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Message-Id: <c15993e6c75735161be9ba97a6857ab29926320a.1626768323.git.mchehab+huawei@kernel.org>
Date: Tue, 20 Jul 2021 10:09:11 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Bjorn Helgaas <helgaas@...nel.org>, Rob Herring <robh@...nel.org>
Cc: linuxarm@...wei.com, mauro.chehab@...wei.com,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Kishon Vijay Abraham I <kishon@...com>,
Manivannan Sadhasivam <mani@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Vinod Koul <vkoul@...nel.org>, Wei Xu <xuwei5@...ilicon.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: [PATCH v6 9/9] phy-hi3670-pcie: move reset-gpios to the PCIe DT schema
The PHY interface as found on HiKey 970 uses 4 reset-gpios
instead of just one. That seems to be due to electrical
requirements, as, on HiKey 970, the PERST# signal is
provided via one GPIO per connected/available PCIe device:
- GPIO 56 has a pullup logic from 1V8 to 2V5
connected to a PCIe bridge chip (PEX 8606);
- GPIO 25 has a pullup logic from 1V8 to 3V3
connected to the PERST# pin at the M.2 slot;
- GPIO 220 has a pullup logic from 1V8 to 3V3
connected to the PERST# pin at the PCIe mini slot;
- GPIO 203 has a pullup logic from 1V8 to 3V3
connected to the PERST# pin at the Ethernet chipset.
Originally, this was mapped via the PHY interface, but, as such
design may also be used with different hardware, remap this
to use the pcie-bus DT schema.
This patch depends on a DT schema patch submitted at:
https://github.com/devicetree-org/dt-schema/pull/56
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
.../phy/hisilicon,phy-hi3670-pcie.yaml | 4 --
arch/arm64/boot/dts/hisilicon/hi3670.dtsi | 5 +-
drivers/phy/hisilicon/phy-hi3670-pcie.c | 54 ++++++++++---------
3 files changed, 31 insertions(+), 32 deletions(-)
diff --git a/Documentation/devicetree/bindings/phy/hisilicon,phy-hi3670-pcie.yaml b/Documentation/devicetree/bindings/phy/hisilicon,phy-hi3670-pcie.yaml
index f88b6b7496bb..112a982ee258 100644
--- a/Documentation/devicetree/bindings/phy/hisilicon,phy-hi3670-pcie.yaml
+++ b/Documentation/devicetree/bindings/phy/hisilicon,phy-hi3670-pcie.yaml
@@ -42,10 +42,6 @@ properties:
- const: apb_sys
- const: aclk
- reset-gpios:
- description: PCI PERST reset GPIOs
- maxItems: 4
-
clkreq-gpios:
description: Clock request GPIOs
maxItems: 3
diff --git a/arch/arm64/boot/dts/hisilicon/hi3670.dtsi b/arch/arm64/boot/dts/hisilicon/hi3670.dtsi
index 6dfcfcfeedae..a07790c76b72 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3670.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hi3670.dtsi
@@ -687,9 +687,6 @@ pcie_phy: pcie-phy@...00000 {
"apb_phy", "apb_sys",
"aclk";
- reset-gpios = <&gpio7 0 0 >, <&gpio25 2 0 >,
- <&gpio3 1 0 >, <&gpio27 4 0 >;
-
clkreq-gpios = <&gpio20 6 0 >, <&gpio27 3 0 >,
<&gpio17 0 0 >;
@@ -729,6 +726,8 @@ &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>;
+ reset-gpios = <&gpio7 0 0 >, <&gpio25 2 0 >,
+ <&gpio3 1 0 >, <&gpio27 4 0 >;
