Re: [PATCH v2 2/3] soc: brcmstb: Add Bus Interface Unit control setup

Broadcom STB SoCs (brcmstb) require an early setup of their Bus
Interface Unit control register, this needs to happen before SMP is
brought up because it affects how the CPU complex will be interfaced to
the memory controller.

Add support code which properly initializes the BIU registers based on
whether "brcm,write-pairing" is present in Device Tree, and take care of
saving and restoring credit register settings during system-wide
suspend/resume operations.

Signed-off-by: Florian Fainelli <redacted>
---
Changes in v2:

- add a pr_fmt prefix which is more descriptive

 drivers/soc/brcmstb/Makefile        |   2 +-
 drivers/soc/brcmstb/biuctrl.c       | 119 ++++++++++++++++++++++++++++++++++++
 include/linux/soc/brcmstb/brcmstb.h |  10 +++
 3 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/brcmstb/biuctrl.c
 create mode 100644 include/linux/soc/brcmstb/brcmstb.h

[...]

diff --git a/drivers/soc/brcmstb/biuctrl.c b/drivers/soc/brcmstb/biuctrl.c
new file mode 100644
index 000000000000..1d4deada1c4d
--- /dev/null
+++ b/drivers/soc/brcmstb/biuctrl.c

@@ -0,0 +1,119 @@

[...]
+int __init brcmstb_biuctrl_init(void)
+{
+       int ret = 0;
+
+       ret = setup_hifcpubiuctrl_regs();
+       if (ret)
+               return ret;
+
+       ret = mcp_write_pairing_set();
+       if (ret) {
+               pr_err("MCP: Unable to disable write pairing!\n");
+               return ret;