linux-kernel - Re: [PATCH 4/4] spi: s3c64xx: add support for google,gs101-spi

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Message-ID: <CADrjBPqaE9Mmbr+zkHOAadr3aLSu3GMjS4nPPd4VZY4s2DTznA@mail.gmail.com>
Date: Tue, 6 Feb 2024 10:12:30 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: broonie@...nel.org, andi.shyti@...nel.org, semen.protsenko@...aro.org, 
	krzysztof.kozlowski@...aro.org, alim.akhtar@...sung.com, 
	linux-spi@...r.kernel.org, linux-samsung-soc@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	andre.draszik@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com, 
	robh+dt@...nel.org, conor+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/4] spi: s3c64xx: add support for google,gs101-spi

Hi Tudor,

On Tue, 6 Feb 2024 at 08:52, Tudor Ambarus <tudor.ambarus@...aro.org> wrote:
>
> Add support for GS101 SPI. GS101 integrates 16 SPI nodes, all with 64
> bytes FIFOs. GS101 allows just 32 bit register accesses, otherwise a
> Serror Interrupt is raised. Do the write reg accesses in 32 bits.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---

The patch ordering seems a bit off with this series..I believe it should be
1) dt-bindings patch (docs first)
2) Add the use_32bit_io flag / functionality
3) gs101 support (this patch) that uses the use_32bit_io functionality

Peter.

>  drivers/spi/spi-s3c64xx.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> index cb45ad615f3d..9ad0d513fb30 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -19,7 +19,7 @@
>  #include <linux/spi/spi.h>
>  #include <linux/types.h>
>
> -#define MAX_SPI_PORTS          12
> +#define MAX_SPI_PORTS          16
>  #define S3C64XX_SPI_QUIRK_CS_AUTO      (1 << 1)
>  #define AUTOSUSPEND_TIMEOUT    2000
>
> @@ -1538,6 +1538,19 @@ static const struct s3c64xx_spi_port_config fsd_spi_port_config = {
>         .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
>  };
>
> +static const struct s3c64xx_spi_port_config gs101_spi_port_config = {
> +       .fifo_lvl_mask  = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f,
> +                           0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
> +       .rx_lvl_offset  = 15,
> +       .tx_st_done     = 25,
> +       .clk_div        = 4,
> +       .high_speed     = true,
> +       .clk_from_cmu   = true,
> +       .has_loopback   = true,
> +       .use_32bit_io   = true,
> +       .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
> +};
> +
>  static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
>         {
>                 .name           = "s3c2443-spi",
> @@ -1550,6 +1563,9 @@ static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
>  };
>
>  static const struct of_device_id s3c64xx_spi_dt_match[] = {
> +       { .compatible = "google,gs101-spi",
> +                       .data = &gs101_spi_port_config,
> +       },
>         { .compatible = "samsung,s3c2443-spi",
>                         .data = &s3c2443_spi_port_config,
>         },
> --
> 2.43.0.594.gd9cf4e227d-goog
>