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Thu, 14 Apr 2022 12:43:54 -0700 (PDT) Date: Thu, 14 Apr 2022 12:44:40 -0700 From: Drew Fustini To: Rob Herring , Krzysztof Kozlowski Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Nishanth Menon , Santosh Shilimkar , Dave Gerlach , Tony Lindgren Subject: Re: [PATCH v3 1/2] dt-bindings: wkup-m3-ipc: Add ti, set-io-isolation property Message-ID: References: <20220414192722.2978837-1-dfustini@baylibre.com> <20220414192722.2978837-2-dfustini@baylibre.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220414192722.2978837-2-dfustini@baylibre.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220414_124358_889803_0956BA5F X-CRM114-Status: GOOD ( 28.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Apr 14, 2022 at 12:27:23PM -0700, Drew Fustini wrote: > Add documentation for the ti,set-io-isolation DT property on the wkup_m3_ipc > node which tells the wkup_m3_ipc driver to use the wkup_m3 to enable > IO Isolation during low power mode transitions on am43xx platforms. > > Signed-off-by: Dave Gerlach > [dfustini: convert to YAML, make DTS example that passes check] > Signed-off-by: Drew Fustini > --- > Changes from v2: > - correct indentation of the 'allOf:' block > > Changes from v1: > - correct typo of 'ti,set-io-isolation' property in subject > - make 'ti,set-io-isolation' only valid for 'ti,am4372-wkup-m3-ipc' > > .../bindings/soc/ti/wkup-m3-ipc.yaml | 78 +++++++++++++++++-- > 1 file changed, 73 insertions(+), 5 deletions(-) > > diff --git a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > index 7f4a75c5fcaa..f0ae86250fe4 100644 > --- a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > +++ b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > @@ -24,14 +24,22 @@ description: |+ > A wkup_m3_ipc device node is used to represent the IPC registers within an > SoC. > > - Support for VTT Toggle > - ================================== > + Support for VTT Toggle with GPIO pin > + ==================================== > On some boards like the AM335x EVM-SK and the AM437x GP EVM, a GPIO pin is > connected to the enable pin on the DDR VTT regulator. This allows the > regulator to be disabled upon suspend and enabled upon resume. Please note > that the GPIO pin must be part of the GPIO0 module as only this GPIO module > is in the wakeup power domain. > > + Support for IO Isolation > + ======================== > + On AM437x SoCs, certain pins can be forced into an alternate state when IO > + isolation is activated. Those pins have pad control registers prefixed by > + 'CTRL_CONF_' that contain DS0 (e.g. deep sleep) configuration bits that can > + override the pin's existing bias (pull-up/pull-down) and value (high/low) when > + IO isolation is active. > + > properties: > compatible: > enum: > @@ -63,6 +71,24 @@ properties: > $ref: /schemas/types.yaml#/definitions/uint32 > description: GPIO pin connected to enable pin on VTT regulator > > + ti,set-io-isolation: > + type: boolean > + description: > + If this property is present, then the wkup_m3_ipc driver will instruct > + the CM3 firmware to activate IO isolation when suspending to deep sleep. > + This can be leveraged by a board design to put other devices on the board > + into a low power state. > +allOf: Rob - sorry for the churn. I realize now that there should have been a blank line before 'allOf:'. Should I send a v4 or (if there are not other issues) could that just added when applying? Thank you, Drew _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel