Hi Neil,

On 21 October 2016 at 10:44, Neil Armstrong [off-list ref] wrote:

Add Synopsys Designware MAC Glue layer for the Oxford Semiconductor OX820.

Signed-off-by: Neil Armstrong <redacted>
---
 .../devicetree/bindings/net/oxnas-dwmac.txt        |  44 +++++
 drivers/net/ethernet/stmicro/stmmac/Kconfig        |  11 ++
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c  | 219 +++++++++++++++++++++
 4 files changed, 275 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/oxnas-dwmac.txt
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c

Changes since RFC at https://patchwork.kernel.org/patch/9387257 :
 - Drop init/exit callbacks
 - Implement proper remove and PM callback
 - Call init from probe
 - Disable/Unprepare clock if stmmac probe fails

<snip>

You might want to check the return value from clk_prepare_enable() as well.

+
+       ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
+       if (ret < 0)
+               return ret;
+
+       /* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
+       value |= BIT(DWMAC_CKEN_GTX);
+       /* Use simple mux for 25/125 Mhz clock switching */
+       value |= BIT(DWMAC_SIMPLE_MUX);
+       /* set auto switch tx clock source */
+       value |= BIT(DWMAC_AUTO_TX_SOURCE);
+       /* enable tx & rx vardelay */
+       value |= BIT(DWMAC_CKEN_TX_OUT);
+       value |= BIT(DWMAC_CKEN_TXN_OUT);
+       value |= BIT(DWMAC_CKEN_TX_IN);
+       value |= BIT(DWMAC_CKEN_RX_OUT);
+       value |= BIT(DWMAC_CKEN_RXN_OUT);
+       value |= BIT(DWMAC_CKEN_RX_IN);
+       regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
+
+       /* set tx & rx vardelay */
+       value = DWMAC_TX_VARDELAY(4);
+       value |= DWMAC_TXN_VARDELAY(2);
+       value |= DWMAC_RX_VARDELAY(10);
+       value |= DWMAC_RXN_VARDELAY(8);
+       regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
+
+       return 0;
+}
+
+static int oxnas_dwmac_probe(struct platform_device *pdev)
+{
+       struct plat_stmmacenet_data *plat_dat;
+       struct stmmac_resources stmmac_res;
+       struct device_node *sysctrl;
+       struct oxnas_dwmac *dwmac;
+       int ret;
+
+       sysctrl = of_parse_phandle(pdev->dev.of_node, "oxsemi,sys-ctrl", 0);
+       if (!sysctrl) {
+               dev_err(&pdev->dev, "failed to get sys-ctrl node\n");
+               return -EINVAL;
+       }
+
+       ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+       if (ret)
+               return ret;
+
+       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       if (IS_ERR(plat_dat))
+               return PTR_ERR(plat_dat);
+
+       dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+       if (!dwmac)
+               return -ENOMEM;
+
+       dwmac->dev = &pdev->dev;
+       plat_dat->bsp_priv = dwmac;
+
+       dwmac->regmap = syscon_node_to_regmap(sysctrl);
+       if (IS_ERR(dwmac->regmap)) {
+               dev_err(&pdev->dev, "failed to have sysctrl regmap\n");
+               return PTR_ERR(dwmac->regmap);
+       }
+
+       dwmac->clk = devm_clk_get(&pdev->dev, "gmac");
+       if (IS_ERR(dwmac->clk))
+               return PTR_ERR(dwmac->clk);
+
+       ret = oxnas_dwmac_init(dwmac);
+       if (ret)
+               return ret;
+
+       ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+       if (ret)
+               clk_disable_unprepare(dwmac->clk);
+
+       return ret;
+}
+
+static int oxnas_dwmac_remove(struct platform_device *pdev)
+{
+       struct net_device *ndev = platform_get_drvdata(pdev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       struct oxnas_dwmac *dwmac = priv->plat->bsp_priv;

Instead of this long dance of variables use the get_stmmac_bsp_priv()-helper.

You can take a look at dwmac-meson8b.c for reference.

+       int ret = stmmac_dvr_remove(&pdev->dev);
+
+       clk_disable_unprepare(dwmac->clk);
+
+       return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int oxnas_dwmac_suspend(struct device *dev)
+{
+       struct net_device *ndev = dev_get_drvdata(dev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       struct oxnas_dwmac *dwmac = priv->plat->bsp_priv;

get_stmmac_bsp_priv()

+       int ret;
+
+       ret = stmmac_suspend(dev);
+       clk_disable_unprepare(dwmac->clk);
+
+       return ret;
+}
+
+static int oxnas_dwmac_resume(struct device *dev)
+{
+       struct net_device *ndev = dev_get_drvdata(dev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       struct oxnas_dwmac *dwmac = priv->plat->bsp_priv;

get_stmmac_bsp_priv()

+       int ret;
+
+       ret = oxnas_dwmac_init(dwmac);
+       if (ret)
+               return ret;
+
+       ret = stmmac_resume(dev);
+
+       return ret;
+}
+#endif /* CONFIG_PM_SLEEP */

With these changes:
Acked-by: Joachim Eastwood <redacted>


best regards,
Joachim Eastwood