Some improvements:
- manage syscfg as optional clock,
- update slew rate of ETH_MDIO pin,
- Enable gating of the MAC TX clock during TX low-power mode
V2: Update with D.Miller remark
Christophe Roullier (4):
net: ethernet: stmmac: Add support for syscfg clock
ARM: dts: stm32: remove syscfg clock on stm32mp157c ethernet
ARM: dts: stm32: adjust slew rate for Ethernet
ARM: dts: stm32: Enable gating of the MAC TX clock during TX low-power
mode on stm32mp157c
arch/arm/boot/dts/stm32mp157-pinctrl.dtsi | 9 ++++--
arch/arm/boot/dts/stm32mp157c.dtsi | 7 ++--
.../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 32 ++++++++++++-------
3 files changed, 31 insertions(+), 17 deletions(-)
--
2.17.1
Add optional support for syscfg clock in dwmac-stm32.c
Now Syscfg clock is activated automatically when syscfg
registers are used
Signed-off-by: Christophe Roullier <[email protected]>
---
.../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 32 ++++++++++++-------
1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 4ef041bdf6a1..df7e9e913041 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -152,19 +152,24 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
int ret = 0;
if (prepare) {
- ret = clk_prepare_enable(dwmac->syscfg_clk);
- if (ret)
- return ret;
-
+ if (dwmac->syscfg_clk) {
+ ret = clk_prepare_enable(dwmac->syscfg_clk);
+ if (ret)
+ return ret;
+ }
if (dwmac->clk_eth_ck) {
ret = clk_prepare_enable(dwmac->clk_eth_ck);
if (ret) {
- clk_disable_unprepare(dwmac->syscfg_clk);
+ if (dwmac->syscfg_clk)
+ clk_disable_unprepare
+ (dwmac->syscfg_clk);
return ret;
}
}
} else {
- clk_disable_unprepare(dwmac->syscfg_clk);
+ if (dwmac->syscfg_clk)
+ clk_disable_unprepare(dwmac->syscfg_clk);
+
if (dwmac->clk_eth_ck)
clk_disable_unprepare(dwmac->clk_eth_ck);
}
@@ -296,7 +301,7 @@ static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
{
struct platform_device *pdev = to_platform_device(dev);
struct device_node *np = dev->of_node;
- int err = 0;
+ int err;
/* Gigabit Ethernet 125MHz clock selection. */
dwmac->eth_clk_sel_reg = of_property_read_bool(np, "st,eth-clk-sel");
@@ -320,13 +325,17 @@ static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
return PTR_ERR(dwmac->clk_ethstp);
}
- /* Clock for sysconfig */
+ /* Optional Clock for sysconfig */
dwmac->syscfg_clk = devm_clk_get(dev, "syscfg-clk");
if (IS_ERR(dwmac->syscfg_clk)) {
- dev_err(dev, "No syscfg clock provided...\n");
- return PTR_ERR(dwmac->syscfg_clk);
+ err = PTR_ERR(dwmac->syscfg_clk);
+ if (err != -ENOENT)
+ return err;
+ dwmac->syscfg_clk = NULL;
}
+ err = 0;
+
/* Get IRQ information early to have an ability to ask for deferred
* probe if needed before we went too far with resource allocation.
*/
@@ -436,7 +445,8 @@ static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
return ret;
clk_disable_unprepare(dwmac->clk_tx);
- clk_disable_unprepare(dwmac->syscfg_clk);
+ if (dwmac->syscfg_clk)
+ clk_disable_unprepare(dwmac->syscfg_clk);
if (dwmac->clk_eth_ck)
clk_disable_unprepare(dwmac->clk_eth_ck);
--
2.17.1
On Tue, Nov 05, 2019 at 01:45:02PM +0100, Christophe Roullier wrote:
> Add optional support for syscfg clock in dwmac-stm32.c
> Now Syscfg clock is activated automatically when syscfg
> registers are used
>
> Signed-off-by: Christophe Roullier <[email protected]>
> ---
> .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 32 ++++++++++++-------
> 1 file changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
> index 4ef041bdf6a1..df7e9e913041 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
> @@ -152,19 +152,24 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
> int ret = 0;
>
> if (prepare) {
> - ret = clk_prepare_enable(dwmac->syscfg_clk);
> - if (ret)
> - return ret;
> -
> + if (dwmac->syscfg_clk) {
> + ret = clk_prepare_enable(dwmac->syscfg_clk);
> + if (ret)
> + return ret;
> + }
Hi Christophe
All the clk_ API functions are happy to take a NULL point and then do
nothing. So you don't need these changes.
> - /* Clock for sysconfig */
> + /* Optional Clock for sysconfig */
> dwmac->syscfg_clk = devm_clk_get(dev, "syscfg-clk");
> if (IS_ERR(dwmac->syscfg_clk)) {
> - dev_err(dev, "No syscfg clock provided...\n");
> - return PTR_ERR(dwmac->syscfg_clk);
> + err = PTR_ERR(dwmac->syscfg_clk);
> + if (err != -ENOENT)
> + return err;
> + dwmac->syscfg_clk = NULL;
> }
>
> + err = 0;
> +
That should be all you need. Just set dwmac->syscfg_clk to NULL and
the rest should work.
Andrew