linux-kernel - Re: [PATCH v2 0/3] Support qcom pinctrl protected pins

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Date:   Tue, 20 Feb 2018 10:45:03 -0600
From:   Timur Tabi <timur@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-gpio@...r.kernel.org,
        Grant Likely <grant.likely@...retlab.ca>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Support qcom pinctrl protected pins

On 01/25/2018 07:13 PM, Stephen Boyd wrote:
> This patchset proposes a solution to describing the valid
> pins for a pin controller in a semi-generic way so that qcom
> platforms can expose the pins that are really available.
> 
> Typically, this has been done by having drivers and firmware
> descriptions only use pins they know they have access to, and that
> still works now because we no longer read the pin direction at
> boot. But there are still some userspace drivers and debugfs facilities
> that don't know what pins are available and attempt to read everything
> they can. On qcom platforms, this may lead to a system hang, which isn't
> very nice behavior, even if root is the only user that can trigger it.

Any progress on this patch set?  Stephen no longer works for Qualcomm, 
so I don't know what the next step is, and I really want this feature in 
4.17 (we've missed so many merge windows already).

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.