* [PATCH v5 0/8] Add support for Hikey 970 PCIe
@ 2021-07-13 6:28 Mauro Carvalho Chehab
2021-07-13 6:28 ` [PATCH v5 7/8] PCI: kirin: Drop the PHY logic from the driver Mauro Carvalho Chehab
0 siblings, 1 reply; 2+ messages in thread
From: Mauro Carvalho Chehab @ 2021-07-13 6:28 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: linuxarm, mauro.chehab, Mauro Carvalho Chehab,
Manivannan Sadhasivam, Rob Herring, Krzysztof Wilczyński,
Binghui Wang, Rob Herring, Xiaowei Song, devicetree,
linux-arm-kernel, linux-kernel, linux-pci, linux-phy
As requested by Rob Herring, this series split the PHY part into a separate driver.
Then, it adds support for Kirin 970 on a single patch.
With this change, the PHY-specific device tree bindings for Kirin 960 moved
to its own PHY properties.
Tested on Hikey970:
$ lspci
00:00.0 PCI bridge: Huawei Technologies Co., Ltd. Device 3670 (rev 01)
01:00.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
02:01.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
02:04.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
02:05.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
02:07.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
02:09.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express Gen 2 (5.0 GT/s) Switch (rev ba)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)
$ ethtool enp6s0
Settings for enp6s0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: preferred slave
master-slave status: slave
Port: Twisted Pair
PHYAD: 0
Transceiver: external
MDI-X: Unknown
netlink error: Operation not permitted
Link detected: yes
Partially tested on Hikey 960[1]:
$ lspci
00:00.0 PCI bridge: Huawei Technologies Co., Ltd. Device 3660 (rev 01)
[1] The Hikey 960 doesn't come with any internal PCIe device.
Its hardware supports just an external device via a M.2 slot that
doesn't support SATA. I ordered a NVMe device to test, but the vendor
is currently out of supply. It should take 3-4 weeks to arrive here. I'll
run an extra test on it once it arrives.
---
v5:
- added "static" to hi3670_pcie_get_eyeparam() declaration on patch 6/8
v4:
- dropped the DTS patch, as it depends on a PMIC-related patch series;
- minor changes at the patch description;
- HiKey and HiSilicon are now using the preferred CamelCase format.
Mauro Carvalho Chehab (8):
dt-bindings: phy: Add bindings for HiKey 960 PCIe PHY
dt-bindings: phy: Add bindings for HiKey 970 PCIe PHY
dt-bindings: PCI: kirin: Fix compatible string
dt-bindings: PCI: kirin: Drop PHY properties
phy: HiSilicon: Add driver for Kirin 960 PCIe PHY
phy: HiSilicon: add driver for Kirin 970 PCIe PHY
PCI: kirin: Drop the PHY logic from the driver
PCI: kirin: Use regmap for APB registers
.../devicetree/bindings/pci/kirin-pcie.txt | 21 +-
.../phy/hisilicon,phy-hi3660-pcie.yaml | 82 ++
.../phy/hisilicon,phy-hi3670-pcie.yaml | 101 ++
arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 29 +-
drivers/pci/controller/dwc/pcie-kirin.c | 298 ++----
drivers/phy/hisilicon/Kconfig | 20 +
drivers/phy/hisilicon/Makefile | 2 +
drivers/phy/hisilicon/phy-hi3660-pcie.c | 325 +++++++
drivers/phy/hisilicon/phy-hi3670-pcie.c | 892 ++++++++++++++++++
9 files changed, 1500 insertions(+), 270 deletions(-)
create mode 100644 Documentation/devicetree/bindings/phy/hisilicon,phy-hi3660-pcie.yaml
create mode 100644 Documentation/devicetree/bindings/phy/hisilicon,phy-hi3670-pcie.yaml
create mode 100644 drivers/phy/hisilicon/phy-hi3660-pcie.c
create mode 100644 drivers/phy/hisilicon/phy-hi3670-pcie.c
--
2.31.1
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^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH v5 7/8] PCI: kirin: Drop the PHY logic from the driver
2021-07-13 6:28 [PATCH v5 0/8] Add support for Hikey 970 PCIe Mauro Carvalho Chehab
@ 2021-07-13 6:28 ` Mauro Carvalho Chehab
0 siblings, 0 replies; 2+ messages in thread
