Support NVIDIA Tegra-based Acer A500 and Nexus 7 devices

Hello,

This series introduces upstream kernel support for Acer Iconia Tab A500 and ASUS Google Nexus 7 tablet devices. Please review and apply, thanks in advance.

Changelog:

v8: - The eMMC voltage regulator is now marked as always-ON in all
device-trees because turned out that some bootloader versions have assumption about the enabled regulator at a boot time. This fixes machine hanging on a warm reboot, it's also matching the downstream kernel regulator configuration.

- The core regulator of the Ti PMIC Nexus 7 variant is now limited to a 1.35V, which is a more realistic limit than 1.5V that was borrowed from the Cardhu device-tree. Now both Maxim and Ti variants have the common limits.

- Added acks from Rob Herring.

v7: - This version brings support for a Nexus 7 variant that uses Ti PMIC
instead of the Maxim PMIC. Previously we assumed that variant with the Ti PMIC doesn't exist in a wild, but turned out that it was a wrong assumption. In a result the device-trees are separated into more DTSI pieces, which combined together form the final device-tree. Thanks to Zack Pearsall for testing the Ti version!

- The camera voltage regulator is now preset to a correct 1.8v in the Nexus 7 device-tree.

v6: - Corrected PMIC's RTC alias in the DTs. Sometime ago I renamed the
PMIC's node to match the modern upstream styling, but forgot to change the RTC alias. Now PMIC RTC alias uses node's handle instead of string.

- Removed "panel: " handle from device trees, which became unused after v5 and I just missed to remove it.

v5: - After spending some more time on adding LVDS encoder bridge support
to the Tegra DRM driver, I'm now having a second thought and agree with Thierry Reding that in a longer run it should be better not to mix old nvidia,panel with new output graph in device-tree. So the nvidia,panel phandle is removed now in both A500 and Nexus 7 DTs.

v4: - Corrected CPU's thermal zone on both A500 and Nexus 7, which
should use the remote thermal sensor (Tegra chip) instead of the local ("skin" temperature).

- Added default PMIC pinmux state on Nexus 7, for completeness.

- Added PMIC cpu_pwr_req GPIO hog on Nexus 7, for completeness.

- Renamed thermal sensor node label to NCT72 on Nexus 7 to match the actual hardware (NCT72 is compatible with NCT1008). For completeness.

- Added always-on USB AVDD regulator on Nexus 7, which is controlled by the PMIC GPIO. For completeness.

- Added PMIC GPIO enable-control to the 3v3_sys regulator on Nexus 7, for completeness.

- Added CONFIG_NAMESPACES, CONFIG_USER_NS, CONFIG_SECCOMP and CONFIG_PINCTRL_MAX77620 to the tegra_defconfig. The first three options are must-have for the modern userspace, the last is somewhat actual now since the default PMIC pinmux state is added to the N7 DT.

v3: - Improved device-tree node-names in accordance to review comments that
were made by Thierry Reding to v2.

- Corrected LVDS encoder powerdown-GPIO polarity on both A500 and Nexus 7 because I implemented the DRM bridges support in the Tegra DRM driver and found that there was a mistake in the device-trees. The updated polarity also matches the boards schematics. Now DRM bridges support becomes mandatory since LVDS is getting disabled during of the encoder driver probing. I'll send the DRM patch separately from this series.

- Replaced recently deprecated CONFIG_DRM_LVDS_ENCODER with the new CONFIG_DRM_LVDS_CODEC in tegra_defconfig.

- Added more config options to tegra_defconfig, like pstore and thermal.

- Added atmel,cfg_name to the A500 DT, which is a new upcoming property in 5.8+ that allows to specify the per-board hardware config file name.

v2: - Corrected "volume down" key-label in the grouper's device-tree and
improved some other names in device-trees.

- Added optional (upcoming in 5.8+) VDD/AVDD regulators to the touchscreen node in A500 device-tree.

