-table/psci are you planning on using for SMP support, and
when would that be likely to appear?

Which exception level do CPUs enter the kernel? Even without a
virt-capable GIC booting at EL2 is less work for the FW and gives the
kernel a better chance of fixing things up (e.g. CNTVOFF).

Thanks,
Mark.

Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Kumar Gala]

On Mar 12, 2015, at 1:25 PM, Mark Rutland <mark.rutland@arm.com> wrote:

>>>> +	cpus {
>>>> +		#address-cells = <1>;
>>>> +		#size-cells = <0>;
>>>> +
>>>> +		CPU0: cpu@0 {
>>>> +			device_type = "cpu";
>>>> +			compatible = "arm,cortex-a53", "arm,armv8";
>>>> +			reg = <0x0>;
>>>> +		};
>>>> +
>>>> +		CPU1: cpu@1 {
>>>> +			device_type = "cpu";
>>>> +			compatible = "arm,cortex-a53", "arm,armv8";
>>>> +			reg = <0x1>;
>>>> +		};
>>>> +
>>>> +		CPU2: cpu@2 {
>>>> +			device_type = "cpu";
>>>> +			compatible = "arm,cortex-a53", "arm,armv8";
>>>> +			reg = <0x2>;
>>>> +		};
>>>> +
>>>> +		CPU3: cpu@3 {
>>>> +			device_type = "cpu";
>>>> +			compatible = "arm,cortex-a53", "arm,armv8";
>>>> +			reg = <0x3>;
>>>> +		};
>>>> +	};
>>> 
>>> The secondary CPUs need an enable-method. Are you using PSCI or
>>> spin-table?
>> 
>> This is on purpose.  We aren’t using either PSCI or spin-table.  Right
>> now the dts is for booting on a single core.  I can drop CPU1..CPU3 if
>> that helps.
> 
> We won't poke the CPUs without an enable-method, so personally I'm not
> too worried either way about having the CPUs listed.

That was my thinking, so left them in.

> Which of spin-table/psci are you planning on using for SMP support, and
> when would that be likely to appear?

We have a qcom specific SMP enablement method for this device.  This was one of our first devices so it utilized as much from arm 32-bit as possible.

> Which exception level do CPUs enter the kernel? Even without a
> virt-capable GIC booting at EL2 is less work for the FW and gives the
> kernel a better chance of fixing things up (e.g. CNTVOFF).

I think the enter in EL1.

- k
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a Linux Foundation Collaborative Project

Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Mark Rutland]

> > Which of spin-table/psci are you planning on using for SMP support, and
> > when would that be likely to appear?
> 
> We have a qcom specific SMP enablement method for this device.  This
> was one of our first devices so it utilized as much from arm 32-bit as
> possible.

Implementation specific enable methods are something we really don't
want to see for arm64. If PSCI is out of the question then a spin-table
shim in your bootloader shouldn't be too hard to implement.

> > Which exception level do CPUs enter the kernel? Even without a
> > virt-capable GIC booting at EL2 is less work for the FW and gives the
> > kernel a better chance of fixing things up (e.g. CNTVOFF).
> 
> I think the enter in EL1.

That's unfortunate, but so long as they are consistent, it's not the end
of the world.

Mark.
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Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

[Catalin Marinas]

On Fri, Mar 13, 2015 at 10:34:54AM +0000, Mark Rutland wrote:
> > > Which of spin-table/psci are you planning on using for SMP support, and
> > > when would that be likely to appear?
> > 
> > We have a qcom specific SMP enablement method for this device.  This
> > was one of our first devices so it utilized as much from arm 32-bit as
> > possible.
> 
> Implementation specific enable methods are something we really don't
> want to see for arm64.

I fully agree (and we've been stating this for over two years).

> If PSCI is out of the question then a spin-table shim in your
> bootloader shouldn't be too hard to implement.

And I guess only WFI cpuidle supported in Linux.

-- 
Catalin

[PATCH v3 3/4] devicetree: bindings: Document qcom,msm-id and qcom,board-id

[Kumar Gala]

The top level qcom,msm-id and qcom,board-id are utilized by bootloaders
on Qualcomm MSM platforms to determine which device tree should be
utilized and passed to the kernel.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>
---
 Documentation/devicetree/bindings/arm/msm/ids.txt | 65 +++++++++++++++++++++++
 include/dt-bindings/arm/qcom-ids.h                | 33 ++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/msm/ids.txt
 create mode 100644 include/dt-bindings/arm/qcom-ids.h

