[PATCH v2] spi: cadence_ospi: Add device reset via OSPI controller

[Michal Simek]

On 3/11/25 05:13, Venkatesh Yadav Abbarapu wrote:
> Add support for flash device reset via OSPI controller
> instead of using GPIO, as OSPI IP has device reset
> feature on Versal Gen2 platform. Also add compatible
> string for Versal Gen2 platform.
> 
> Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
> ---
> Changes in v2:
> - Fixed the compilation issue for phycore_am62ax_a53_defconfig.
> ---
>   drivers/spi/cadence_ospi_versal.c | 19 +++++++++++++++++++
>   drivers/spi/cadence_qspi.c        |  9 +++++++++
>   drivers/spi/cadence_qspi.h        |  3 +++
>   3 files changed, 31 insertions(+)
> 
> diff --git a/drivers/spi/cadence_ospi_versal.c b/drivers/spi/cadence_ospi_versal.c
> index 816916de16d..fbeb0c6a85c 100644
> --- a/drivers/spi/cadence_ospi_versal.c
> +++ b/drivers/spi/cadence_ospi_versal.c
> @@ -204,3 +204,22 @@ void cadence_qspi_apb_enable_linear_mode(bool enable)
>   			       ~VERSAL_OSPI_LINEAR_MODE, VERSAL_AXI_MUX_SEL);
>   	}
>   }
> +
> +int cadence_device_reset(struct udevice *bus)
> +{
> +	struct cadence_spi_priv *priv = dev_get_priv(bus);
> +	u32 reg;
> +
> +	reg = readl(priv->regbase + CQSPI_REG_CONFIG);
> +	reg |= CQSPI_REG_CONFIG_RESET_CFG_FLD_MASK;
> +	writel(reg, priv->regbase + CQSPI_REG_CONFIG);
> +
> +	writel(reg & ~CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, priv->regbase + CQSPI_REG_CONFIG);
> +	udelay(5);
> +	writel(reg | CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, priv->regbase + CQSPI_REG_CONFIG);
> +	udelay(150);
> +	writel(reg & ~CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, priv->regbase + CQSPI_REG_CONFIG);
> +	udelay(1200);
> +
> +	return 0;
> +}
> diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
> index 623904ecdad..a78c00db4ff 100644
> --- a/drivers/spi/cadence_qspi.c
> +++ b/drivers/spi/cadence_qspi.c
> @@ -33,6 +33,11 @@ __weak int cadence_qspi_apb_dma_read(struct cadence_spi_priv *priv,
>   	return 0;
>   }
>   
> +__weak int cadence_device_reset(struct udevice *dev)
> +{
> +	return 0;
> +}
> +
>   __weak int cadence_qspi_flash_reset(struct udevice *dev)
>   {
>   	return 0;
> @@ -251,6 +256,9 @@ static int cadence_spi_probe(struct udevice *bus)
>   
>   	priv->wr_delay = 50 * DIV_ROUND_UP(NSEC_PER_SEC, priv->ref_clk_hz);
>   
> +	if (device_is_compatible(bus, "amd,versal2-ospi"))
> +		return cadence_device_reset(bus);
> +
>   	/* Reset ospi flash device */
>   	return cadence_qspi_flash_reset(bus);
>   
> @@ -452,6 +460,7 @@ static const struct dm_spi_ops cadence_spi_ops = {
>   static const struct udevice_id cadence_spi_ids[] = {
>   	{ .compatible = "cdns,qspi-nor" },
>   	{ .compatible = "ti,am654-ospi" },
> +	{ .compatible = "amd,versal2-ospi" },
>   	{ }
>   };
>   
> diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
> index 1f9125cd239..731b6527cf3 100644
> --- a/drivers/spi/cadence_qspi.h
> +++ b/drivers/spi/cadence_qspi.h
> @@ -45,6 +45,8 @@
>   #define CQSPI_REG_CONFIG_CLK_POL                BIT(1)
>   #define CQSPI_REG_CONFIG_CLK_PHA                BIT(2)
>   #define CQSPI_REG_CONFIG_PHY_ENABLE_MASK        BIT(3)
> +#define CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK	BIT(5)
> +#define CQSPI_REG_CONFIG_RESET_CFG_FLD_MASK	BIT(6)
>   #define CQSPI_REG_CONFIG_DIRECT                 BIT(7)
>   #define CQSPI_REG_CONFIG_DECODE                 BIT(9)
>   #define CQSPI_REG_CONFIG_ENBL_DMA               BIT(15)
> @@ -310,5 +312,6 @@ int cadence_qspi_apb_exec_flash_cmd(void *reg_base, unsigned int reg);
>   int cadence_qspi_flash_reset(struct udevice *dev);
>   ofnode cadence_qspi_get_subnode(struct udevice *dev);
>   void cadence_qspi_apb_enable_linear_mode(bool enable);
> +int cadence_device_reset(struct udevice *dev);
>   
>   #endif /* __CADENCE_QSPI_H__ */

Applied.
M