Dmitry Osipenko (6):
ARM: tegra: Add device-tree for Acer Iconia Tab A500
ARM: tegra: Add device-tree for ASUS Google Nexus 7
dt-bindings: Add vendor prefix for Acer Inc.
dt-bindings: ARM: tegra: Add Acer Iconia Tab A500
dt-bindings: ARM: tegra: Add ASUS Google Nexus 7
ARM: tegra_defconfig: Enable options useful for Nexus 7 and Acer A500

 .../devicetree/bindings/arm/tegra.yaml        |   10 +
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 arch/arm/boot/dts/Makefile                    |    4 +
 .../boot/dts/tegra20-acer-a500-picasso.dts    | 1458 ++++++++++
 .../dts/tegra30-asus-nexus7-grouper-E1565.dts |    9 +
 .../dts/tegra30-asus-nexus7-grouper-PM269.dts |    9 +
 .../tegra30-asus-nexus7-grouper-common.dtsi   | 2503 +++++++++++++++++
 ...egra30-asus-nexus7-grouper-maxim-pmic.dtsi |  188 ++
 .../tegra30-asus-nexus7-grouper-ti-pmic.dtsi  |  151 +
 .../boot/dts/tegra30-asus-nexus7-grouper.dtsi |  462 +++
 .../dts/tegra30-asus-nexus7-tilapia-E1565.dts |    9 +
 .../boot/dts/tegra30-asus-nexus7-tilapia.dtsi |  548 ++++
 arch/arm/configs/tegra_defconfig              |   42 +
 13 files changed, 5395 insertions(+)
 create mode 100644 arch/arm/boot/dts/tegra20-acer-a500-picasso.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-E1565.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-PM269.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-maxim-pmic.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-ti-pmic.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-tilapia-E1565.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-tilapia.dtsi

2.26.0

Add device-tree for Acer Iconia Tab A500, which is NVIDIA Tegra20-based tablet device.

---
 arch/arm/boot/dts/Makefile                    |    1 +
 .../boot/dts/tegra20-acer-a500-picasso.dts    | 1458 +++++++++++++++++
 2 files changed, 1459 insertions(+)
 create mode 100644 arch/arm/boot/dts/tegra20-acer-a500-picasso.dts

index aef6a32c205c..93cbd99e57b6 100644
@@ -1190,6 +1190,7 @@ dtb-$(CONFIG_MACH_SUNIV) += \
 dtb-$(CONFIG_ARCH_TANGO) += \
 	tango4-vantage-1172.dtb
 dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
+	tegra20-acer-a500-picasso.dtb \
 	tegra20-harmony.dtb \
 	tegra20-colibri-eval-v3.dtb \
 	tegra20-colibri-iris.dtb \

2.26.0

There are few hardware variants of NVIDIA Tegra30-based Nexus 7 device:

1. WiFi-only (named Grouper)
2. GSM (named Tilapia)
3. Using Maxim PMIC (E1565 board ID)
4. Using Ti PMIC (PM269 board ID)

This patch adds device-trees for known and tested variants.

---
 arch/arm/boot/dts/Makefile                    |    3 +
 .../dts/tegra30-asus-nexus7-grouper-E1565.dts |    9 +
 .../dts/tegra30-asus-nexus7-grouper-PM269.dts |    9 +
 .../tegra30-asus-nexus7-grouper-common.dtsi   | 2503 +++++++++++++++++
 ...egra30-asus-nexus7-grouper-maxim-pmic.dtsi |  188 ++
 .../tegra30-asus-nexus7-grouper-ti-pmic.dtsi  |  151 +
 .../boot/dts/tegra30-asus-nexus7-grouper.dtsi |  462 +++
 .../dts/tegra30-asus-nexus7-tilapia-E1565.dts |    9 +
 .../boot/dts/tegra30-asus-nexus7-tilapia.dtsi |  548 ++++
 9 files changed, 3882 insertions(+)
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-E1565.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-PM269.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-maxim-pmic.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper-ti-pmic.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-grouper.dtsi
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-tilapia-E1565.dts
 create mode 100644 arch/arm/boot/dts/tegra30-asus-nexus7-tilapia.dtsi

index 93cbd99e57b6..00a58e5f49fb 100644
@@ -1204,6 +1204,9 @@ dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 dtb-$(CONFIG_ARCH_TEGRA_3x_SOC) += \
 	tegra30-apalis-eval.dtb \
 	tegra30-apalis-v1.1-eval.dtb \
+	tegra30-asus-nexus7-grouper-PM269.dtb \
+	tegra30-asus-nexus7-grouper-E1565.dtb \
+	tegra30-asus-nexus7-tilapia-E1565.dtb \
 	tegra30-beaver.dtb \
 	tegra30-cardhu-a02.dtb \
 	tegra30-cardhu-a04.dtb \

