linux-kernel - [PATCH 2/3] pinctrl: msm: Mux out gpio function with gpio

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Date:   Mon, 18 Jun 2018 13:52:54 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Doug Anderson <dianders@...omium.org>
Subject: [PATCH 2/3] pinctrl: msm: Mux out gpio function with gpio_request()

We rely on devices to use pinmuxing configurations in DT to select the
GPIO function (function 0) if they're going to use the gpio in GPIO
mode. Let's simplify things for driver authors by implementing
gpio_request_enable() for this pinctrl driver to mux out the GPIO
function when the gpio is use from gpiolib.

Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Doug Anderson <dianders@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/pinctrl/qcom/pinctrl-msm.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 3563c4394837..eacfc5b85f7f 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -176,11 +176,27 @@ static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
+static int msm_pinmux_request_gpio(struct pinctrl_dev *pctldev,
+				   struct pinctrl_gpio_range *range,
+				   unsigned offset)
+{
+	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+	const struct msm_pingroup *g = &pctrl->soc->groups[offset];
+
+	/* No funcs? Probably ACPI so can't do anything here */
+	if (!g->nfuncs)
+		return 0;
+
+	/* For now assume function 0 is GPIO because it always is */
+	return msm_pinmux_set_mux(pctldev, 0, offset);
+}
+
 static const struct pinmux_ops msm_pinmux_ops = {
 	.request		= msm_pinmux_request,
 	.get_functions_count	= msm_get_functions_count,
 	.get_function_name	= msm_get_function_name,
 	.get_function_groups	= msm_get_function_groups,
+	.gpio_request_enable	= msm_pinmux_request_gpio,
 	.set_mux		= msm_pinmux_set_mux,
 };
 
-- 
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