[PATCH 1/2] PCI: API changes for multi-port controller support

[Manivannan Sadhasivam]

On Mon, Jan 05, 2026 at 05:57:54PM +0530, Sumit Kumar wrote:
> For multi-port controllers, equalization preset properties should be
> specified in individual root port nodes rather than the controller node,

s/root port/Root Port

- Mani

> allowing each port to have its own configuration.
> 
> Change of_pci_get_equalization_presets() to accept a device_node pointer.
> This allows parsing equalization presets from any device tree node,
> which is needed for multi-port PCIe controllers.
> 
> Signed-off-by: Sumit Kumar <sumit.kumar at oss.qualcomm.com>
> ---
>  drivers/pci/of.c  | 6 ++++--
>  drivers/pci/pci.h | 2 ++
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index 3579265f119845637e163d9051437c89662762f8..d09eff40b523c920c9ca3eaa64f784765b3c5bf8 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -971,6 +971,7 @@ EXPORT_SYMBOL_GPL(of_pci_get_slot_power_limit);
>   * of_pci_get_equalization_presets - Parses the "eq-presets-Ngts" property.
>   *
>   * @dev: Device containing the properties.
> + * @node: Device tree node containing the properties.
>   * @presets: Pointer to store the parsed data.
>   * @num_lanes: Maximum number of lanes supported.
>   *
> @@ -981,6 +982,7 @@ EXPORT_SYMBOL_GPL(of_pci_get_slot_power_limit);
>   * errno otherwise.
>   */
>  int of_pci_get_equalization_presets(struct device *dev,
> +				    struct device_node *node,
>  				    struct pci_eq_presets *presets,
>  				    int num_lanes)
>  {
> @@ -988,7 +990,7 @@ int of_pci_get_equalization_presets(struct device *dev,
>  	int ret;
>  
>  	presets->eq_presets_8gts[0] = PCI_EQ_RESV;
> -	ret = of_property_read_u16_array(dev->of_node, "eq-presets-8gts",
> +	ret = of_property_read_u16_array(node, "eq-presets-8gts",
>  					 presets->eq_presets_8gts, num_lanes);
>  	if (ret && ret != -EINVAL) {
>  		dev_err(dev, "Error reading eq-presets-8gts: %d\n", ret);
> @@ -998,7 +1000,7 @@ int of_pci_get_equalization_presets(struct device *dev,
>  	for (int i = 0; i < EQ_PRESET_TYPE_MAX - 1; i++) {
>  		presets->eq_presets_Ngts[i][0] = PCI_EQ_RESV;
>  		snprintf(name, sizeof(name), "eq-presets-%dgts", 8 << (i + 1));
> -		ret = of_property_read_u8_array(dev->of_node, name,
> +		ret = of_property_read_u8_array(node, name,
>  						presets->eq_presets_Ngts[i],
>  						num_lanes);
>  		if (ret && ret != -EINVAL) {
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 34f65d69662e9f61f0c489ec58de2ce17d21c0c6..72fa6db95b8a75f6e69b8019d1eb2262b6a46c13 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -965,6 +965,7 @@ void pci_release_bus_of_node(struct pci_bus *bus);
>  int devm_of_pci_bridge_init(struct device *dev, struct pci_host_bridge *bridge);
>  bool of_pci_supply_present(struct device_node *np);
>  int of_pci_get_equalization_presets(struct device *dev,
> +				    struct device_node *node,
>  				    struct pci_eq_presets *presets,
>  				    int num_lanes);
>  #else
> @@ -1013,6 +1014,7 @@ static inline bool of_pci_supply_present(struct device_node *np)
>  }
>  
>  static inline int of_pci_get_equalization_presets(struct device *dev,
> +						  struct device_node *node,
>  						  struct pci_eq_presets *presets,
>  						  int num_lanes)
>  {
> 
> -- 
> 2.34.1
> 

-- 
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