linux-kernel - [PATCH v2 2/2] clk: aspeed: Add RMII RCLK gates for both AST2500 MACs

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Date:   Thu, 10 Oct 2019 12:36:55 +1030
From:   Andrew Jeffery <andrew@...id.au>
To:     linux-clk@...r.kernel.org
Cc:     mturquette@...libre.com, sboyd@...nel.org, joel@....id.au,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v2 2/2] clk: aspeed: Add RMII RCLK gates for both AST2500 MACs

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@...id.au>
---
v2: Drop "-gate" from clock names

 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..411ff5fb2c07 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", "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_MAC1RCLK] = hw;
+
+		/* RMII2 50MHz (RCLK) output enable */
+		hw = clk_hw_register_gate(dev, "mac2rclk", "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_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