From: Mauro Carvalho Chehab @ 2021-07-13 6:28 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: linuxarm, mauro.chehab, Mauro Carvalho Chehab,
Krzysztof Wilczyński, Manivannan Sadhasivam, Rob Herring,
Binghui Wang, Bjorn Helgaas, Lorenzo Pieralisi, Rob Herring,
Wei Xu, Xiaowei Song, devicetree, linux-arm-kernel, linux-kernel,
linux-pci
The pcie-kirin PCIe driver contains internally a PHY interface for
a Kirin 960. Drop it and add support for using the new PHY driver
for Kirin 960, updating DT accordingly.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 29 ++-
drivers/pci/controller/dwc/pcie-kirin.c | 252 +++-------------------
2 files changed, 47 insertions(+), 234 deletions(-)
diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
index f1ec87c05842..772bb632814f 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
@@ -995,17 +995,33 @@ spi3: spi@ff3b3000 {
status = "disabled";
};
+ pcie_phy: pcie-phy@f3f2000 {
+ compatible = "hisilicon,hi960-pcie-phy";
+ reg = <0x0 0xf3f20000 0x0 0x40000>;
+ reg-names = "phy";
+ clocks = <&crg_ctrl HI3660_PCIEPHY_REF>,
+ <&crg_ctrl HI3660_CLK_GATE_PCIEAUX>,
+ <&crg_ctrl HI3660_PCLK_GATE_PCIE_PHY>,
+ <&crg_ctrl HI3660_PCLK_GATE_PCIE_SYS>,
+ <&crg_ctrl HI3660_ACLK_GATE_PCIE>;
+ clock-names = "pcie_phy_ref", "pcie_aux",
+ "pcie_apb_phy", "pcie_apb_sys",
+ "pcie_aclk";
+ reset-gpios = <&gpio11 1 0 >;
+ #phy-cells = <0>;
+ };
+
pcie@f4000000 {
compatible = "hisilicon,kirin960-pcie";
reg = <0x0 0xf4000000 0x0 0x1000>,
<0x0 0xff3fe000 0x0 0x1000>,
- <0x0 0xf3f20000 0x0 0x40000>,
<0x0 0xf5000000 0x0 0x2000>;
- reg-names = "dbi", "apb", "phy", "config";
+ reg-names = "dbi", "apb", "config";
bus-range = <0x0 0x1>;
#address-cells = <3>;
#size-cells = <2>;
device_type = "pci";
+ phys = <&pcie_phy>;
ranges = <0x02000000 0x0 0x00000000
0x0 0xf6000000
0x0 0x02000000>;
@@ -1022,15 +1038,6 @@ &gic GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>,
&gic GIC_SPI 284 IRQ_TYPE_LEVEL_HIGH>,
<0x0 0 0 4
&gic GIC_SPI 285 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&crg_ctrl HI3660_PCIEPHY_REF>,
- <&crg_ctrl HI3660_CLK_GATE_PCIEAUX>,
- <&crg_ctrl HI3660_PCLK_GATE_PCIE_PHY>,
- <&crg_ctrl HI3660_PCLK_GATE_PCIE_SYS>,
- <&crg_ctrl HI3660_ACLK_GATE_PCIE>;
- clock-names = "pcie_phy_ref", "pcie_aux",
- "pcie_apb_phy", "pcie_apb_sys",
- "pcie_aclk";
- reset-gpios = <&gpio11 1 0 >;
};
/* UFS */
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 7b0f87535960..66662f7b0fc9 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -9,7 +9,6 @@
*/
#include <linux/compiler.h>
-#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
@@ -21,6 +20,7 @@
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/resource.h>
#include <linux/types.h>
@@ -28,26 +28,17 @@
#define to_kirin_pcie(x) dev_get_drvdata((x)->dev)
-#define REF_CLK_FREQ 100000000
-
/* PCIe ELBI registers */
#define SOC_PCIECTRL_CTRL0_ADDR 0x000
#define SOC_PCIECTRL_CTRL1_ADDR 0x004
-#define SOC_PCIEPHY_CTRL2_ADDR 0x008
-#define SOC_PCIEPHY_CTRL3_ADDR 0x00c
#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21)
/* info located in APB */
#define PCIE_APP_LTSSM_ENABLE 0x01c
-#define PCIE_APB_PHY_CTRL0 0x0
-#define PCIE_APB_PHY_CTRL1 0x4
#define PCIE_APB_PHY_STATUS0 0x400
#define PCIE_LINKUP_ENABLE (0x8020)
#define PCIE_LTSSM_ENABLE_BIT (0x1 << 11)
#define PIPE_CLK_STABLE (0x1 << 19)
-#define PHY_REF_PAD_BIT (0x1 << 8)
-#define PHY_PWR_DOWN_BIT (0x1 << 22)
-#define PHY_RST_ACK_BIT (0x1 << 16)
/* info located in sysctrl */
#define SCTRL_PCIE_CMOS_OFFSET 0x60
@@ -60,36 +51,10 @@
#define PCIE_DEBOUNCE_PARAM 0xF0F400
#define PCIE_OE_BYPASS (0x3 << 28)
-/* peri_crg ctrl */
-#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
-#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
-
-/* Time for delay */
-#define REF_2_PERST_MIN 20000
-#define REF_2_PERST_MAX 25000
-#define PERST_2_ACCESS_MIN 10000
