[PATCH 2/2] PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ

Andrey Smirnov
2019-02-12T01:51:31Z

PCIe IP block has additional clock, "pcie_aux", that needs to be
controlled by the driver. Add code to support that.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
---
drivers/pci/controller/dwc/pci-imx6.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 7cdf8f9ab244..1a7031782846 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -65,6 +65,7 @@ struct imx6_pcie {
struct clk *pcie_phy;
struct clk *pcie_inbound_axi;
struct clk *pcie;
+ struct clk *pcie_aux;
struct regmap *iomuxc_gpr;
u32 controller_id;
struct reset_control *pciephy_reset;
@@ -421,6 +422,12 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
case IMX7D:
break;
case IMX8MQ:
+ ret = clk_prepare_enable(imx6_pcie->pcie_aux);
+ if (ret) {
+ dev_err(dev, "unable to enable pcie_aux clock\n");
+ break;
+ }
+
offset = imx6_pcie_grp_offset(imx6_pcie);
/*
* Set the over ride low and enabled
@@ -904,6 +911,9 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
break;
+ case IMX8MQ:
+ clk_disable_unprepare(imx6_pcie->pcie_aux);
+ break;
default:
break;
}
@@ -1049,6 +1059,12 @@ static int imx6_pcie_probe(struct platform_device *pdev)
dev_err(dev, "Failed to get PCIE APPS reset control\n");
return PTR_ERR(imx6_pcie->apps_reset);
}
+
+ imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
+ if (IS_ERR(imx6_pcie->pcie_aux)) {
+ dev_err(dev, "pcie_aux clock source missing or invalid\n");
+ return PTR_ERR(imx6_pcie->pcie_aux);
+ }
break;
default:
break;
--
2.20.1