[PATCH 0/2] clk: aspeed: Expose RMII RCLK gate for MACs 1-2 on AST2500

[PATCH 0/2] clk: aspeed: Expose RMII RCLK gate for MACs 1-2 on AST2500

[Andrew Jeffery]

Hello,

This series is two small changes enable kernel support for controlling the RMII
RCLK gate on AST2500-based systems. Previously the kernel has assumed u-boot
has ungated RCLK for networking to function.

RMII is commonly used for NCSI, which itself is commonly used for BMC-based
designs to reduce cabling requirements for the platform.

Please review!

Andrew

Andrew Jeffery (2):
  dt-bindings: clock: Add AST2500 RMII RCLK definitions
  clk: aspeed: Add RMII RCLK gates for both AST2500 MACs

 drivers/clk/clk-aspeed.c                 | 27 +++++++++++++++++++++++-
 include/dt-bindings/clock/aspeed-clock.h |  2 ++
 2 files changed, 28 insertions(+), 1 deletion(-)

-- 
2.20.1

[PATCH 1/2] dt-bindings: clock: Add AST2500 RMII RCLK definitions

[Andrew Jeffery]

The AST2500 has an explicit gate for the RMII RCLK for each of the two
MACs.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
 include/dt-bindings/clock/aspeed-clock.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
index f43738607d77..64e245fb113f 100644
--- a/include/dt-bindings/clock/aspeed-clock.h
+++ b/include/dt-bindings/clock/aspeed-clock.h
@@ -39,6 +39,8 @@
 #define ASPEED_CLK_BCLK			33
 #define ASPEED_CLK_MPLL			34
 #define ASPEED_CLK_24M			35
+#define ASPEED_CLK_GATE_MAC1RCLK	36
+#define ASPEED_CLK_GATE_MAC2RCLK	37
 
 #define ASPEED_RESET_XDMA		0
 #define ASPEED_RESET_MCTP		1
-- 
2.20.1

[PATCH 2/2] clk: aspeed: Add RMII RCLK gates for both AST2500 MACs

[Andrew Jeffery]

RCLK is a fixed 50MHz clock derived from HPLL that is described by a
single gate for each MAC.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
 drivers/clk/clk-aspeed.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c
index abf06fb6453e..867d8771bb1e 100644
--- a/drivers/clk/clk-aspeed.c
+++ b/drivers/clk/clk-aspeed.c
@@ -14,7 +14,7 @@
 
 #include "clk-aspeed.h"
 
-#define ASPEED_NUM_CLKS		36
+#define ASPEED_NUM_CLKS		38
 
 #define ASPEED_RESET2_OFFSET	32
 
@@ -28,6 +28,7 @@
 #define  AST2400_HPLL_BYPASS_EN	BIT(17)
 #define ASPEED_MISC_CTRL	0x2c
 #define  UART_DIV13_EN		BIT(12)
+#define ASPEED_MAC_CLK_DLY	0x48
 #define ASPEED_STRAP		0x70
 #define  CLKIN_25MHZ_EN		BIT(23)
 #define  AST2400_CLK_SOURCE_SEL	BIT(18)
@@ -462,6 +463,30 @@ static int aspeed_clk_probe(struct platform_device *pdev)
 		return PTR_ERR(hw);
 	aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw;
 
+	if (of_device_is_compatible(pdev->dev.of_node, "aspeed,ast2500-scu")) {
+		/* RMII 50MHz RCLK */
+		hw = clk_hw_register_fixed_rate(dev, "mac12rclk", "hpll", 0,
+						50000000);
+		if (IS_ERR(hw))
+			return PTR_ERR(hw);
+
+		/* RMII1 50MHz (RCLK) output enable */
+		hw = clk_hw_register_gate(dev, "mac1rclk-gate", "mac12rclk", 0,
+				scu_base + ASPEED_MAC_CLK_DLY, 29, 0,
+				&aspeed_clk_lock);
+		if (IS_ERR(hw))
+			return PTR_ERR(hw);
+		aspeed_clk_data->hws[ASPEED_CLK_GATE_MAC1RCLK] = hw;
+
+		/* RMII2 50MHz (RCLK) output enable */
+		hw = clk_hw_register_gate(dev, "mac2rclk-gate", "mac12rclk", 0,
+				scu_base + ASPEED_MAC_CLK_DLY, 30, 0,
+				&aspeed_clk_lock);
+		if (IS_ERR(hw))
+			return PTR_ERR(hw);
+		aspeed_clk_data->hws[ASPEED_CLK_GATE_MAC2RCLK] = hw;
+	}
+
 	/* LPC Host (LHCLK) clock divider */
 	hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0,
 			scu_base + ASPEED_CLK_SELECTION, 20, 3, 0,
-- 
2.20.1

Re: [PATCH 1/2] dt-bindings: clock: Add AST2500 RMII RCLK definitions

[Joel Stanley]

On Tue, 8 Oct 2019 at 11:34, Andrew Jeffery <andrew@aj.id.au> wrote:
>
> The AST2500 has an explicit gate for the RMII RCLK for each of the two
> MACs.
>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> ---
>  include/dt-bindings/clock/aspeed-clock.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
> index f43738607d77..64e245fb113f 100644
> --- a/include/dt-bindings/clock/aspeed-clock.h
> +++ b/include/dt-bindings/clock/aspeed-clock.h
> @@ -39,6 +39,8 @@
>  #define ASPEED_CLK_BCLK                        33
>  #define ASPEED_CLK_MPLL                        34
>  #define ASPEED_CLK_24M                 35
> +#define ASPEED_CLK_GATE_MAC1RCLK       36
> +#define ASPEED_CLK_GATE_MAC2RCLK       37

Calling these ASPEED_CLK_GATE breaks the pattern the rest of the
driver has in using that name for the clocks that are registered as
struct aspeed_clk_gate clocks.

Do you think we should drop the GATE_ to match the existing clocks?


>
>  #define ASPEED_RESET_XDMA              0
>  #define ASPEED_RESET_MCTP              1
> --
> 2.20.1
>

Re: [PATCH 1/2] dt-bindings: clock: Add AST2500 RMII RCLK definitions

[Andrew Jeffery]

On Tue, 8 Oct 2019, at 23:07, Joel Stanley wrote:
> On Tue, 8 Oct 2019 at 11:34, Andrew Jeffery <andrew@aj.id.au> wrote:
> >
> > The AST2500 has an explicit gate for the RMII RCLK for each of the two
> > MACs.
> >
> > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > ---
> >  include/dt-bindings/clock/aspeed-clock.h | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
> > index f43738607d77..64e245fb113f 100644
> > --- a/include/dt-bindings/clock/aspeed-clock.h
> > +++ b/include/dt-bindings/clock/aspeed-clock.h
> > @@ -39,6 +39,8 @@
> >  #define ASPEED_CLK_BCLK                        33
> >  #define ASPEED_CLK_MPLL                        34
> >  #define ASPEED_CLK_24M                 35
> > +#define ASPEED_CLK_GATE_MAC1RCLK       36
> > +#define ASPEED_CLK_GATE_MAC2RCLK       37
> 
> Calling these ASPEED_CLK_GATE breaks the pattern the rest of the
> driver has in using that name for the clocks that are registered as
> struct aspeed_clk_gate clocks.
> 
> Do you think we should drop the GATE_ to match the existing clocks?

I named them that way because the bits in question do just gate the
clocks, but I've renamed them to keep the pattern. Will send a v2.

Andrew