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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 01:40:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 01:40:05 +0300
commite2701603f72cd38e99c6b1da13c8e99bc27b2f34 (patch)
treeaf55a86e0fbc26d4b19d1a2eabb41db26e7687ef /Documentation/arm
parent22629b6d9072c4e86e900306d7020ad722ae6536 (diff)
parentce14c5831364118324b10c0355dead062b9ddd40 (diff)
downloadlinux-e2701603f72cd38e99c6b1da13c8e99bc27b2f34.tar.xz
Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6
Pull documentation updates from Jonathan Corbet: "There's been a fair amount going on in the docs tree this time around, including: - Support for reproducible document builds, from Ben Hutchings and company. - The ability to automatically generate cross-reference links within a single DocBook book and embedded descriptions for large structures. From Danilo Cesar Lemes de Paula. - A new document on how to add a system call from David Drysdale. - Chameleon bus documentation from Johannes Thumshirn. ...plus the usual collection of improvements, typo fixes, and more" * tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (39 commits) Documentation, add kernel-parameters.txt entry for dis_ucode_ldr Documentation/x86: Rename IRQSTACKSIZE to IRQ_STACK_SIZE Documentation/Intel-IOMMU.txt: Modify definition of DRHD docs: update HOWTO for 3.x -> 4.x versioning kernel-doc: ignore unneeded attribute information scripts/kernel-doc: Adding cross-reference links to html documentation. DocBook: Fix non-determinstic installation of duplicate man pages Documentation: minor typo fix in mailbox.txt Documentation: describe how to add a system call doc: Add more workqueue functions to the documentation ARM: keystone: add documentation for SoCs and EVMs scripts/kernel-doc Allow struct arguments documentation in struct body SubmittingPatches: remove stray quote character Revert "DocBook: Avoid building man pages repeatedly and inconsistently" Documentation: Minor changes to men-chameleon-bus.txt Doc: fix trivial typo in SubmittingPatches MAINTAINERS: Direct Documentation/DocBook/media properly Documentation: installed man pages don't need to be executable fix Evolution submenu name in email-clients.txt Documentation: Add MCB documentation ...
Diffstat (limited to 'Documentation/arm')
-rw-r--r--Documentation/arm/Samsung/Bootloader-interface.txt15
-rw-r--r--Documentation/arm/keystone/Overview.txt73
2 files changed, 87 insertions, 1 deletions
diff --git a/Documentation/arm/Samsung/Bootloader-interface.txt b/Documentation/arm/Samsung/Bootloader-interface.txt
index b96ead9a6919..df8d4fb85939 100644
--- a/Documentation/arm/Samsung/Bootloader-interface.txt
+++ b/Documentation/arm/Samsung/Bootloader-interface.txt
@@ -15,6 +15,7 @@ executing kernel.
1. Non-Secure mode
+
Address: sysram_ns_base_addr
Offset Value Purpose
=============================================================================
@@ -28,6 +29,7 @@ Offset Value Purpose
2. Secure mode
+
Address: sysram_base_addr
Offset Value Purpose
=============================================================================
@@ -40,14 +42,25 @@ Offset Value Purpose
Address: pmu_base_addr
Offset Value Purpose
=============================================================================
-0x0800 exynos_cpu_resume AFTR
+0x0800 exynos_cpu_resume AFTR, suspend
+0x0800 mcpm_entry_point (Exynos542x with MCPM) AFTR, suspend
+0x0804 0xfcba0d10 (Magic cookie) AFTR
+0x0804 0x00000bad (Magic cookie) System suspend
0x0814 exynos4_secondary_startup (Exynos4210 r1.1) Secondary CPU boot
0x0818 0xfcba0d10 (Magic cookie, Exynos4210 r1.1) AFTR
0x081C exynos_cpu_resume (Exynos4210 r1.1) AFTR
3. Other (regardless of secure/non-secure mode)
+
Address: pmu_base_addr
Offset Value Purpose
=============================================================================
0x0908 Non-zero (only Exynos3250) Secondary CPU boot up indicator
+
+
+4. Glossary
+
+AFTR - ARM Off Top Running, a low power mode, Cortex cores and many other
+modules are power gated, except the TOP modules
+MCPM - Multi-Cluster Power Management
diff --git a/Documentation/arm/keystone/Overview.txt b/Documentation/arm/keystone/Overview.txt
new file mode 100644
index 000000000000..f17bc4c9dff9
--- /dev/null
+++ b/Documentation/arm/keystone/Overview.txt
@@ -0,0 +1,73 @@
+ TI Keystone Linux Overview
+ --------------------------
+
+Introduction
+------------
+Keystone range of SoCs are based on ARM Cortex-A15 MPCore Processors
+and c66x DSP cores. This document describes essential information required
+for users to run Linux on Keystone based EVMs from Texas Instruments.
+
+Following SoCs & EVMs are currently supported:-
+
+------------ K2HK SoC and EVM --------------------------------------------------
+
+a.k.a Keystone 2 Hawking/Kepler SoC
+TCI6636K2H & TCI6636K2K: See documentation at
+ http://www.ti.com/product/tci6638k2k
+ http://www.ti.com/product/tci6638k2h
+
+EVM:
+http://www.advantech.com/Support/TI-EVM/EVMK2HX_sd.aspx
+
+------------ K2E SoC and EVM ---------------------------------------------------
+
+a.k.a Keystone 2 Edison SoC
+K2E - 66AK2E05: See documentation at
+ http://www.ti.com/product/66AK2E05/technicaldocuments
+
+EVM:
+https://www.einfochips.com/index.php/partnerships/texas-instruments/k2e-evm.html
+
+------------ K2L SoC and EVM ---------------------------------------------------
+
+a.k.a Keystone 2 Lamarr SoC
+K2L - TCI6630K2L: See documentation at
+ http://www.ti.com/product/TCI6630K2L/technicaldocuments
+EVM:
+https://www.einfochips.com/index.php/partnerships/texas-instruments/k2l-evm.html
+
+Configuration
+-------------
+
+All of the K2 SoCs/EVMs share a common defconfig, keystone_defconfig and same
+image is used to boot on individual EVMs. The platform configuration is
+specified through DTS. Following are the DTS used:-
+ K2HK EVM : k2hk-evm.dts
+ K2E EVM : k2e-evm.dts
+ K2L EVM : k2l-evm.dts
+
+The device tree documentation for the keystone machines are located at
+ Documentation/devicetree/bindings/arm/keystone/keystone.txt
+
+Known issues & workaround
+-------------------------
+
+Some of the device drivers used on keystone are re-used from that from
+DaVinci and other TI SoCs. These device drivers may use clock APIs directly.
+Some of the keystone specific drivers such as netcp uses run time power
+management API instead to enable clock. As this API has limitations on
+keystone, following workaround is needed to boot Linux.
+
+ Add 'clk_ignore_unused' to the bootargs env variable in u-boot. Otherwise
+ clock frameworks will try to disable clocks that are unused and disable
+ the hardware. This is because netcp related power domain and clock
+ domains are enabled in u-boot as run time power management API currently
+ doesn't enable clocks for netcp due to a limitation. This workaround is
+ expected to be removed in the future when proper API support becomes
+ available. Until then, this work around is needed.
+
+
+Document Author
+---------------
+Murali Karicheri <m-karicheri2@ti.com>
+Copyright 2015 Texas Instruments