SPEAr platforms now support DT and so must convert all drivers to support
DT.  This patch adds DT probing support for SPEAr thermal sensor driver
and updates its documentation too.

Also, as SPEAr is the only user of this driver and is only available with
DT, make this an only DT driver.  So, platform_data is completely removed
and passed via DT now.
Signed-off-by: NViresh Kumar <viresh.kumar@st.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NVincenzo Frascino <vincenzo.frascino@st.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLen Brown <len.brown@intel.com>

thermal_zone_device_register() never returns NULL, on error it returns and
ERR_PTR().
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NViresh Kumar <viresh.kumar@st.com>
Reviewed-by: NVincenzo Frascino <vincenzo.frascino@st.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLen Brown <len.brown@intel.com>

readl/writel versions for ARM contain memory barrier instruction for
synchronizing DMA buffers.  These are not required at least on this
module.  So use lighter _relaxed variants.
Signed-off-by: NViresh Kumar <viresh.kumar@st.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLen Brown <len.brown@intel.com>

ST's SPEAr13xx machines are based on CortexA9 ARM processors.  These
machines contain a thermal sensor for junction temperature monitoring.

This patch adds support for this thermal sensor in existing thermal
framework.

[akpm@linux-foundation.org: little code cleanup]
[akpm@linux-foundation.org: print the pointer correctly]
[viresh.kumar@st.com: thermal/spear_thermal: add compilation dependency on PLAT_SPEAR]
Signed-off-by: NVincenzo Frascino <vincenzo.frascino@st.com>
Signed-off-by: NViresh Kumar <viresh.kumar@st.com>
Signed-off-by: NViresh Kumar <viresh.kumar@st.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLen Brown <len.brown@intel.com>