On Thu, Feb 06, 2020 at 04:44:42PM +0800, Chuanhong Guo wrote:

This looks good, just a couple of comments below:

> --- /dev/null
> +++ b/drivers/spi/spi-ar934x.c
> @@ -0,0 +1,230 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * SPI controller driver for Qualcomm Atheros AR934x/QCA95xx SoCs

Please make the entire comment block a C++ one so things look
more intentional.

> +static int ar934x_spi_transfer_one(struct spi_controller *master,
> +				   struct spi_message *m)
> +{
> +	struct ar934x_spi *sp = spi_controller_get_devdata(master);
> +	struct spi_transfer *t = NULL;

...

> +
> +	m->actual_length = 0;
> +	list_for_each_entry(t, &m->transfers, transfer_list) {

It looks like this could just be a transfer_one() operation
instead of transfer_one_message() (which is what this is in spite
of the name)?  There's nothing custom outside this loop that I
can see.