[PATCH 0/2] pinctrl: qcom: Allow eGPIO ownership independent of the mux function

[Pankaj Patil]

eGPIO capable TLMM pins can be handed over to a remote subsystem,
which then drives the pin instead of the application processor. The
eGPIO present bit describes whether a pin is capable of being owned
remotely and the enable bit selects the owner; neither is tied to the
pin's mux function.

The only way to express this today is to select the virtual "egpio"
function which transfers the ownership to remote io whereas the 
single-valued "function" property e.g - gpio, qup0_se0 claim the
ownership for APPS. There is no way to describe both the pin's normal mux
function and enable remote ownership where as the hardware programming
guide(HPG) mentions no such exclusion. Boards that need a pin muxed to
it's real function while the remote subsystem drives it is permitted
behavior according to the HPG.

This series adds a "qcom,remote-owned" boolean flag to the TLMM pin
configuration, describing ownership on its own. Its presence
hands the listed pins to their remote owner, and its absence leaves the
ownership to APPS.

cam_sensor_suspend_rst4: cam-sensor-suspend-rst4 {
		/* RESET REAR */
		config {
			pins = "gpio239";
			bias-pull-down; /* PULL DOWN */
			drive-strength = <12>; /* 12 MA */
			output-low;
			qcom,remote-owned;
		};

		mux {
			pins = "gpio239";
			function = "gpio";
		};
	};

Pinconf-generic emits the mux mapping ahead of the config
mapping, the flag is applied after msm_pinmux_set_mux() has
claimed the pin, so the combination above ends up muxed to gpio and owned
remotely.

Signed-off-by: Pankaj Patil <pankaj.patil@xxxxxxxxxxxxxxxx>
---
Pankaj Patil (2):
      dt-bindings: pinctrl: qcom: Add qcom,remote-owned for ownership update
      pinctrl: qcom: Add qcom,remote-owned pin configuration support

 .../bindings/pinctrl/qcom,tlmm-common.yaml         |  7 ++
 drivers/pinctrl/qcom/pinctrl-msm.c                 | 81 +++++++++++++++++++---
 2 files changed, 80 insertions(+), 8 deletions(-)
---
base-commit: d6bcfc94eb4da6e089c5473970cd96727292fd97
change-id: 20261102-egpio_fix-ddf4c2a4f24e

Best regards,
-- 
Pankaj Patil <pankaj.patil@xxxxxxxxxxxxxxxx>