new file mode 100644
index 000000000000..a25b8560b0cd
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "tegra30-asus-nexus7-grouper-maxim-pmic.dtsi"
+#include "tegra30-asus-nexus7-grouper.dtsi"
+
+/ {
+	model = "ASUS Google Nexus 7 (Project Nakasi / ME370T) E1565";
+};

new file mode 100644
index 000000000000..06ef13ea5df8
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "tegra30-asus-nexus7-grouper-ti-pmic.dtsi"
+#include "tegra30-asus-nexus7-grouper.dtsi"
+
+/ {
+	model = "ASUS Google Nexus 7 (Project Nakasi / ME370T) PM269";
+};

new file mode 100644
index 000000000000..f1c63feb4af9

2.26.0

Part of the diff is not shown here. View the raw message.

Hi,

I've briefly looked at the PM269 devicetree (PMIC part) and it looks very similar, if not the same, to what I deduced from the TF300T kernel. Those devices don't look to differ much from original Cardhu tablet devkit, so maybe the trees can base off of that?

I would also guess that because of this 'ram-code', memory timings would be duplicated between devices. I can see small differences between ram-code=1 timings of Grouper and TF300T, though they look like arbiter tuning differences. I'll have to test if my TF300T works with Grouper's settings. In case they work, could you split the memory timings to another dtsi file?

BTW, shouldn't EMC timing set match MC? I see more frequencies listed in MC than EMC nodes.

Best Regards,
Michał Mirosław

15.05.2020 21:18, Michał Mirosław пишет:

Hello Michał,

Definitely there are board parts that are reused by different devices. This is not surprising since most of the boards are designed by the same company.

I don't think it's really possible in a case of Nexus 7 because in overall the used hardware components differ a bit too much. It shouldn't worth the effort, IMO.

Yes, perhaps this could be done. The memory timings on Grouper and Tilapia are pretty much the same as well. As you noticed, there are some tuning differences of TF300T in comparison to the Nexus 7, the same applies to the Grouper and Tilapia variants.

The MC timings are exactly the same on Grouper and Tilapia, but EMC timings have a very minor differences, and thus, the common.dtsi misses these differentiating EMC timings, they are defined in grouper.dtsi and tilapia.dts.

I guess we indeed could try to select the lowest common denominator timing and re-use it. I'll consider this change for v9, thank you very much for the suggestion.

16.05.2020 15:01, Dmitry Osipenko пишет:

Hello Michał,

I tried to investigate whether we could unify the memory timings and it's hard to tell. The values are mostly off by one in most cases for one or two registers, in others cases a memory-chip feature is enabled or disabled for the same memory module. It certainly feels like we could safely ignore all those minor differences, but I don't have enough expertise in order to decide firmly. In my opinion it should be better to leave the memory timings as-is for the starter, we could always get back to the unification later on.

Acer is a hardware and electronics corporation, specializing in advanced electronics technology. Acer's products include desktop PCs, laptop PCs, tablets, servers, displays, storage devices, virtual reality devices, smartphones and peripherals. Their web site is http://www.acer.com/.

---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

index a43ad3f9ff59..ce71327cce11 100644
@@ -27,6 +27,8 @@ patternProperties:
     description: Abilis Systems
   "^abracon,.*":
     description: Abracon Corporation
+  "^acer,.*":
+    description: Acer Inc.
   "^acme,.*":
     description: Acme Systems srl
   "^actions,.*":

2.26.0

Add a binding for the Tegra20-based Acer Iconia Tab A500 tablet device.

---
 Documentation/devicetree/bindings/arm/tegra.yaml | 3 +++
 1 file changed, 3 insertions(+)

index 60b38eb5c61a..7fd0b66c69b2 100644
@@ -34,6 +34,9 @@ properties:
               - toradex,colibri_t20-iris
           - const: toradex,colibri_t20
           - const: nvidia,tegra20
+      - items:
+          - const: acer,picasso
+          - const: nvidia,tegra20
       - items:
           - enum:
               - nvidia,beaver

2.26.0

Add a binding for the Tegra30-based ASUS Google Nexus 7 tablet device.

