add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pinctrl/renesas/pinctrl-rza2.c
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@@ -14,6 +14,7 @@
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 #include <linux/gpio/driver.h>
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 #include <linux/io.h>
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 #include <linux/module.h>
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+#include <linux/mutex.h>
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 #include <linux/of_device.h>
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 #include <linux/pinctrl/pinmux.h>
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@@ -46,6 +47,7 @@
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 	struct pinctrl_dev *pctl;
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 	struct pinctrl_gpio_range gpio_range;
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 	int npins;
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+	struct mutex mutex; /* serialize adding groups and functions */
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 };
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 #define RZA2_PDR(port)		(0x0000 + (port) * 2)	/* Direction 16-bit */
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@@ -359,10 +361,14 @@
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 		psel_val[i] = MUX_FUNC(value);
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 	}
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+	mutex_lock(&priv->mutex);
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+
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 	/* Register a single pin group listing all the pins we read from DT */
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 	gsel = pinctrl_generic_add_group(pctldev, np->name, pins, npins, NULL);
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-	if (gsel < 0)
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-		return gsel;
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+	if (gsel < 0) {
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+		ret = gsel;
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+		goto unlock;
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+	}
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 	/*
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 	 * Register a single group function where the 'data' is an array PSEL
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@@ -391,6 +397,8 @@
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 	(*map)->data.mux.function = np->name;
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 	*num_maps = 1;
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+	mutex_unlock(&priv->mutex);
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+
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 	return 0;
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 remove_function:
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@@ -398,6 +406,9 @@
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 remove_group:
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 	pinctrl_generic_remove_group(pctldev, gsel);
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+
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+unlock:
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+	mutex_unlock(&priv->mutex);
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 	dev_err(priv->dev, "Unable to parse DT node %s\n", np->name);
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@@ -474,6 +485,8 @@
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 	if (IS_ERR(priv->base))
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 		return PTR_ERR(priv->base);
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+	mutex_init(&priv->mutex);
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+
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 	platform_set_drvdata(pdev, priv);
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 	priv->npins = (int)(uintptr_t)of_device_get_match_data(&pdev->dev) *