Re: [PATCH v2 4/4] PCI: kirin: Convert to agnostic GPIO API

Manivannan Sadhasivam
2024-04-27T07:24:06Z

On Tue, Apr 23, 2024 at 08:19:07PM +0300, Andy Shevchenko wrote:
> The of_gpio.h is going to be removed. In preparation of that convert
> the driver to the agnostic API.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
> drivers/pci/controller/dwc/pcie-kirin.c | 105 ++++++++----------------
> 1 file changed, 35 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index d5523f302102..1753ab63a541 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -12,12 +12,10 @@
> #include <linux/compiler.h>
> #include <linux/delay.h>
> #include <linux/err.h>
> -#include <linux/gpio.h>
> #include <linux/gpio/consumer.h>
> #include <linux/interrupt.h>
> #include <linux/mfd/syscon.h>
> #include <linux/of.h>
> -#include <linux/of_gpio.h>
> #include <linux/of_pci.h>
> #include <linux/phy/phy.h>
> #include <linux/pci.h>
> @@ -78,16 +76,16 @@ struct kirin_pcie {
> void *phy_priv; /* only for PCIE_KIRIN_INTERNAL_PHY */
>
> /* DWC PERST# */
> - int gpio_id_dwc_perst;
> + struct gpio_desc *id_dwc_perst_gpio;
>
> /* Per-slot PERST# */
> int num_slots;
> - int gpio_id_reset[MAX_PCI_SLOTS];
> + struct gpio_desc *id_reset_gpio[MAX_PCI_SLOTS];
> const char *reset_names[MAX_PCI_SLOTS];
>
> /* Per-slot clkreq */
> int n_gpio_clkreq;
> - int gpio_id_clkreq[MAX_PCI_SLOTS];
> + struct gpio_desc *id_clkreq_gpio[MAX_PCI_SLOTS];
> const char *clkreq_names[MAX_PCI_SLOTS];
> };
>
> @@ -381,15 +379,20 @@ static int kirin_pcie_get_gpio_enable(struct kirin_pcie *pcie,
> pcie->n_gpio_clkreq = ret;
>
> for (i = 0; i < pcie->n_gpio_clkreq; i++) {
> - pcie->gpio_id_clkreq[i] = of_get_named_gpio(dev->of_node,
> - "hisilicon,clken-gpios", i);
> - if (pcie->gpio_id_clkreq[i] < 0)
> - return pcie->gpio_id_clkreq[i];
> + pcie->id_clkreq_gpio[i] = devm_gpiod_get_index(dev,
> + "hisilicon,clken", i,
> + GPIOD_ASIS);

Please don't use GPIOD_ASIS even if the old code was using it.

For all 3 GPIOs in this driver, GPIOD_OUT_LOW flag should be used as the default
state is assert (considering the fact that the DT uses GPIO_ACTIVE_HIGH).

