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SubjectRe: [PATCH v3 1/2] dt-bindings: PCI: intel: Add YAML schemas for the PCIe RC controller
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On 9/6/2019 4:31 AM, Martin Blumenstingl wrote:
> Hi Dilip,
>
> On Wed, Sep 4, 2019 at 12:11 PM Dilip Kota <eswara.kota@linux.intel.com> wrote:
> [...]
>> +properties:
>> + compatible:
>> + const: intel,lgm-pcie
> should we add the "snps,dw-pcie" here (and in the example below) as well?
> (this is what for example
> Documentation/devicetree/bindings/pci/amlogic,meson-pcie.txt does)
Thanks for pointing out this. We should add this.
>
> [...]
>> + phy-names:
>> + const: pciephy
> the most popular choice in Documentation/devicetree/bindings/pci/ is "pcie-phy"
> if Rob is happy with "pciephy" (which is already part of two other
> bindings) then I'm happy with "pciephy" as well
Agree.
>
>> + num-lanes:
>> + description: Number of lanes to use for this port.
> are there SoCs with more than 2 lanes?
> you can list the allowed values in an enum so "num-lanes = <16>"
> causes an error when someone accidentally has this in their .dts (and
> runs the dt-bindings validation)
Our SoC(LGM) supports single lane or dual lane. Again this also depends
on the board. I wonder if we should put this into board specific dts. 
To make multiple lanes work properly, it also depends on the phy mode.
In my internal version, I put it into board dts.
>
> [...]
>> + reset-assert-ms:
> maybe add:
> $ref: /schemas/types.yaml#/definitions/uint32
Agree
>> + description: |
>> + Device reset interval in ms.
>> + Some devices need an interval upto 500ms. By default it is 100ms.
>> +
>> +required:
>> + - compatible
>> + - device_type
>> + - reg
>> + - reg-names
>> + - ranges
>> + - resets
>> + - clocks
>> + - phys
>> + - phy-names
>> + - reset-gpios
>> + - num-lanes
>> + - linux,pci-domain
>> + - interrupts
>> + - interrupt-map
>> + - interrupt-map-mask
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + pcie10:pcie@d0e00000 {
>> + compatible = "intel,lgm-pcie";
>> + device_type = "pci";
>> + #address-cells = <3>;
>> + #size-cells = <2>;
>> + reg = <
>> + 0xd0e00000 0x1000
>> + 0xd2000000 0x800000
>> + 0xd0a41000 0x1000
>> + >;
>> + reg-names = "dbi", "config", "app";
>> + linux,pci-domain = <0>;
>> + max-link-speed = <4>;
>> + bus-range = <0x00 0x08>;
>> + interrupt-parent = <&ioapic1>;
>> + interrupts = <67 1>;
>> + #interrupt-cells = <1>;
>> + interrupt-map-mask = <0 0 0 0x7>;
>> + interrupt-map = <0 0 0 1 &ioapic1 27 1>,
>> + <0 0 0 2 &ioapic1 28 1>,
>> + <0 0 0 3 &ioapic1 29 1>,
>> + <0 0 0 4 &ioapic1 30 1>;
> is the "1" in the interrupts and interrupt-map properties IRQ_TYPE_EDGE_RISING?
> you can use these macros in this example as well, see
> Documentation/devicetree/bindings/iio/accel/adi,adxl372.yaml for
> example

No. 1 here means index from arch/x86/devicetree.c

static struct of_ioapic_type of_ioapic_type[] =
{
    {
        .out_type    = IRQ_TYPE_EDGE_RISING,
        .trigger    = IOAPIC_EDGE,
        .polarity    = 1,
    },
    {
        .out_type    = IRQ_TYPE_LEVEL_LOW,
        .trigger    = IOAPIC_LEVEL,
        .polarity    = 0,
    },
    {
        .out_type    = IRQ_TYPE_LEVEL_HIGH,
        .trigger    = IOAPIC_LEVEL,
        .polarity    = 1,
    },
    {
        .out_type    = IRQ_TYPE_EDGE_FALLING,
        .trigger    = IOAPIC_EDGE,
        .polarity    = 0,
    },
};

static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
                  unsigned int nr_irqs, void *arg)
{
    struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
    struct of_ioapic_type *it;
    struct irq_alloc_info tmp;
    int type_index;

    if (WARN_ON(fwspec->param_count < 2))
        return -EINVAL;

    type_index = fwspec->param[1]; // index.
    if (type_index >= ARRAY_SIZE(of_ioapic_type))
        return -EINVAL;

I would not see this definition is user-friendly. But it is how x86
handles at the moment.

>
> Martin

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