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Message-ID: <20191101121802.GD9723@e119886-lin.cambridge.arm.com>
Date: Fri, 1 Nov 2019 12:18:04 +0000
From: Andrew Murray <andrew.murray@....com>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: linux-mips@...r.kernel.org, davem@...emloft.net,
robh+dt@...nel.org, mark.rutland@....com, axboe@...nel.dk,
peppe.cavallaro@...com, alexandre.torgue@...com,
joabreu@...opsys.com, bhelgaas@...gle.com, netdev@...r.kernel.org,
devicetree@...r.kernel.org, linux-ide@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: Re: [PATCH 2/5] net: stmmac: Split devicetree parse
On Wed, Oct 30, 2019 at 09:53:44PM +0800, Jiaxun Yang wrote:
> PCI based devices can share devicetree info parse with platform
> device based devices after split dt parse frpm dt probe.
s/frpm/from/
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> .../ethernet/stmicro/stmmac/stmmac_platform.c | 63 ++++++++++++++-----
> .../ethernet/stmicro/stmmac/stmmac_platform.h | 3 +
> 2 files changed, 49 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 170c3a052b14..7e29bc76b7c3 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -385,25 +385,19 @@ static int stmmac_of_get_mac_mode(struct device_node *np)
> }
>
> /**
> - * stmmac_probe_config_dt - parse device-tree driver parameters
> - * @pdev: platform_device structure
> - * @mac: MAC address to use
> + * stmmac_parse_config_dt - parse device-tree driver parameters
> + * @np: device_mode structure
> + * @plat: plat_stmmacenet_data structure
> * Description:
> * this function is to read the driver parameters from device-tree and
> * set some private fields that will be used by the main at runtime.
> */
> -struct plat_stmmacenet_data *
> -stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> +int stmmac_parse_config_dt(struct device_node *np,
> + struct plat_stmmacenet_data *plat)
> {
> - struct device_node *np = pdev->dev.of_node;
> - struct plat_stmmacenet_data *plat;
> struct stmmac_dma_cfg *dma_cfg;
> int rc;
>
> - plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
> - if (!plat)
> - return ERR_PTR(-ENOMEM);
> -
> *mac = of_get_mac_address(np);
> if (IS_ERR(*mac)) {
> if (PTR_ERR(*mac) == -EPROBE_DEFER)
> @@ -414,7 +408,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>
> plat->phy_interface = of_get_phy_mode(np);
> if (plat->phy_interface < 0)
> - return ERR_PTR(plat->phy_interface);
> + return plat->phy_interface;
>
> plat->interface = stmmac_of_get_mac_mode(np);
> if (plat->interface < 0)
> @@ -453,7 +447,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> /* To Configure PHY by using all device-tree supported properties */
> rc = stmmac_dt_phy(plat, np, &pdev->dev);
> if (rc)
> - return ERR_PTR(rc);
> + return rc;
>
> of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
>
> @@ -531,7 +525,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> GFP_KERNEL);
> if (!dma_cfg) {
> stmmac_remove_config_dt(pdev, plat);
> - return ERR_PTR(-ENOMEM);
> + return -ENOMEM;
> }
> plat->dma_cfg = dma_cfg;
>
> @@ -560,7 +554,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> rc = stmmac_mtl_setup(pdev, plat);
> if (rc) {
> stmmac_remove_config_dt(pdev, plat);
> - return ERR_PTR(rc);
> + return rc;
> }
>
> /* clock setup */
> @@ -604,14 +598,43 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> plat->stmmac_rst = NULL;
> }
>
> - return plat;
> + return 0;
>
> error_hw_init:
> clk_disable_unprepare(plat->pclk);
> error_pclk_get:
> clk_disable_unprepare(plat->stmmac_clk);
>
> - return ERR_PTR(-EPROBE_DEFER);
> + return -EPROBE_DEFER;
> +}
> +
> +/**
> + * stmmac_probe_config_dt - probe and setup stmmac platform data by devicetree
> + * @pdev: platform_device structure
> + * @mac: MAC address to use
> + * Description:
> + * this function is to set up plat_stmmacenet_data private structure
> + * for platform drivers.
> + */
> +struct plat_stmmacenet_data *
> +stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct plat_stmmacenet_data *plat;
> + int rc;
> +
> + plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
> + if (!plat)
> + return ERR_PTR(-ENOMEM);
> +
> + rc = stmmac_parse_config_dt(np, plat);
> +
> + if (rc) {
> + free(plat);
Given the devm_kzalloc - is the free really needed here?
Thanks,
Andrew Murray
> + return ERR_PTR(rc);
> + }
> +
> + return plat;
> }
>
> /**
> @@ -628,6 +651,11 @@ void stmmac_remove_config_dt(struct platform_device *pdev,
> of_node_put(plat->mdio_node);
> }
> #else
> +int stmmac_parse_config_dt(struct device_node *np,
> + struct plat_stmmacenet_data *plat)
> +{
> + return -EINVAL;
> +}
> struct plat_stmmacenet_data *
> stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> {
> @@ -639,6 +667,7 @@ void stmmac_remove_config_dt(struct platform_device *pdev,
> {
> }
> #endif /* CONFIG_OF */
> +EXPORT_SYMBOL_GPL(stmmac_parse_config_dt);
> EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
> EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> index 3a4663b7b460..0e4aec1f502a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> @@ -11,6 +11,9 @@
>
> #include "stmmac.h"
>
> +int stmmac_parse_config_dt(struct device_node *np,
> + struct plat_stmmacenet_data *plat);
> +
> struct plat_stmmacenet_data *
> stmmac_probe_config_dt(struct platform_device *pdev, const char **mac);
> void stmmac_remove_config_dt(struct platform_device *pdev,
> --
> 2.23.0
>
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