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SubjectRe: [PATCH 06/10] PCI: qcom: Add support for SC8280XP
On Wed, Jun 29, 2022 at 04:09:56PM +0200, Johan Hovold wrote:
> The SC8280XP platform has seven PCIe controllers: two used with USB4,
> two 4-lane, two 2-lane and one 1-lane.
>
> Add a new "qcom,pcie-sc8280xp" compatible string and reuse the 1.9.0
> ops.
>
> Note that the SC8280XP controllers need two or three interconnect
> clocks to be enabled. Model these as optional clocks to avoid encoding
> devicetree data in the PCIe driver.

Shouldn't the interconnect binding handle these? Probably, bus clocks
have to be the biggest single reason why clocks are such a mess in terms
of 'the same' block having different clocks.

>
> Note that the same could be done for the SM8450 interconnect clocks and
> possibly also for the TBU clocks.
>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
> drivers/pci/controller/dwc/pcie-qcom.c | 22 ++++++++++++++++++++--
> 1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index ff1b40f213c1..da3f1cdc4ba6 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -160,7 +160,7 @@ struct qcom_pcie_resources_2_3_3 {
>
> /* 6 clocks typically, 7 for sm8250 */
> struct qcom_pcie_resources_2_7_0 {
> - struct clk_bulk_data clks[9];
> + struct clk_bulk_data clks[12];
> int num_clks;
> struct regulator_bulk_data supplies[2];
> struct reset_control *pci_reset;
> @@ -1119,6 +1119,7 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
> struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
> struct dw_pcie *pci = pcie->pci;
> struct device *dev = pci->dev;
> + unsigned int num_clks, num_opt_clks;
> unsigned int idx;
> int ret;
>
> @@ -1148,9 +1149,20 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
> if (pcie->cfg->has_aggre1_clk)
> res->clks[idx++].id = "aggre1";
>
> + num_clks = idx;
> +
> + ret = devm_clk_bulk_get(dev, num_clks, res->clks);
> + if (ret < 0)
> + return ret;
> +
> + res->clks[idx++].id = "noc_aggr_4";
> + res->clks[idx++].id = "noc_aggr_south_sf";
> + res->clks[idx++].id = "cnoc_qx";
> +
> + num_opt_clks = idx - num_clks;
> res->num_clks = idx;
>
> - ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
> + ret = devm_clk_bulk_get_optional(dev, num_opt_clks, res->clks + num_clks);
> if (ret < 0)
> return ret;
>
> @@ -1449,6 +1461,11 @@ static const struct qcom_pcie_cfg ipq4019_cfg = {
> .ops = &ops_2_4_0,
> };
>
> +static const struct qcom_pcie_cfg sc8280xp_cfg = {
> + .ops = &ops_1_9_0,
> + .has_ddrss_sf_tbu_clk = true,
> +};
> +
> static const struct qcom_pcie_cfg sdm845_cfg = {
> .ops = &ops_2_7_0,
> .has_tbu_clk = true,
> @@ -1613,6 +1630,7 @@ static const struct of_device_id qcom_pcie_match[] = {
> { .compatible = "qcom,pcie-sm8150", .data = &sm8150_cfg },
> { .compatible = "qcom,pcie-sm8250", .data = &sm8250_cfg },
> { .compatible = "qcom,pcie-sc8180x", .data = &sc8180x_cfg },
> + { .compatible = "qcom,pcie-sc8280xp", .data = &sc8280xp_cfg },
> { .compatible = "qcom,pcie-sm8450-pcie0", .data = &sm8450_pcie0_cfg },
> { .compatible = "qcom,pcie-sm8450-pcie1", .data = &sm8450_pcie1_cfg },
> { .compatible = "qcom,pcie-sc7280", .data = &sc7280_cfg },
> --
> 2.35.1
>
>

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