add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/drivers/gpio/gpio-ts4900.c
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@@ -1,7 +1,7 @@
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 /*
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  * Digital I/O driver for Technologic Systems I2C FPGA Core
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  *
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- * Copyright (C) 2015 Technologic Systems
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+ * Copyright (C) 2015, 2018 Technologic Systems
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  * Copyright (C) 2016 Savoir-Faire Linux
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  *
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  * This program is free software; you can redistribute it and/or
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@@ -44,7 +44,10 @@
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 	regmap_read(priv->regmap, offset, &reg);
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-	return !(reg & TS4900_GPIO_OE);
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+	if (reg & TS4900_GPIO_OE)
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+		return GPIO_LINE_DIRECTION_OUT;
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+
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+	return GPIO_LINE_DIRECTION_IN;
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 }
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 static int ts4900_gpio_direction_input(struct gpio_chip *chip,
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@@ -52,19 +55,33 @@
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 {
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 	struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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-	/*
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-	 * This will clear the output enable bit, the other bits are
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-	 * dontcare when this is cleared
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+	/* Only clear the OE bit here, requires a RMW. Prevents potential issue
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+	 * with OE and data getting to the physical pin at different times.
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 	 */
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-	return regmap_write(priv->regmap, offset, 0);
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+	return regmap_update_bits(priv->regmap, offset, TS4900_GPIO_OE, 0);
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 }
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 static int ts4900_gpio_direction_output(struct gpio_chip *chip,
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 					unsigned int offset, int value)
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 {
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 	struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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+	unsigned int reg;
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 	int ret;
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+	/* If changing from an input to an output, we need to first set the
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+	 * proper data bit to what is requested and then set OE bit. This
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+	 * prevents a glitch that can occur on the IO line
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+	 */
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+	regmap_read(priv->regmap, offset, &reg);
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+	if (!(reg & TS4900_GPIO_OE)) {
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+		if (value)
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+			reg = TS4900_GPIO_OUT;
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+		else
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+			reg &= ~TS4900_GPIO_OUT;
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+
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+		regmap_write(priv->regmap, offset, reg);
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+	}
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+
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 	if (value)
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 		ret = regmap_write(priv->regmap, offset, TS4900_GPIO_OE |
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 							 TS4900_GPIO_OUT);