- Mani

> + if (IS_ERR(pcie->id_clkreq_gpio[i]))
> + return dev_err_probe(dev, PTR_ERR(pcie->id_clkreq_gpio[i]),
> + "unable to get a valid clken gpio\n");
>
> pcie->clkreq_names[i] = devm_kasprintf(dev, GFP_KERNEL,
> "pcie_clkreq_%d", i);
> if (!pcie->clkreq_names[i])
> return -ENOMEM;
> +
> + gpiod_set_consumer_name(pcie->id_clkreq_gpio[i],
> + pcie->clkreq_names[i]);
> }
>
> return 0;
> @@ -407,10 +410,16 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
> for_each_available_child_of_node(parent, child) {
> i = pcie->num_slots;
>
> - pcie->gpio_id_reset[i] = of_get_named_gpio(child,
> - "reset-gpios", 0);
> - if (pcie->gpio_id_reset[i] < 0)
> - continue;
> + pcie->id_reset_gpio[i] = devm_fwnode_gpiod_get_index(dev,
> + of_fwnode_handle(child),
> + "reset", 0, GPIOD_ASIS,
> + NULL);
> + if (IS_ERR(pcie->id_reset_gpio[i])) {
> + if (PTR_ERR(pcie->id_reset_gpio[i]) == -ENOENT)
> + continue;
> + return dev_err_probe(dev, PTR_ERR(pcie->id_reset_gpio[i]),
> + "unable to get a valid reset gpio\n");
> + }
>
> pcie->num_slots++;
> if (pcie->num_slots > MAX_PCI_SLOTS) {
> @@ -434,6 +443,9 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
> ret = -ENOMEM;
> goto put_node;
> }
> +
> + gpiod_set_consumer_name(pcie->id_reset_gpio[i],
> + pcie->reset_names[i]);
> }
> }
>
> @@ -463,14 +475,11 @@ static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
> return PTR_ERR(kirin_pcie->apb);
>
> /* pcie internal PERST# gpio */
> - kirin_pcie->gpio_id_dwc_perst = of_get_named_gpio(dev->of_node,
> - "reset-gpios", 0);
> - if (kirin_pcie->gpio_id_dwc_perst == -EPROBE_DEFER) {
> - return -EPROBE_DEFER;
> - } else if (!gpio_is_valid(kirin_pcie->gpio_id_dwc_perst)) {
> - dev_err(dev, "unable to get a valid gpio pin\n");
> - return -ENODEV;
> - }
> + kirin_pcie->id_dwc_perst_gpio = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
> + if (IS_ERR(kirin_pcie->id_dwc_perst_gpio))
> + return dev_err_probe(dev, PTR_ERR(kirin_pcie->id_dwc_perst_gpio),
> + "unable to get a valid gpio pin\n");
> + gpiod_set_consumer_name(kirin_pcie->id_dwc_perst_gpio, "pcie_perst_bridge");
>
> ret = kirin_pcie_get_gpio_enable(kirin_pcie, pdev);
> if (ret)
> @@ -553,7 +562,7 @@ static int kirin_pcie_add_bus(struct pci_bus *bus)
>
> /* Send PERST# to each slot */
> for (i = 0; i < kirin_pcie->num_slots; i++) {
> - ret = gpio_direction_output(kirin_pcie->gpio_id_reset[i], 1);
> + ret = gpiod_direction_output_raw(kirin_pcie->id_reset_gpio[i], 1);
> if (ret) {
> dev_err(pci->dev, "PERST# %s error: %d\n",
> kirin_pcie->reset_names[i], ret);
> @@ -623,44 +632,6 @@ static int kirin_pcie_host_init(struct dw_pcie_rp *pp)
> return 0;
> }
>
> -static int kirin_pcie_gpio_request(struct kirin_pcie *kirin_pcie,
> - struct device *dev)
> -{
> - int ret, i;
> -
> - for (i = 0; i < kirin_pcie->num_slots; i++) {
> - if (!gpio_is_valid(kirin_pcie->gpio_id_reset[i])) {
> - dev_err(dev, "unable to get a valid %s gpio\n",
> - kirin_pcie->reset_names[i]);
> - return -ENODEV;
> - }
> -
> - ret = devm_gpio_request(dev, kirin_pcie->gpio_id_reset[i],
> - kirin_pcie->reset_names[i]);
> - if (ret)
> - return ret;
> - }
> -
> - for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) {
> - if (!gpio_is_valid(kirin_pcie->gpio_id_clkreq[i])) {
> - dev_err(dev, "unable to get a valid %s gpio\n",
> - kirin_pcie->clkreq_names[i]);
> - return -ENODEV;
> - }
> -
> - ret = devm_gpio_request(dev, kirin_pcie->gpio_id_clkreq[i],
> - kirin_pcie->clkreq_names[i]);
> - if (ret)
> - return ret;
> -
> - ret = gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 0);
> - if (ret)
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> static const struct dw_pcie_ops kirin_dw_pcie_ops = {
> .read_dbi = kirin_pcie_read_dbi,
> .write_dbi = kirin_pcie_write_dbi,
> @@ -680,7 +651,7 @@ static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie)
> return hi3660_pcie_phy_power_off(kirin_pcie);
>
> for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++)
> - gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 1);
> + gpiod_direction_output_raw(kirin_pcie->id_clkreq_gpio[i], 1);
>
> phy_power_off(kirin_pcie->phy);
> phy_exit(kirin_pcie->phy);
> @@ -707,10 +678,6 @@ static int kirin_pcie_power_on(struct platform_device *pdev,
> if (IS_ERR(kirin_pcie->phy))
> return PTR_ERR(kirin_pcie->phy);
>
> - ret = kirin_pcie_gpio_request(kirin_pcie, dev);
> - if (ret)
> - return ret;
> -
> ret = phy_init(kirin_pcie->phy);
> if (ret)
> goto err;
> @@ -723,11 +690,9 @@ static int kirin_pcie_power_on(struct platform_device *pdev,
> /* perst assert Endpoint */
> usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX);
>
> - if (!gpio_request(kirin_pcie->gpio_id_dwc_perst, "pcie_perst_bridge")) {
> - ret = gpio_direction_output(kirin_pcie->gpio_id_dwc_perst, 1);
> - if (ret)
> - goto err;
> - }
> + ret = gpiod_direction_output_raw(kirin_pcie->id_dwc_perst_gpio, 1);
> + if (ret)
> + goto err;
>
> usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
>
> --
> 2.43.0.rc1.1336.g36b5255a03ac
>

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