[net-next PATCH v1 1/3] net: stmmac: dwmac-meson8b: simplify clock registration
Martin Blumenstingl
martin.blumenstingl at googlemail.com
Sat Feb 17 06:08:18 PST 2018
To goal of this patch is to simplify the registration of the RGMII TX
clock (and it's parent clocks). This is achieved by:
- introducing the meson8b_dwmac_register_clk helper-function to remove
code duplication when registering a single clock (this saves a few
lines since we have 4 clocks internally)
- using devm_add_action_or_reset to disable the RGMII TX clock
automatically when needed. This also allows us to re-use the standard
stmmac_pltfr_remove function.
- devm_kasprintf() and devm_kstrdup() are not used anymore to generate
the clock name (these are replaced by a variable on the stack) because
the common clock framework already uses kstrdup() internally.
No functional changes intended.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
---
.../net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 156 +++++++++------------
1 file changed, 65 insertions(+), 91 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 5270d26f0bc6..84a9a900e74e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -55,17 +55,11 @@ struct meson8b_dwmac {
phy_interface_t phy_mode;
struct clk_mux m250_mux;
- struct clk *m250_mux_clk;
- struct clk *m250_mux_parent[MUX_CLK_NUM_PARENTS];
-
struct clk_divider m250_div;
- struct clk *m250_div_clk;
-
struct clk_fixed_factor fixed_div2;
- struct clk *fixed_div2_clk;
-
struct clk_gate rgmii_tx_en;
- struct clk *rgmii_tx_en_clk;
+
+ struct clk *rgmii_tx_clk;
u32 tx_delay_ns;
};
@@ -82,106 +76,95 @@ static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
writel(data, dwmac->regs + reg);
}
-static int meson8b_init_rgmii_tx_clk(struct meson8b_dwmac *dwmac)
+static struct clk *meson8b_dwmac_register_clk(struct meson8b_dwmac *dwmac,
+ const char *name_suffix,
+ const char **parent_names,
+ int num_parents,
+ const struct clk_ops *ops,
+ struct clk_hw *hw)
{
+ struct device *dev = &dwmac->pdev->dev;
struct clk_init_data init;
+ char clk_name[32];
+
+ snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev),
+ name_suffix);
+
+ init.name = clk_name;
+ init.ops = ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = parent_names;
+ init.num_parents = num_parents;
+
+ hw->init = &init;
+
+ return devm_clk_register(dev, hw);
+}
+
+static int meson8b_init_rgmii_tx_clk(struct meson8b_dwmac *dwmac)
+{
int i, ret;
+ struct clk *clk;
struct device *dev = &dwmac->pdev->dev;
- char clk_name[32];
- const char *clk_div_parents[1];
- const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+ const char *parent_name, *mux_parent_names[MUX_CLK_NUM_PARENTS];
/* get the mux parents from DT */
for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
char name[16];
snprintf(name, sizeof(name), "clkin%d", i);
- dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
- if (IS_ERR(dwmac->m250_mux_parent[i])) {
- ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+ clk = devm_clk_get(dev, name);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Missing clock %s\n", name);
return ret;
}
- mux_parent_names[i] =
- __clk_get_name(dwmac->m250_mux_parent[i]);
+ mux_parent_names[i] = __clk_get_name(clk);
}
- /* create the m250_mux */
- snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
- init.name = clk_name;
- init.ops = &clk_mux_ops;
- init.flags = CLK_SET_RATE_PARENT;
- init.parent_names = mux_parent_names;
- init.num_parents = MUX_CLK_NUM_PARENTS;
-
dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
- dwmac->m250_mux.flags = 0;
- dwmac->m250_mux.table = NULL;
- dwmac->m250_mux.hw.init = &init;
-
- dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
- if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
- return PTR_ERR(dwmac->m250_mux_clk);
-
- /* create the m250_div */
- snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
- init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
- init.ops = &clk_divider_ops;
- init.flags = CLK_SET_RATE_PARENT;
- clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
- init.parent_names = clk_div_parents;
- init.num_parents = ARRAY_SIZE(clk_div_parents);
+ clk = meson8b_dwmac_register_clk(dwmac, "m250_sel", mux_parent_names,
