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SubjectRe: [PATCH v3 3/3] PCI: qcom: Add QCS404 PCIe controller support
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Hi Bjorn,

On 5/2/19 3:19 AM, Bjorn Andersson wrote:
> The QCS404 platform contains a PCIe controller of version 2.4.0 and a
> Qualcomm PCIe2 PHY. The driver already supports version 2.4.0, for the
> IPQ4019, but this support touches clocks and resets related to the PHY
> as well, and there's no upstream driver for the PHY.
>
> On QCS404 we must initialize the PHY, so a separate PHY driver is
> implemented to take care of this and the controller driver is updated to
> not require the PHY related resources. This is done by relying on the
> fact that operations in both the clock and reset framework are nops when
> passed NULL, so we can isolate this change to only the get_resource
> function.
>
> For QCS404 we also need to enable the AHB (iface) clock, in order to
> access the register space of the controller, but as this is not part of
> the IPQ4019 DT binding this is only added for new users of the 2.4.0
> controller.
>
> Reviewed-by: Niklas Cassel <niklas.cassel@linaro.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v2:
> - None
>
> drivers/pci/controller/dwc/pcie-qcom.c | 64 +++++++++++++++-----------
> 1 file changed, 38 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index d740cbe0e56d..d101bc5c0def 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -112,7 +112,7 @@ struct qcom_pcie_resources_2_3_2 {
> struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
> };
>
> -#define QCOM_PCIE_2_4_0_MAX_CLOCKS 3
> +#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4
> struct qcom_pcie_resources_2_4_0 {
> struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
> int num_clks;
> @@ -638,13 +638,16 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
> struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
> struct dw_pcie *pci = pcie->pci;
> struct device *dev = pci->dev;
> + bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019");
> int ret;
>
> res->clks[0].id = "aux";
> res->clks[1].id = "master_bus";
> res->clks[2].id = "slave_bus";
> + res->clks[3].id = "iface";
>
> - res->num_clks = 3;
> + /* qcom,pcie-ipq4019 is defined without "iface" */
> + res->num_clks = is_ipq ? 3 : 4;

This is ugly but I don't have better idea except having static const
resource structures where we can describe num_clks and select the right
resource from compatible string, but lets leave that for the future.

Otherwise:

Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>

--
regards,
Stan

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