-#define PERST_2_ACCESS_MAX 12000
-#define LINK_WAIT_MIN 900
-#define LINK_WAIT_MAX 1000
-#define PIPE_CLK_WAIT_MIN 550
-#define PIPE_CLK_WAIT_MAX 600
-#define TIME_CMOS_MIN 100
-#define TIME_CMOS_MAX 105
-#define TIME_PHY_PD_MIN 10
-#define TIME_PHY_PD_MAX 11
-
struct kirin_pcie {
struct dw_pcie *pci;
+ struct phy *phy;
void __iomem *apb_base;
- void __iomem *phy_base;
- struct regmap *crgctrl;
- struct regmap *sysctrl;
- struct clk *apb_sys_clk;
- struct clk *apb_phy_clk;
- struct clk *phy_ref_clk;
- struct clk *pcie_aclk;
- struct clk *pcie_aux_clk;
- int gpio_id_reset;
};
/* Registers in PCIeCTRL */
@@ -104,46 +69,6 @@ static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg)
return readl(kirin_pcie->apb_base + reg);
}
-/* Registers in PCIePHY */
-static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie,
- u32 val, u32 reg)
-{
- writel(val, kirin_pcie->phy_base + reg);
-}
-
-static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg)
-{
- return readl(kirin_pcie->phy_base + reg);
-}
-
-static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie,
- struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
-
- kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref");
- if (IS_ERR(kirin_pcie->phy_ref_clk))
- return PTR_ERR(kirin_pcie->phy_ref_clk);
-
- kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux");
- if (IS_ERR(kirin_pcie->pcie_aux_clk))
- return PTR_ERR(kirin_pcie->pcie_aux_clk);
-
- kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy");
- if (IS_ERR(kirin_pcie->apb_phy_clk))
- return PTR_ERR(kirin_pcie->apb_phy_clk);
-
- kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys");
- if (IS_ERR(kirin_pcie->apb_sys_clk))
- return PTR_ERR(kirin_pcie->apb_sys_clk);
-
- kirin_pcie->pcie_aclk = devm_clk_get(dev, "pcie_aclk");
- if (IS_ERR(kirin_pcie->pcie_aclk))
- return PTR_ERR(kirin_pcie->pcie_aclk);
-
- return 0;
-}
-
static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
struct platform_device *pdev)
{
@@ -152,149 +77,18 @@ static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
if (IS_ERR(kirin_pcie->apb_base))
return PTR_ERR(kirin_pcie->apb_base);
- kirin_pcie->phy_base =
- devm_platform_ioremap_resource_byname(pdev, "phy");
- if (IS_ERR(kirin_pcie->phy_base))
- return PTR_ERR(kirin_pcie->phy_base);
-
- kirin_pcie->crgctrl =
- syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl");
- if (IS_ERR(kirin_pcie->crgctrl))
- return PTR_ERR(kirin_pcie->crgctrl);
-
- kirin_pcie->sysctrl =
- syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl");
- if (IS_ERR(kirin_pcie->sysctrl))
- return PTR_ERR(kirin_pcie->sysctrl);
-
return 0;
}
-static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie)
-{
- struct device *dev = kirin_pcie->pci->dev;
- u32 reg_val;
-
- reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1);
- reg_val &= ~PHY_REF_PAD_BIT;
- kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1);
-
- reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0);
- reg_val &= ~PHY_PWR_DOWN_BIT;
- kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0);
- usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX);
-
- reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1);
- reg_val &= ~PHY_RST_ACK_BIT;
- kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1);
-
- usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX);
- reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0);
- if (reg_val & PIPE_CLK_STABLE) {
- dev_err(dev, "PIPE clk is not stable\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie)
-{
- u32 val;
-
- regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
- val |= PCIE_DEBOUNCE_PARAM;
- val &= ~PCIE_OE_BYPASS;
- regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
-}
-
-static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable)
-{
- int ret = 0;
-
- if (!enable)
- goto close_clk;
-
- ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ);
- if (ret)
- return ret;
-
- ret = clk_prepare_enable(kirin_pcie->phy_ref_clk);
- if (ret)
- return ret;
-
- ret = clk_prepare_enable(kirin_pcie->apb_sys_clk);
- if (ret)
- goto apb_sys_fail;
-
- ret = clk_prepare_enable(kirin_pcie->apb_phy_clk);
- if (ret)
- goto apb_phy_fail;
-
- ret = clk_prepare_enable(kirin_pcie->pcie_aclk);
- if (ret)
- goto aclk_fail;
-
- ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk);
- if (ret)
- goto aux_clk_fail;
-
- return 0;
-
-close_clk:
- clk_disable_unprepare(kirin_pcie->pcie_aux_clk);
-aux_clk_fail:
- clk_disable_unprepare(kirin_pcie->pcie_aclk);
-aclk_fail:
- clk_disable_unprepare(kirin_pcie->apb_phy_clk);
-apb_phy_fail:
- clk_disable_unprepare(kirin_pcie->apb_sys_clk);
-apb_sys_fail:
- clk_disable_unprepare(kirin_pcie->phy_ref_clk);
-
- return ret;
-}
-
static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie)
{
int ret;
- /* Power supply for Host */
- regmap_write(kirin_pcie->sysctrl,
- SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
- usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
- kirin_pcie_oe_enable(kirin_pcie);
-
- ret = kirin_pcie_clk_ctrl(kirin_pcie, true);
+ ret = phy_init(kirin_pcie->phy);
if (ret)
return ret;
- /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
- regmap_write(kirin_pcie->sysctrl,
- SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
- regmap_write(kirin_pcie->crgctrl,
- CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT);
- regmap_write(kirin_pcie->sysctrl,
- SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT);
-
- ret = kirin_pcie_phy_init(kirin_pcie);
- if (ret)
- goto close_clk;
-
- /* perst assert Endpoint */
- if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) {
- usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX);
- ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1);
- if (ret)
- goto close_clk;
- usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
-
- return 0;
- }
-
-close_clk:
- kirin_pcie_clk_ctrl(kirin_pcie, false);
- return ret;
+ return phy_power_on(kirin_pcie->phy);
}
static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie,
@@ -444,30 +238,41 @@ static int kirin_pcie_probe(struct platform_device *pdev)
pci->pp.ops = &kirin_pcie_host_ops;
kirin_pcie->pci = pci;
- ret = kirin_pcie_get_clk(kirin_pcie, pdev);
- if (ret)
- return ret;
+ kirin_pcie->phy = devm_of_phy_get(dev, dev->of_node, NULL);
+ if (IS_ERR(kirin_pcie->phy))
+ return PTR_ERR(kirin_pcie->phy);
ret = kirin_pcie_get_resource(kirin_pcie, pdev);
if (ret)
return ret;
- kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node,
- "reset-gpios", 0);
- if (kirin_pcie->gpio_id_reset == -EPROBE_DEFER) {
- return -EPROBE_DEFER;
- } else if (!gpio_is_valid(kirin_pcie->gpio_id_reset)) {
- dev_err(dev, "unable to get a valid gpio pin\n");
- return -ENODEV;
- }
-
ret = kirin_pcie_power_on(kirin_pcie);
if (ret)
return ret;
platform_set_drvdata(pdev, kirin_pcie);
- return dw_pcie_host_init(&pci->pp);
+ ret = dw_pcie_host_init(&pci->pp);
+ if (ret) {
+ phy_power_off(kirin_pcie->phy);
+ goto err;
+ }
+
+ return 0;
+err:
+ phy_exit(kirin_pcie->phy);
+
+ return ret;
+}
+
+static int __exit kirin_pcie_remove(struct platform_device *pdev)
+{
+ struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
+
+ phy_power_off(kirin_pcie->phy);
+ phy_exit(kirin_pcie->phy);
+
+ return 0;
}
static const struct of_device_id kirin_pcie_match[] = {
@@ -478,6 +283,7 @@ static const struct of_device_id kirin_pcie_match[] = {
static struct platform_driver kirin_pcie_driver = {
.probe = kirin_pcie_probe,
+ .remove = __exit_p(kirin_pcie_remove),
.driver = {
.name = "kirin-pcie",
.of_match_table = kirin_pcie_match,
--
2.31.1
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 2+ messages in thread
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