---
 Documentation/devicetree/bindings/arm/tegra.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

index 7fd0b66c69b2..fb3bbf7a5fb4 100644
@@ -62,6 +62,13 @@ properties:
               - toradex,colibri_t30-eval-v3
           - const: toradex,colibri_t30
           - const: nvidia,tegra30
+      - items:
+          - const: asus,grouper
+          - const: nvidia,tegra30
+      - items:
+          - const: asus,tilapia
+          - const: asus,grouper
+          - const: nvidia,tegra30
       - items:
           - enum:
               - nvidia,dalmore

2.26.0

Enable several very useful options and drivers for hardware that is found on Nexus 7 and Acer A500 tablet devices. Please note that some drivers may require firmware files extracted from original Android image.

---
 arch/arm/configs/tegra_defconfig | 42 ++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

index 0029259a6bf5..b382f06f835b 100644
@@ -10,6 +10,8 @@ CONFIG_RT_GROUP_SCHED=y
 CONFIG_CGROUP_FREEZER=y
 CONFIG_CGROUP_CPUACCT=y
 CONFIG_CGROUP_DEBUG=y
+CONFIG_NAMESPACES=y
+CONFIG_USER_NS=y
 CONFIG_BLK_DEV_INITRD=y
 # CONFIG_ELF_CORE is not set
 CONFIG_EMBEDDED=y

@@ -18,6 +20,7 @@ CONFIG_SLAB=y
 CONFIG_ARCH_TEGRA=y
 CONFIG_SMP=y
 CONFIG_HIGHMEM=y
+CONFIG_SECCOMP=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_KEXEC=y

@@ -63,11 +66,17 @@ CONFIG_BT_RFCOMM=y
 CONFIG_BT_BNEP=y
 CONFIG_BT_HIDP=y
 CONFIG_BT_HCIBTUSB=m
+CONFIG_BT_HCIUART=y
+CONFIG_BT_HCIUART_BCM=y
 CONFIG_CFG80211=y
 CONFIG_MAC80211=y
 CONFIG_RFKILL=y
 CONFIG_RFKILL_INPUT=y
 CONFIG_RFKILL_GPIO=y
+CONFIG_NFC=y
+CONFIG_NFC_HCI=y
+CONFIG_NFC_SHDLC=y
+CONFIG_NFC_PN544_I2C=y
 CONFIG_PCI=y
 CONFIG_PCIEPORTBUS=y
 CONFIG_PCI_MSI=y

@@ -106,20 +115,24 @@ CONFIG_INPUT_JOYDEV=y
 CONFIG_INPUT_EVDEV=y
 CONFIG_KEYBOARD_GPIO=y
 CONFIG_KEYBOARD_TEGRA=y
+CONFIG_KEYBOARD_CAP11XX=y
 CONFIG_KEYBOARD_CROS_EC=y
 CONFIG_MOUSE_PS2_ELANTECH=y
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_ATMEL_MXT=y
+CONFIG_TOUCHSCREEN_ELAN=y
 CONFIG_TOUCHSCREEN_WM97XX=y
 # CONFIG_TOUCHSCREEN_WM9705 is not set
 # CONFIG_TOUCHSCREEN_WM9713 is not set
 CONFIG_TOUCHSCREEN_STMPE=y
 CONFIG_INPUT_MISC=y
+CONFIG_INPUT_GPIO_VIBRA=y
 # CONFIG_LEGACY_PTYS is not set
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SERIAL_TEGRA=y
+CONFIG_SERIAL_DEV_BUS=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_I2C_COMPAT is not set
 CONFIG_I2C_CHARDEV=y

@@ -131,10 +144,12 @@ CONFIG_SPI_TEGRA114=y
 CONFIG_SPI_TEGRA20_SFLASH=y
 CONFIG_SPI_TEGRA20_SLINK=y
 CONFIG_PINCTRL_AS3722=y
+CONFIG_PINCTRL_MAX77620=y
 CONFIG_PINCTRL_PALMAS=y
 CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_PCA953X=y
 CONFIG_GPIO_PCA953X_IRQ=y
+CONFIG_GPIO_MAX77620=y
 CONFIG_GPIO_PALMAS=y
 CONFIG_GPIO_TPS6586X=y
 CONFIG_GPIO_TPS65910=y

