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From: Stephen Boyd <sboyd@codeaurora.org>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Timur Tabi <timur@codeaurora.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-gpio@vger.kernel.org, devicetree@vger.kernel.org
Subject: [PATCH 2/3] dt-bindings: pinctrl: Add a ngpios-ranges property
Date: Tue,  9 Jan 2018 17:58:47 -0800	[thread overview]
Message-ID: <20180110015848.11480-3-sboyd@codeaurora.org> (raw)
In-Reply-To: <20180110015848.11480-1-sboyd@codeaurora.org>

Some qcom platforms make some GPIOs or pins unavailable for use
by non-secure operating systems, and thus reading or writing the
registers for those pins will cause access control issues.
Introduce a DT property to describe the set of GPIOs that are
available for use so that higher level OSes are able to know what
pins to avoid reading/writing.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---

I stuck this inside msm8996, but maybe it can go somewhere more generic?

 Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
index aaf01e929eea..8354ab270486 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
@@ -40,6 +40,12 @@ MSM8996 platform.
 	Definition: must be 2. Specifying the pin number and flags, as defined
 		    in <dt-bindings/gpio/gpio.h>
 
+- ngpios-ranges:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: Tuples of GPIO ranges (base, size) indicating
+		    GPIOs available for use.
+
 Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
 a general description of GPIO and interrupt bindings.
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

  parent reply	other threads:[~2018-01-10  1:58 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-10  1:58 [PATCH 0/3] Support qcom pinctrl protected pins Stephen Boyd
     [not found] ` <20180110015848.11480-1-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10  1:58   ` [PATCH 1/3] gpiolib: Export gpiochip_irqchip_irq_valid() to drivers Stephen Boyd
2018-01-10  6:16     ` Bjorn Andersson
2018-01-10 13:22     ` Linus Walleij
2018-01-10  1:58 ` Stephen Boyd [this message]
2018-01-10 12:54   ` [PATCH 2/3] dt-bindings: pinctrl: Add a ngpios-ranges property Andy Shevchenko
     [not found]   ` <20180110015848.11480-3-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-01-10 13:37     ` Linus Walleij
2018-01-10 16:37       ` Stephen Boyd
2018-01-10 17:59         ` Andy Shevchenko
2018-01-11 16:33       ` Grant Likely
2018-01-11 16:36         ` Timur Tabi
2018-01-11 19:56           ` Grant Likely
2018-01-10  1:58 ` [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested Stephen Boyd
2018-01-10  6:11   ` Bjorn Andersson
2018-01-22 13:55   ` Timur Tabi
2018-01-22 20:03     ` Timur Tabi
2018-01-25 21:51     ` Stephen Boyd
2018-01-25 21:53       ` Timur Tabi
2018-01-25 20:48   ` Timur Tabi

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