soc-tools: Update README.md install section

Document some more of the dependencies.

Signed-off-by: Linus Walleij <linusw@kernel.org>

README.md

diff --git a/README.md b/README.md
index 30850b0..5e983ec 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,39 @@
 
 ## Installation
 
-1. Go to the "soc" Linux kernel repository.
-2. path/soc-tools/install.sh
+1. Clone the SoC kernel tree using SSH so you get an authenticated
+   and writeable origin:
+   git clone ssh://git@gitolite.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
+2. Clone soc-tools:
+   git clone git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc-tools.git
+3. Clone next-analysis:
+   git clone https://github.com/krzk/next-analysis.git
+4. Go to the "soc" Linux kernel repository.
+5. Link the tool trees into your source tree for convenience:
+   ln -s /path/to/soc-tools soc-tools
+   ln -s /path/to/next-analysis next-analysis
+6. soc-tools/install.sh to install the git hooks
+7. Install tools used by the maintainer scripts:
+   pipx install --user pwclient
+   apt-get install / dnf -y mutt
+8. Put the required configuration into $HOME/.pwclientrc
+   something like:
+   --------8<----------8<---------
+   [options]
+   default = linux-soc
+
+   [linux-soc]
+   backend = rest
+   url = https://patchwork.kernel.org/api/1.2/
+   project = linux-soc
+   token = 123456789abcdef...
+   --------8<----------8<---------
+   The token is obtained from the kernel.org patchwork web UI, righ hand
+   user drop-down, "View profile", "Authentication" shows the API token
+   for your user.
+9. In addition to this you need build scripts to build each target SoC
+   architecture for testing. People use different things and different
+   compilers (GCC or LLVM/Clang).
 
 ## Uninstallation