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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2019-02-11 17:51:08 -0800 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2019-03-01 10:55:06 +0000 |
| commit | 5278f65107b15c999cb8a16ee0142015cff6a690 (patch) | |
| tree | 062b34d16eb7f0d28df42490cca2d66d358dcff8 /drivers/pci/controller | |
| parent | d82ca49f3e8aa300819cd6c917cfd65ab998fccf (diff) | |
| download | linux-5278f65107b15c999cb8a16ee0142015cff6a690.tar.gz linux-5278f65107b15c999cb8a16ee0142015cff6a690.tar.bz2 linux-5278f65107b15c999cb8a16ee0142015cff6a690.zip | |
PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ
The PCIe IP block has an additional clock, "pcie_aux", that needs to
be controlled by the driver. Add code to support it.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
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
Diffstat (limited to 'drivers/pci/controller')
| -rw-r--r-- | drivers/pci/controller/dwc/pci-imx6.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 64c74334f7d0..f5a16fd15be5 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -66,6 +66,7 @@ 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; @@ -459,6 +460,12 @@ 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 @@ -976,6 +983,9 @@ 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; } @@ -1121,8 +1131,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie_inbound_axi); } break; - case IMX7D: case IMX8MQ: + 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); + } + /* fall through */ + case IMX7D: if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR) imx6_pcie->controller_id = 1; |