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Date: Thu, 20 Oct 2016 17:50:02 +0200
From: Maxime Ripard <maxime.ripard@...e-electrons.com>
To: Milo Kim <woogyom.kim@...il.com>
Cc: Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] spi: sun6i: Support Allwinner H3 SPI controller
Hi,
On Wed, Oct 19, 2016 at 11:02:33PM +0900, Milo Kim wrote:
> H3 has two SPI controllers. The size of the buffer is 64 * 8.
> (8 bit transfer by 64 entry FIFO)
> A31 has four controllers. The size of the buffer is 128 * 8.
> (8 bit transfer by 128 entry FIFO)
>
> Register maps are sharable, so sun6i SPI driver is reusable with
> device configuration.
>
> Use the variable, 'fifo_depth' instead of fixed value to support both SPI
> controllers.
>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Cc: Chen-Yu Tsai <wens@...e.org>
> Signed-off-by: Milo Kim <woogyom.kim@...il.com>
> ---
> drivers/spi/Kconfig | 4 ++--
> drivers/spi/spi-sun6i.c | 38 +++++++++++++++++++++++++++-----------
> 2 files changed, 29 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index b799547..06d0845 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -610,11 +610,11 @@ config SPI_SUN4I
> SPI driver for Allwinner sun4i, sun5i and sun7i SoCs
>
> config SPI_SUN6I
> - tristate "Allwinner A31 SPI controller"
> + tristate "Allwinner A31/H3 SPI controller"
> depends on ARCH_SUNXI || COMPILE_TEST
> depends on RESET_CONTROLLER
> help
> - This enables using the SPI controller on the Allwinner A31 SoCs.
> + This enables using the SPI controller on the Allwinner A31/H3 SoCs.
Usually, we don't care about maintaining this. This is just going to
be a list that grows all the time, and is wrong most of the time.
> config SPI_MXS
> tristate "Freescale MXS SPI controller"
> diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
> index 9918a57..91235b2 100644
> --- a/drivers/spi/spi-sun6i.c
> +++ b/drivers/spi/spi-sun6i.c
> @@ -17,6 +17,7 @@
> #include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/module.h>
> +#include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> #include <linux/reset.h>
> @@ -24,6 +25,7 @@
> #include <linux/spi/spi.h>
>
> #define SUN6I_FIFO_DEPTH 128
> +#define SUN8I_FIFO_DEPTH 64
>
> #define SUN6I_GBL_CTL_REG 0x04
> #define SUN6I_GBL_CTL_BUS_ENABLE BIT(0)
> @@ -90,6 +92,7 @@ struct sun6i_spi {
> const u8 *tx_buf;
> u8 *rx_buf;
> int len;
> + int fifo_depth;
> };
>
> static inline u32 sun6i_spi_read(struct sun6i_spi *sspi, u32 reg)
> @@ -155,7 +158,9 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
>
> static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
> {
> - return SUN6I_FIFO_DEPTH - 1;
> + struct sun6i_spi *sspi = spi_master_get_devdata(spi->master);
> +
> + return sspi->fifo_depth - 1;
> }
>
> static int sun6i_spi_transfer_one(struct spi_master *master,
> @@ -170,7 +175,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
> u32 reg;
>
> /* We don't support transfer larger than the FIFO */
> - if (tfr->len > SUN6I_FIFO_DEPTH)
> + if (tfr->len > sspi->fifo_depth)
> return -EINVAL;
>
> reinit_completion(&sspi->done);
> @@ -265,7 +270,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
> SUN6I_BURST_CTL_CNT_STC(tx_len));
>
> /* Fill the TX FIFO */
> - sun6i_spi_fill_fifo(sspi, SUN6I_FIFO_DEPTH);
> + sun6i_spi_fill_fifo(sspi, sspi->fifo_depth);
>
> /* Enable the interrupts */
> sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, SUN6I_INT_CTL_TC);
> @@ -288,7 +293,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
> goto out;
> }
>
> - sun6i_spi_drain_fifo(sspi, SUN6I_FIFO_DEPTH);
> + sun6i_spi_drain_fifo(sspi, sspi->fifo_depth);
>
> out:
> sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, 0);
> @@ -360,8 +365,16 @@ static int sun6i_spi_runtime_suspend(struct device *dev)
> return 0;
> }
>
> +static const struct of_device_id sun6i_spi_match[] = {
> + { .compatible = "allwinner,sun6i-a31-spi", .data = (int *)SUN6I_FIFO_DEPTH },
> + { .compatible = "allwinner,sun8i-h3-spi", .data = (int *)SUN8I_FIFO_DEPTH },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, sun6i_spi_match);
> +
> static int sun6i_spi_probe(struct platform_device *pdev)
> {
> + const struct of_device_id *id;
> struct spi_master *master;
> struct sun6i_spi *sspi;
> struct resource *res;
> @@ -398,6 +411,15 @@ static int sun6i_spi_probe(struct platform_device *pdev)
> }
>
> sspi->master = master;
> +
> + id = of_match_device(sun6i_spi_match, &pdev->dev);
> + if (!id) {
> + dev_err(&pdev->dev, "Cannot get device ID\n");
> + goto err_free_master;
> + }
> +
> + sspi->fifo_depth = (int)id->data;
> +
> master->max_speed_hz = 100 * 1000 * 1000;
> master->min_speed_hz = 3 * 1000;
> master->set_cs = sun6i_spi_set_cs;
> @@ -469,12 +491,6 @@ static int sun6i_spi_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static const struct of_device_id sun6i_spi_match[] = {
> - { .compatible = "allwinner,sun6i-a31-spi", },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, sun6i_spi_match);
> -
> static const struct dev_pm_ops sun6i_spi_pm_ops = {
> .runtime_resume = sun6i_spi_runtime_resume,
> .runtime_suspend = sun6i_spi_runtime_suspend,
> @@ -493,5 +509,5 @@ module_platform_driver(sun6i_spi_driver);
>
> MODULE_AUTHOR("Pan Nan <pannan@...winnertech.com>");
> MODULE_AUTHOR("Maxime Ripard <maxime.ripard@...e-electrons.com>");
> -MODULE_DESCRIPTION("Allwinner A31 SPI controller driver");
> +MODULE_DESCRIPTION("Allwinner A31/H3 SPI controller driver");
Ditto.
It looks good otherwise.
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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