linux-kernel - [PATCH 1/7] pinctrl: sunxi: add support for pin controllers without bus gate

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Date:   Sat,  6 Jan 2018 12:23:20 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.io>
Subject: [PATCH 1/7] pinctrl: sunxi: add support for pin controllers without bus gate

The Allwinner H6 pin controllers (both the main one and the CPUs one)
have no bus gate clocks.

Add support for this kind of pin controllers.

Signed-off-by: Icenowy Zheng <icenowy@...c.io>
---
 drivers/pinctrl/sunxi/pinctrl-sunxi.c | 30 ++++++++++++++++++++----------
 drivers/pinctrl/sunxi/pinctrl-sunxi.h |  1 +
 2 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 4b6cb25bc796..68cd505679d9 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -1182,7 +1182,12 @@ static int sunxi_pinctrl_setup_debounce(struct sunxi_pinctrl *pctl,
 	unsigned int hosc_div, losc_div;
 	struct clk *hosc, *losc;
 	u8 div, src;
-	int i, ret;
+	int i, ret, clk_count;
+
+	if (pctl->desc->without_bus_gate)
+		clk_count = 2;
+	else
+		clk_count = 3;
 
 	/* Deal with old DTs that didn't have the oscillators */
 	if (of_count_phandle_with_args(node, "clocks", "#clock-cells") != 3)
@@ -1360,15 +1365,19 @@ int sunxi_pinctrl_init_with_variant(struct platform_device *pdev,
 			goto gpiochip_error;
 	}
 
-	clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		goto gpiochip_error;
-	}
+	if (!desc->without_bus_gate) {
+		clk = devm_clk_get(&pdev->dev, NULL);
+		if (IS_ERR(clk)) {
+			ret = PTR_ERR(clk);
+			goto gpiochip_error;
+		}
 
-	ret = clk_prepare_enable(clk);
-	if (ret)
-		goto gpiochip_error;
+		ret = clk_prepare_enable(clk);
+		if (ret)
+			goto gpiochip_error;
+	} else {
+		clk = NULL;
+	}
 
 	pctl->irq = devm_kcalloc(&pdev->dev,
 				 pctl->desc->irq_banks,
@@ -1425,7 +1434,8 @@ int sunxi_pinctrl_init_with_variant(struct platform_device *pdev,
 	return 0;
 
 clk_error:
-	clk_disable_unprepare(clk);
+	if (clk)
+		clk_disable_unprepare(clk);
 gpiochip_error:
 	gpiochip_remove(pctl->chip);
 	return ret;
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.h b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
index 11b128f54ed2..ccb6230f0bb5 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
@@ -113,6 +113,7 @@ struct sunxi_pinctrl_desc {
 	unsigned			irq_bank_base;
 	bool				irq_read_needs_mux;
 	bool				disable_strict_mode;
+	bool				without_bus_gate;
 };
 
 struct sunxi_pinctrl_function {
-- 
2.14.2