On Thu, 29 Aug 2019, at 16:47, Andrew Jeffery wrote:

Commit 674fa8daa8c9 ("pinctrl: aspeed-g5: Delay acquisition of regmaps")
was determined to be a partial fix to the problem of acquiring the LPC
Host Controller and GFX regmaps: The AST2500 pin controller may need to
fetch syscon regmaps during expression evaluation as well as when
setting mux state. For example, this case is hit by attempting to export
pins exposing the LPC Host Controller as GPIOs.

An optional eval() hook is added to the Aspeed pinmux operation struct
and called from aspeed_sig_expr_eval() if the pointer is set by the
SoC-specific driver. This enables the AST2500 to perform the custom
action of acquiring its regmap dependencies as required.

John Wang tested the fix on an Inspur FP5280G2 machine (AST2500-based)
where the issue was found, and I've booted the fix on Witherspoon
(AST2500) and Palmetto (AST2400) machines, and poked at relevant pins
under QEMU by forcing mux configurations via devmem before exporting
GPIOs to exercise the driver.

Fixes: 7d29ed88acbb ("pinctrl: aspeed: Read and write bits in LPC and 
GFX controllers")
Fixes: 674fa8daa8c9 ("pinctrl: aspeed-g5: Delay acquisition of regmaps")
Reported-by: John Wang <redacted>
Tested-by: John Wang <redacted>
Signed-off-by: Andrew Jeffery <redacted>

---
Hi Linus,

The timing of merging the AST2600 (g6) driver and 674fa8daa8c9 ("pinctrl:
aspeed-g5: Delay acquisition of regmaps") caused a bit of a rough spot a
few weeks back. This fix doesn't cause any such disruption - I've
developed it on top of pinctrl/fixes and back-merged the result into
pinctrl/devel to test for build breakage (via CONFIG_COMPILE_TEST to
enable all of the g4, g5 and g6 drivers). All three ASPEED pinctrl
drivers built successfully, so it should be enough to simply take this
patch through pinctrl/fixes and leave pinctrl/devel as is for the 5.4
merge window.
---

Ping? Was hoping to get this merged before 5.3 is tagged.

Andrew

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