linux-kernel - Re: [PATCH v11 19/20] PCI: starfive: Add JH7110 PCIe controller

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Date:   Sat, 2 Dec 2023 06:44:03 -0800
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     Minda Chen <minda.chen@...rfivetech.com>,
        Conor Dooley <conor@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-pci@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mason Huo <mason.huo@...rfivetech.com>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        Kevin Xie <kevin.xie@...rfivetech.com>
Subject: Re: [PATCH v11 19/20] PCI: starfive: Add JH7110 PCIe controller

Minda Chen wrote:
> Add StarFive JH7110 SoC PCIe controller platform driver codes, JH7110
> with PLDA host PCIe core.
>
> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
> Co-developed-by: Kevin Xie <kevin.xie@...rfivetech.com>
> Reviewed-by: Mason Huo <mason.huo@...rfivetech.com>
> ---
>  MAINTAINERS                                 |   7 +
>  drivers/pci/controller/plda/Kconfig         |  11 +
>  drivers/pci/controller/plda/Makefile        |   1 +
>  drivers/pci/controller/plda/pcie-plda.h     |  71 ++-
>  drivers/pci/controller/plda/pcie-starfive.c | 460 ++++++++++++++++++++
>  drivers/pci/pci.h                           |   7 +
>  6 files changed, 556 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/pci/controller/plda/pcie-starfive.c
>

...

> +
> +static int starfive_pcie_parse_dt(struct starfive_jh7110_pcie *pcie,
> +				  struct device *dev)
> +{
> +	int domain_nr;
> +
> +	pcie->num_clks = devm_clk_bulk_get_all(dev, &pcie->clks);
> +	if (pcie->num_clks < 0)
> +		return dev_err_probe(dev, -ENODEV,
> +				     "failed to get pcie clocks\n");

Hi Minda,

>From Damian's mail I noticed that this should propagate the error from
devm_clk_bulk_get_all() properly, so -EPROBE is converted to an -ENODEV error.
Eg.

	if (pcie->num_clks < 0)
		return dev_err_probe(dev, pcie->num_clks,
				     "failed to get pcie clocks\n");

> +
> +	pcie->resets = devm_reset_control_array_get_exclusive(dev);
> +	if (IS_ERR(pcie->resets))
> +		return dev_err_probe(dev, PTR_ERR(pcie->resets),
> +				     "failed to get pcie resets");
> +
> +	pcie->reg_syscon =
> +		syscon_regmap_lookup_by_phandle(dev->of_node,
> +						"starfive,stg-syscon");
> +
> +	if (IS_ERR(pcie->reg_syscon))
> +		return dev_err_probe(dev, PTR_ERR(pcie->reg_syscon),
> +				     "failed to parse starfive,stg-syscon\n");
> +
> +	pcie->phy = devm_phy_optional_get(dev, NULL);
> +	if (IS_ERR(pcie->phy))
> +		return dev_err_probe(dev, PTR_ERR(pcie->phy),
> +				     "failed to get pcie phy\n");
> +
> +	domain_nr = of_get_pci_domain_nr(dev->of_node);
> +
> +	if (domain_nr < 0 || domain_nr > 1)
> +		return dev_err_probe(dev, -ENODEV,
> +				     "failed to get valid pcie domain\n");
> +
> +	if (domain_nr == 0)
> +		pcie->stg_pcie_base = STG_SYSCON_PCIE0_BASE;
> +	else
> +		pcie->stg_pcie_base = STG_SYSCON_PCIE1_BASE;
> +
> +	pcie->reset_gpio = devm_gpiod_get_optional(dev, "perst",
> +						   GPIOD_OUT_HIGH);
> +	if (IS_ERR(pcie->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(pcie->reset_gpio),
> +				     "failed to get perst-gpio\n");
> +
> +	pcie->power_gpio = devm_gpiod_get_optional(dev, "enable",
> +						   GPIOD_OUT_LOW);
> +	if (IS_ERR(pcie->power_gpio))
> +		return dev_err_probe(dev, PTR_ERR(pcie->power_gpio),
> +				     "failed to get power-gpio\n");
> +
> +	return 0;
> +}