Re: [PATCH 3/3] net: sun8i-emac: Use common syscon setup for R40

On Fri, Jul 15, 2022 at 10:51 AM Samuel Holland samuel@sholland.org wrote:

While R40 puts the EMAC syscon register at a different address from other variants, the relevant portion of the register's layout is the same. Factor out the register offset so the same code can be shared by all variants. This matches what the Linux driver does.

This change provides two benefits beyond the simplification:

• R40 boards now respect the RX delays from the devicetree
• This resolves a warning on architectures where readl/writel expect the address to have a pointer type, not phys_addr_t.

Signed-off-by: Samuel Holland samuel@sholland.org

drivers/net/sun8i_emac.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c index 9cca8fa4e0a1..75ecb58e1e45 100644 --- a/drivers/net/sun8i_emac.c +++ b/drivers/net/sun8i_emac.c @@ -162,7 +162,7 @@ struct emac_eth_dev {

    enum emac_variant variant;
    void *mac_reg;

•   phys_addr_t sysctl_reg;
  

•   void *sysctl_reg;
    struct phy_device *phydev;
    struct mii_dev *bus;
    struct clk tx_clk;
  

@@ -317,18 +317,7 @@ static int sun8i_emac_set_syscon(struct sun8i_eth_pdata *pdata, { u32 reg;

•   if (priv->variant == R40_GMAC) {
  

•           /* Select RGMII for R40 */
  

•           reg = readl(priv->sysctl_reg + 0x164);
  

•           reg |= SC_ETCS_INT_GMII |
  

•                  SC_EPIT |
  

•                  (CONFIG_GMAC_TX_DELAY << SC_ETXDC_OFFSET);
  

•           writel(reg, priv->sysctl_reg + 0x164);
  

•           return 0;
  

•   }
  

•   reg = readl(priv->sysctl_reg + 0x30);
  

•   reg = readl(priv->sysctl_reg);
  
    reg = sun8i_emac_set_syscon_ephy(priv, reg);
  
  

@@ -369,7 +358,7 @@ static int sun8i_emac_set_syscon(struct sun8i_eth_pdata *pdata, reg |= ((pdata->rx_delay_ps / 100) << SC_ERXDC_OFFSET) & SC_ERXDC_MASK;

•   writel(reg, priv->sysctl_reg + 0x30);
  

•   writel(reg, priv->sysctl_reg);
  
    return 0;
  

} @@ -792,6 +781,7 @@ static int sun8i_emac_eth_of_to_plat(struct udevice *dev) struct sun8i_eth_pdata *sun8i_pdata = dev_get_plat(dev); struct eth_pdata *pdata = &sun8i_pdata->eth_pdata; struct emac_eth_dev *priv = dev_get_priv(dev);

•   phys_addr_t syscon_base;
    const fdt32_t *reg;
    int node = dev_of_offset(dev);
    int offset = 0;
  

@@ -837,13 +827,18 @@ static int sun8i_emac_eth_of_to_plat(struct udevice *dev) __func__); return -EINVAL; }

•   priv->sysctl_reg = fdt_translate_address((void *)gd->fdt_blob,
  

•                                            offset, reg);
  

•   if (priv->sysctl_reg == FDT_ADDR_T_NONE) {
  

•   syscon_base = fdt_translate_address((void *)gd->fdt_blob, offset, reg);
  

•   if (syscon_base == FDT_ADDR_T_NONE) {
            debug("%s: Cannot find syscon base address\n", __func__);
            return -EINVAL;
    }
  
  

•   if (priv->variant == R40_GMAC)
  

•           priv->sysctl_reg = (void *)syscon_base + 0x164;
  

•   else
  

•           priv->sysctl_reg = (void *)syscon_base + 0x30;
  

Better to get syscon fields from driver data as this driver support DM.

Jagan.