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gpio: of: Handle the Freescale SPI CS
The Freescale SPI chipselects are special: while everyone else is using "cs-gpios" the Freescale platforms just use "gpios". Fix this by responding with "gpios" when asking for "cs-gpios" in a freescale device node, so we hide this pecularity from the SPI core. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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1 changed files with 37 additions and 0 deletions
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@ -254,6 +254,37 @@ static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id
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return desc;
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}
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/*
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* The old Freescale bindings use simply "gpios" as name for the chip select
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* lines rather than "cs-gpios" like all other SPI hardware. Account for this
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* with a special quirk.
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*/
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static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev,
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const char *con_id,
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unsigned int idx,
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unsigned long *flags)
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{
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struct device_node *np = dev->of_node;
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if (!IS_ENABLED(CONFIG_SPI_MASTER))
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return ERR_PTR(-ENOENT);
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/* Allow this specifically for Freescale devices */
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if (!of_device_is_compatible(np, "fsl,spi") &&
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!of_device_is_compatible(np, "aeroflexgaisler,spictrl"))
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return ERR_PTR(-ENOENT);
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/* Allow only if asking for "cs-gpios" */
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if (!con_id || strcmp(con_id, "cs"))
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return ERR_PTR(-ENOENT);
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/*
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* While all other SPI controllers use "cs-gpios" the Freescale
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* uses just "gpios" so translate to that when "cs-gpios" is
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* requested.
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*/
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return of_find_gpio(dev, NULL, idx, flags);
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}
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/*
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* Some regulator bindings happened before we managed to establish that GPIO
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* properties should be named "foo-gpios" so we have this special kludge for
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@ -325,6 +356,12 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
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/* Special handling for SPI GPIOs if used */
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if (IS_ERR(desc))
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desc = of_find_spi_gpio(dev, con_id, &of_flags);
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if (IS_ERR(desc)) {
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/* This quirk looks up flags and all */
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desc = of_find_spi_cs_gpio(dev, con_id, idx, flags);
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if (!IS_ERR(desc))
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return desc;
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}
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/* Special handling for regulator GPIOs if used */
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if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
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