};
/* UFS */
diff --git a/drivers/phy/hisilicon/phy-hi3670-pcie.c b/drivers/phy/hisilicon/phy-hi3670-pcie.c
index e80143df0217..77bf5bb07ba2 100644
--- a/drivers/phy/hisilicon/phy-hi3670-pcie.c
+++ b/drivers/phy/hisilicon/phy-hi3670-pcie.c
@@ -553,11 +553,13 @@ static int hi3670_pcie_noc_power(struct hi3670_pcie_phy *phy, bool enable)
return 0;
}
-static int hi3670_pcie_get_apb(struct hi3670_pcie_phy *phy)
+static int hi3670_pcie_get_resources_from_pcie(struct hi3670_pcie_phy *phy)
{
struct device_node *pcie_port;
struct device *dev = phy->dev;
struct device *pcie_dev;
+ char name[32];
+ int i;
pcie_port = of_get_child_by_name(dev->parent->of_node, "pcie");
if (!pcie_port) {
@@ -586,6 +588,27 @@ static int hi3670_pcie_get_apb(struct hi3670_pcie_phy *phy)
return -ENODEV;
}
+ /* perst reset gpios */
+ phy->n_gpio_resets = of_gpio_named_count(pcie_dev->of_node,
+ "reset-gpios");
+ if (phy->n_gpio_resets > MAX_GPIO_RESETS) {
+ dev_err(dev, "Too many GPIO resets!\n");
+ return -EINVAL;
+ }
+ for (i = 0; i < phy->n_gpio_resets; i++) {
+ phy->gpio_id_reset[i] = of_get_named_gpio(pcie_dev->of_node,
+ "reset-gpios", i);
+ if (phy->gpio_id_reset[i] < 0)
+ return phy->gpio_id_reset[i];
+
+ sprintf(name, "pcie_perst_%d", i);
+
+ phy->reset_names[i] = devm_kstrdup_const(dev, name,
+ GFP_KERNEL);
+ if (!phy->reset_names[i])
+ return -ENOMEM;
+ }
+
return 0;
}
@@ -644,16 +667,17 @@ static int hi3670_pcie_phy_init(struct phy *generic_phy)
int ret;
/*
- * The code under hi3670_pcie_get_apb() need to access the
- * DWC APB registers. So, get them from
- * the pcie driver's regmap (see pcie-kirin regmap).
+ * The code under hi3670_pcie_get_resources_from_pcie() need to
+ * access the reset-gpios and the APB registers, both from the
+ * pcie-kirin driver.
*
+ * The APB is obtained via the pcie driver's regmap
* Such kind of resource can only be obtained during the PCIe
* power_on sequence, as the code inside pcie-kirin needs to
* be already probed, as it needs to register the APB regmap.
*/
- ret = hi3670_pcie_get_apb(phy);
+ ret = hi3670_pcie_get_resources_from_pcie(phy);
if (ret)
return ret;
@@ -800,26 +824,6 @@ static int hi3670_pcie_phy_get_resources(struct hi3670_pcie_phy *phy,
if (IS_ERR(phy->base))
return PTR_ERR(phy->base);
- /* perst reset gpios */
- phy->n_gpio_resets = of_gpio_named_count(np, "reset-gpios");
- if (phy->n_gpio_resets > MAX_GPIO_RESETS) {
- dev_err(dev, "Too many GPIO resets!\n");
- return -EINVAL;
- }
- for (i = 0; i < phy->n_gpio_resets; i++) {
- phy->gpio_id_reset[i] = of_get_named_gpio(dev->of_node,
- "reset-gpios", i);
- if (phy->gpio_id_reset[i] < 0)
- return phy->gpio_id_reset[i];
-
- sprintf(name, "pcie_perst_%d", i);
-
- phy->reset_names[i] = devm_kstrdup_const(dev, name,
- GFP_KERNEL);
- if (!phy->reset_names[i])
- return -ENOMEM;
- }
-
/* clock request gpios */
phy->n_gpio_clkreq = of_gpio_named_count(np, "clkreq-gpios");
if (phy->n_gpio_clkreq > MAX_GPIO_CLKREQ) {
--
2.31.1
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