spi: sunxi: drop max_hz handling

The driver is trying to read the "spi-max-frequency" property of the
*controller* driver node. There is no such property. The
"spi-max-frequency" property belongs to the SPI devices on the bus.

Right now, the driver will always fall back to the default value of 1MHz
and thus flash reads are very slow with just about 215kb/s.

In fact, the SPI uclass will already take care of everything and we just
have to clamp the frequency to the values the driver/hardware supports.
Thus, drop the whole max_hz handling.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>

diff --git a/drivers/spi/spi-sunxi.c b/drivers/spi/spi-sunxi.c
index 13725ee7a2dca6c014700b6e003406848308dadd..a7333d8d9c0c0f3435e22e1a50870614725b6f0b 100644 (file)
--- a/drivers/spi/spi-sunxi.c
+++ b/drivers/spi/spi-sunxi.c
@@ -135,7 +135,6 @@ struct sun4i_spi_variant {
 struct sun4i_spi_plat {
        struct sun4i_spi_variant *variant;
        u32 base;
-       u32 max_hz;
 };
 
 struct sun4i_spi_priv {
@@ -237,6 +236,13 @@ static void sun4i_spi_set_speed_mode(struct udevice *dev)
        unsigned int div;
        u32 reg;
 
+       /*
+        * The uclass should take care that this won't happen. But anyway,
+        * avoid a div-by-zero exception.
+        */
+       if (!priv->freq)
+               return;
+
        /*
         * Setup clock divider.
         *
@@ -401,11 +407,10 @@ static int sun4i_spi_xfer(struct udevice *dev, unsigned int bitlen,
 
 static int sun4i_spi_set_speed(struct udevice *dev, uint speed)
 {
-       struct sun4i_spi_plat *plat = dev_get_plat(dev);
        struct sun4i_spi_priv *priv = dev_get_priv(dev);
 
-       if (speed > plat->max_hz)
-               speed = plat->max_hz;
+       if (speed > SUN4I_SPI_MAX_RATE)
+               speed = SUN4I_SPI_MAX_RATE;
 
        if (speed < SUN4I_SPI_MIN_RATE)
                speed = SUN4I_SPI_MIN_RATE;
@@ -458,7 +463,6 @@ static int sun4i_spi_probe(struct udevice *bus)
 
        priv->variant = plat->variant;
        priv->base = plat->base;
-       priv->freq = plat->max_hz;
 
        return 0;
 }
@@ -466,16 +470,9 @@ static int sun4i_spi_probe(struct udevice *bus)
 static int sun4i_spi_of_to_plat(struct udevice *bus)
 {
        struct sun4i_spi_plat *plat = dev_get_plat(bus);
-       int node = dev_of_offset(bus);
 
        plat->base = dev_read_addr(bus);
        plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);
-       plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,
-                                     "spi-max-frequency",
-                                     SUN4I_SPI_DEFAULT_RATE);
-
-       if (plat->max_hz > SUN4I_SPI_MAX_RATE)
-               plat->max_hz = SUN4I_SPI_MAX_RATE;
 
        return 0;
 }