From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Timur Tabi <timur@codeaurora.org>,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
Linus Walleij <linus.walleij@linaro.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
thierry.reding@gmail.com, Stephen Boyd <sboyd@codeaurora.org>,
david.brown@linaro.org, andy.gross@linaro.org,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Varadarajan Narayanan <varada@codeaurora.org>,
Archit Taneja <architt@codeaurora.org>
Subject: Re: [PATCH 3/3] [v5] pinctrl: qcom: qdf2xxx: add support for new ACPI HID QCOM8002
Date: Wed, 13 Dec 2017 16:43:05 +0200 [thread overview]
Message-ID: <1513176185.7000.22.camel@linux.intel.com> (raw)
In-Reply-To: <1513111858-6251-4-git-send-email-timur@codeaurora.org>
On Tue, 2017-12-12 at 14:50 -0600, Timur Tabi wrote:
> Newer versions of the firmware for the Qualcomm Datacenter
> Technologies
> QDF2400 restricts access to a subset of the GPIOs on the TLMM. To
> prevent older kernels from accidentally accessing the restricted
> GPIOs,
> we change the ACPI HID for the TLMM block from QCOM8001 to QCOM8002,
> and introduce a new property "gpios". This property is an array of
> specific GPIOs that are accessible. When an older kernel boots on
> newer (restricted) firmware, it will fail to probe.
>
> To implement the sparse GPIO map, we register all of the GPIOs, but
> set
> the pin count for the unavailable GPIOs to zero. The pinctrl-msm
> driver will block those unavailable GPIOs from being accessed.
>
> To allow newer kernels to support older firmware, the driver retains
> support for QCOM8001.
Please, read my comments to v8, same applies here.
--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy
prev parent reply other threads:[~2017-12-13 14:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-12 20:50 [PATCH 0/3] [v9] pinctrl: qcom: add support for sparse GPIOs Timur Tabi
2017-12-12 20:50 ` [PATCH 1/3] [v2] Revert "gpio: set up initial state from .get_direction()" Timur Tabi
2017-12-12 20:50 ` [PATCH 2/3] [v8] pinctrl: qcom: disable GPIO groups with no pins Timur Tabi
2017-12-13 14:42 ` Andy Shevchenko
2017-12-12 20:50 ` [PATCH 3/3] [v5] pinctrl: qcom: qdf2xxx: add support for new ACPI HID QCOM8002 Timur Tabi
2017-12-13 14:43 ` Andy Shevchenko [this message]
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