diff --git a/Documentation/devicetree/bindings/arm/msm/ids.txt b/Documentation/devicetree/bindings/arm/msm/ids.txt
new file mode 100644
index 0000000..9ee8428
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/msm/ids.txt
@@ -0,0 +1,65 @@
+* MSM-ID
+
+The qcom,msm-id entry specifies the MSM chipset and hardware revision.  It can
+optionally be an array of these to indicate multiple hardware that use the same
+device tree.  It is expected that the bootloader will use this information at
+boot-up to decide which device tree to use when given multiple device trees,
+some of which may not be compatible with the actual hardware.  It is the
+bootloader's responsibility to pass the correct device tree to the kernel.
+
+PROPERTIES
+
+- qcom,msm-id:
+	Usage: required
+	Value type: <prop-encoded-array> (<chipset_id, rev_id> [, <c2, r2> ..])
+	Definition:
+		The "chipset_id" consists of three fields as below:
+
+		bits 0-15  = The unique MSM chipset id.
+		bits 16-31 = Reserved.  Should be 0
+
+		chipset_id is an exact match value
+
+		The "rev_id" is a chipset specific 32-bit id that represents
+		the version of the chipset.
+
+		The rev_id is a best match id.  The bootloader will look for
+		the closest possible patch.
+
+* BOARD-ID
+
+The qcom,board-id entry specifies the board type and revision information.  It
+can optionally be an array of these to indicate multiple boards that use the
+same device tree.  It is expected that the bootloader will use this information
+at boot-up to decide which device tree to use when given multiple device trees,
+some of which may not be compatible with the actual hardware.  It is the
+bootloader's responsibility to pass the correct device tree to the kernel.
+
+PROPERTIES
+
+- qcom,board-id:
+	Usage: required
+	Value type: <prop-encoded-array> (<board_id, subtype_id> [, <b2, s2> ..])
+	Definition:
+		The "board_id" consists of three fields as below:
+
+		bits 31-24 = Unusued.
+		bits 23-16 = Platform Version Major
+		bits 15-8  = Platfrom Version Minor
+		bits 7-0   = Platform Type
+
+		Platform Type field is an exact match value.  The Platform
+		Major/Minor field is a best match.  The bootloader will look
+		for the closest possible match.
+
+		The "subtype_id" is unique to a Platform Type/Chipset ID.  For
+		a given Platform Type, there will typically only be a single
+		board and the subtype_id will be 0.  However in some cases board
+		variants may need to be distinquished by different subtype_id
+		values.
+
+		subtype_id is an exact match value.
+
+EXAMPLE:
+	qcom,board-id = <15 2>;
+	qcom,msm-id = <0x1007e 0>;
diff --git a/include/dt-bindings/arm/qcom-ids.h b/include/dt-bindings/arm/qcom-ids.h
new file mode 100644
index 0000000..a18f34e
--- /dev/null
+++ b/include/dt-bindings/arm/qcom-ids.h
@@ -0,0 +1,33 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#ifndef __DT_BINDINGS_QCOM_IDS_H
+#define __DT_BINDINGS_QCOM_IDS_H
+
+/* qcom,msm-id */
+#define QCOM_ID_MSM8916		206
+#define QCOM_ID_APQ8016		247
+#define QCOM_ID_MSM8216		248
+#define QCOM_ID_MSM8116		249
+#define QCOM_ID_MSM8616		250
+
+/* qcom,board-id */
+#define QCOM_BRD_ID(a, major, minor) \
+	(((major & 0xff) << 16) | ((minor & 0xff) << 8) | QCOM_BRD_ID_##a)
+
+#define QCOM_BRD_ID_MTP		8
+#define QCOM_BRD_ID_DRAGONBRD	10
+#define QCOM_BRD_ID_SBC		24
+
+#define QCOM_BRD_SUBTYPE_DEFAULT		0
+#define QCOM_BRD_SUBTYPE_MTP8916_SMB1360	1
+
+#endif
-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v3 4/4] arm64: dts: Add Qualcomm MSM8916 & MTP8916 ids

[Kumar Gala]

Add qcom,msm-id and qcom,board-id to allow bootloader to identify which
device tree to boot on the MTP8916 boards.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
---
 arch/arm64/boot/dts/qcom/msm8916-mtp.dts | 3 +++
 arch/arm64/boot/dts/qcom/msm8916.dtsi    | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-mtp.dts b/arch/arm64/boot/dts/qcom/msm8916-mtp.dts
index 784ad92..8be101c 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/msm8916-mtp.dts
@@ -12,10 +12,13 @@
 
 /dts-v1/;
 
+#include <dt-bindings/arm/qcom-ids.h>
 #include "msm8916-mtp.dtsi"
 
 / {
 	model = "Qualcomm Technologies, Inc. MSM 8916 MTP";
 	compatible = "qcom,msm8916-mtp", "qcom,msm8916-mtp-smb1360",
 			"qcom,msm8916", "qcom,mtp";
+	qcom,board-id = <QCOM_BRD_ID(MTP, 1, 0) QCOM_BRD_SUBTYPE_DEFAULT>,
+			<QCOM_BRD_ID(MTP, 1, 0) QCOM_BRD_SUBTYPE_MTP8916_SMB1360>;
 };
diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
index 957486f..41f1c0f 100644
--- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
@@ -14,10 +14,15 @@
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/clock/qcom,gcc-msm8916.h>
 #include <dt-bindings/reset/qcom,gcc-msm8916.h>
+#include <dt-bindings/arm/qcom-ids.h>
 
 / {
 	model = "Qualcomm Technologies, Inc. MSM8916";
 	compatible = "qcom,msm8916";
+	qcom,msm-id =	<QCOM_ID_MSM8916 0>,
+			<QCOM_ID_MSM8216 0>,
+			<QCOM_ID_MSM8116 0>,
+			<QCOM_ID_MSM8616 0>;
 
 	interrupt-parent = <&intc>;
 
-- 
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a Linux Foundation Collaborative Project