@@ -142,13 +157,21 @@ CONFIG_POWER_RESET=y
 CONFIG_POWER_RESET_AS3722=y
 CONFIG_POWER_RESET_GPIO=y
 CONFIG_BATTERY_SBS=y
+CONFIG_BATTERY_BQ27XXX=y
+CONFIG_CHARGER_GPIO=y
+CONFIG_CHARGER_SMB347=y
 CONFIG_CHARGER_TPS65090=y
 CONFIG_SENSORS_LM90=y
 CONFIG_SENSORS_LM95245=y
+CONFIG_THERMAL=y
+CONFIG_THERMAL_STATISTICS=y
+CONFIG_CPU_THERMAL=y
 CONFIG_WATCHDOG=y
+CONFIG_MAX77620_WATCHDOG=y
 CONFIG_TEGRA_WATCHDOG=y
 CONFIG_MFD_AS3722=y
 CONFIG_MFD_CROS_EC=y
+CONFIG_MFD_MAX77620=y
 CONFIG_MFD_MAX8907=y
 CONFIG_MFD_STMPE=y
 CONFIG_MFD_PALMAS=y

@@ -159,6 +182,7 @@ CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
 CONFIG_REGULATOR_AS3722=y
 CONFIG_REGULATOR_GPIO=y
+CONFIG_REGULATOR_MAX77620=y
 CONFIG_REGULATOR_MAX8907=y
 CONFIG_REGULATOR_PALMAS=y
 CONFIG_REGULATOR_TPS51632=y

@@ -174,7 +198,10 @@ CONFIG_USB_GSPCA=y
 CONFIG_DRM=y
 CONFIG_DRM_NOUVEAU=m
 CONFIG_DRM_TEGRA=y
+CONFIG_DRM_TEGRA_STAGING=y
+CONFIG_DRM_PANEL_LVDS=y
 CONFIG_DRM_PANEL_SIMPLE=y
+CONFIG_DRM_LVDS_CODEC=y
 # CONFIG_LCD_CLASS_DEVICE is not set
 CONFIG_BACKLIGHT_CLASS_DEVICE=y
 # CONFIG_BACKLIGHT_GENERIC is not set

@@ -238,6 +265,7 @@ CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_AS3722=y
 CONFIG_RTC_DRV_DS1307=y
 CONFIG_RTC_DRV_MAX8907=y
+CONFIG_RTC_DRV_MAX77686=y
 CONFIG_RTC_DRV_PALMAS=y
 CONFIG_RTC_DRV_TPS6586X=y
 CONFIG_RTC_DRV_TPS65910=y

@@ -259,11 +287,18 @@ CONFIG_ARCH_TEGRA_2x_SOC=y
 CONFIG_ARCH_TEGRA_3x_SOC=y
 CONFIG_ARCH_TEGRA_114_SOC=y
 CONFIG_ARCH_TEGRA_124_SOC=y
+CONFIG_PM_DEVFREQ=y
+CONFIG_ARM_TEGRA_DEVFREQ=y
+CONFIG_ARM_TEGRA20_DEVFREQ=y
 CONFIG_MEMORY=y
 CONFIG_IIO=y
+CONFIG_KXCJK1013=y
 CONFIG_MPU3050_I2C=y
+CONFIG_INV_MPU6050_I2C=y
+CONFIG_AL3010=y
 CONFIG_SENSORS_ISL29018=y
 CONFIG_SENSORS_ISL29028=y
+CONFIG_AK8974=y
 CONFIG_AK8975=y
 CONFIG_PWM=y
 CONFIG_PWM_TEGRA=y

@@ -283,6 +318,13 @@ CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_SQUASHFS=y
 CONFIG_SQUASHFS_LZO=y
 CONFIG_SQUASHFS_XZ=y
+CONFIG_PSTORE=y
+CONFIG_PSTORE_LZO_COMPRESS=y
+CONFIG_PSTORE_LZ4_COMPRESS=y
+CONFIG_PSTORE_LZ4HC_COMPRESS=y
+CONFIG_PSTORE_842_COMPRESS=y
+CONFIG_PSTORE_CONSOLE=y
+CONFIG_PSTORE_RAM=y
 CONFIG_NFS_FS=y
 CONFIG_NFS_V4=y
 CONFIG_ROOT_NFS=y

2.26.0