SK-AM62B-P1: AM62 SPIDEV clock log problem?

Hi Rio,

if you search for this message in the Kernel source...

Rio Chan said:

[   18.692337] spi spi1.0: setup mode 0, 8 bits/w, 16666666 Hz max --> 0

...like this...

a0797059@jiji:~/git/linux (ti-linux-6.6.y)
$ git grep -C 10 'setup mode.*max'
drivers/spi/spi.c-
drivers/spi/spi.c-      mutex_unlock(&spi->controller->io_mutex);
drivers/spi/spi.c-
drivers/spi/spi.c-      if (spi->rt && !spi->controller->rt) {
drivers/spi/spi.c-              spi->controller->rt = true;
drivers/spi/spi.c-              spi_set_thread_rt(spi->controller);
drivers/spi/spi.c-      }
drivers/spi/spi.c-
drivers/spi/spi.c-      trace_spi_setup(spi, status);
drivers/spi/spi.c-
drivers/spi/spi.c:      dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n",
drivers/spi/spi.c-                      spi->mode & SPI_MODE_X_MASK,
drivers/spi/spi.c-                      (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
drivers/spi/spi.c-                      (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "",
drivers/spi/spi.c-                      (spi->mode & SPI_3WIRE) ? "3wire, " : "",
drivers/spi/spi.c-                      (spi->mode & SPI_LOOP) ? "loopback, " : "",
drivers/spi/spi.c-                      spi->bits_per_word, spi->max_speed_hz,
drivers/spi/spi.c-                      status);
drivers/spi/spi.c-
drivers/spi/spi.c-      return status;
drivers/spi/spi.c-}

...you see that the '--> 0' means the status/return value of an operation was zero, which in the Linux kernel world means no error.

However this being said, are you really trying to set the SPI frequency to 166MHz?? Note that 50MHz is the datasheet limit I think; don't go higher than that (and to get to real 50MHz you need to set the SPI module input clock frequency from 166MHz to 200MHz due to the integer clock dividers implemented in HW.

Regards, Andreas