Re: [PATCH 2/3 v3] gpio: Handle counting of Freescale chipselects

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Le 28/11/2019 à 09:37, Linus Walleij a écrit :
We have a special quirk to handle the Freescale
nonstandard SPI chipselect GPIOs in the gpiolib-of.c
file, but it currently only handles the case where
the GPIOs are actually requested (gpiod_*get()).

We also need to handle that the SPI core attempts
to count the GPIOs before use, and that needs a
similar quirk in the OF part of the library.

Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Reported-by: Christophe Leroy <christophe.leroy@xxxxxx>
Fixes: 0f0581b24bd0 ("spi: fsl: Convert to use CS GPIO descriptors")
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Tested-by: Christophe Leroy <christophe.leroy@xxxxxx>

---
ChangeLog v2->v3:
- Fixed the bug (I hope) as I was counting the number
   of gpios by checking for "gpios-gpios" and "gpios-gpio"
   rather than "gpios" (ehm...)
ChangeLog v1->v2:
- Hardcode the quirk to look for "gpios" as this is all
   we support and else the call would just recurse back
   and fail again.
- Provide a proper NULL check so we don't upset strcmp().

Mark: I change my mind, better to keep the patches
together, once Christophe has it working with my
patch stack let's just merge all of it.
---
  drivers/gpio/gpiolib-of.c | 27 +++++++++++++++++++++++++++
  1 file changed, 27 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 80ea49f570f4..43ffec3a6fbb 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -23,6 +23,29 @@
  #include "gpiolib.h"
  #include "gpiolib-of.h"
+/**
+ * of_gpio_spi_cs_get_count() - special GPIO counting for SPI
+ * Some elder GPIO controllers need special quirks. Currently we handle
+ * the Freescale GPIO controller with bindings that doesn't use the
+ * established "cs-gpios" for chip selects but instead rely on
+ * "gpios" for the chip select lines. If we detect this, we redirect
+ * the counting of "cs-gpios" to count "gpios" transparent to the
+ * driver.
+ */
+int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id)
+{
+	struct device_node *np = dev->of_node;
+
+	if (!IS_ENABLED(CONFIG_SPI_MASTER))
+		return 0;
+	if (!con_id || strcmp(con_id, "cs"))
+		return 0;
+	if (!of_device_is_compatible(np, "fsl,spi") &&
+	    !of_device_is_compatible(np, "aeroflexgaisler,spictrl"))
+		return 0;
+	return of_gpio_named_count(np, "gpios");
+}
+
  /*
   * This is used by external users of of_gpio_count() from <linux/of_gpio.h>
   *
@@ -35,6 +58,10 @@ int of_gpio_get_count(struct device *dev, const char *con_id)
  	char propname[32];
  	unsigned int i;
+ ret = of_gpio_spi_cs_get_count(dev, con_id);
+	if (ret > 0)
+		return ret;
+
  	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
  		if (con_id)
  			snprintf(propname, sizeof(propname), "%s-%s",




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