+ MUX_CLK_NUM_PARENTS, &clk_mux_ops,
+ &dwmac->m250_mux.hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
+ parent_name = __clk_get_name(clk);
dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
- dwmac->m250_div.hw.init = &init;
dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO |
CLK_DIVIDER_ROUND_CLOSEST;
+ clk = meson8b_dwmac_register_clk(dwmac, "m250_div", &parent_name, 1,
+ &clk_divider_ops,
+ &dwmac->m250_div.hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
- dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
- if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
- return PTR_ERR(dwmac->m250_div_clk);
-
- /* create the fixed_div2 */
- snprintf(clk_name, sizeof(clk_name), "%s#fixed_div2", dev_name(dev));
- init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
- init.ops = &clk_fixed_factor_ops;
- init.flags = CLK_SET_RATE_PARENT;
- clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
- init.parent_names = clk_div_parents;
- init.num_parents = ARRAY_SIZE(clk_div_parents);
-
+ parent_name = __clk_get_name(clk);
dwmac->fixed_div2.mult = 1;
dwmac->fixed_div2.div = 2;
- dwmac->fixed_div2.hw.init = &init;
-
- dwmac->fixed_div2_clk = devm_clk_register(dev, &dwmac->fixed_div2.hw);
- if (WARN_ON(IS_ERR(dwmac->fixed_div2_clk)))
- return PTR_ERR(dwmac->fixed_div2_clk);
-
- /* create the rgmii_tx_en */
- init.name = devm_kasprintf(dev, GFP_KERNEL, "%s#rgmii_tx_en",
- dev_name(dev));
- init.ops = &clk_gate_ops;
- init.flags = CLK_SET_RATE_PARENT;
- clk_div_parents[0] = __clk_get_name(dwmac->fixed_div2_clk);
- init.parent_names = clk_div_parents;
- init.num_parents = ARRAY_SIZE(clk_div_parents);
+ clk = meson8b_dwmac_register_clk(dwmac, "fixed_div2", &parent_name, 1,
+ &clk_fixed_factor_ops,
+ &dwmac->fixed_div2.hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
+ parent_name = __clk_get_name(clk);
dwmac->rgmii_tx_en.reg = dwmac->regs + PRG_ETH0;
dwmac->rgmii_tx_en.bit_idx = PRG_ETH0_RGMII_TX_CLK_EN;
- dwmac->rgmii_tx_en.hw.init = &init;
+ clk = meson8b_dwmac_register_clk(dwmac, "rgmii_tx_en", &parent_name, 1,
+ &clk_gate_ops,
+ &dwmac->rgmii_tx_en.hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
- dwmac->rgmii_tx_en_clk = devm_clk_register(dev,
- &dwmac->rgmii_tx_en.hw);
- if (WARN_ON(IS_ERR(dwmac->rgmii_tx_en_clk)))
- return PTR_ERR(dwmac->rgmii_tx_en_clk);
+ dwmac->rgmii_tx_clk = clk;
return 0;
}
@@ -219,19 +202,23 @@ static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
* a register) based on the line-speed (125MHz for Gbit speeds,
* 25MHz for 100Mbit/s and 2.5MHz for 10Mbit/s).
*/
- ret = clk_set_rate(dwmac->rgmii_tx_en_clk, 125 * 1000 * 1000);
+ ret = clk_set_rate(dwmac->rgmii_tx_clk, 125 * 1000 * 1000);
if (ret) {
dev_err(&dwmac->pdev->dev,
"failed to set RGMII TX clock\n");
return ret;
}
- ret = clk_prepare_enable(dwmac->rgmii_tx_en_clk);
+ ret = clk_prepare_enable(dwmac->rgmii_tx_clk);
if (ret) {
dev_err(&dwmac->pdev->dev,
"failed to enable the RGMII TX clock\n");
return ret;
}
+
+ devm_add_action_or_reset(&dwmac->pdev->dev,
+ (void(*)(void *))clk_disable_unprepare,
+ dwmac->rgmii_tx_clk);
break;
case PHY_INTERFACE_MODE_RMII:
@@ -317,29 +304,16 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
- goto err_clk_disable;
+ goto err_remove_config_dt;
return 0;
-err_clk_disable:
- if (phy_interface_mode_is_rgmii(dwmac->phy_mode))
- clk_disable_unprepare(dwmac->rgmii_tx_en_clk);
err_remove_config_dt:
stmmac_remove_config_dt(pdev, plat_dat);
return ret;
}
-static int meson8b_dwmac_remove(struct platform_device *pdev)
-{
- struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
-
- if (phy_interface_mode_is_rgmii(dwmac->phy_mode))
- clk_disable_unprepare(dwmac->rgmii_tx_en_clk);
-
- return stmmac_pltfr_remove(pdev);
-}
-
static const struct of_device_id meson8b_dwmac_match[] = {
{ .compatible = "amlogic,meson8b-dwmac" },
{ .compatible = "amlogic,meson-gxbb-dwmac" },
@@ -349,7 +323,7 @@ MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
static struct platform_driver meson8b_dwmac_driver = {
.probe = meson8b_dwmac_probe,
- .remove = meson8b_dwmac_remove,
+ .remove = stmmac_pltfr_remove,
.driver = {
.name = "meson8b-dwmac",
.pm = &stmmac_pltfr_pm_ops,
--
2.16.1
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