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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: jbrunet@baylibre.com, linux-amlogic@lists.infradead.org
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, narmstrong@baylibre.com
Subject: [PATCH] clk: meson: meson8b: Drop CLK_IS_CRITICAL from fclk_div2
Date: Sat, 20 Jun 2020 18:14:22 +0200	[thread overview]
Message-ID: <20200620161422.24114-1-martin.blumenstingl@googlemail.com> (raw)

Drop CLK_IS_CRITICAL from fclk_div2. This was added because we didn't
know the relation between this clock and RGMII Ethernet. It turns out
that fclk_div2 is used as "timing adjustment clock" to generate the RX
delay on the MAC side - which was enabled by u-boot on Odriod-C1. When
using the RX delay on the PHY side or not using a RX delay at all then
this clock can be disabled.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/meson/meson8b.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index edc09d050ecf..3d826711c820 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -293,13 +293,6 @@ static struct clk_regmap meson8b_fclk_div2 = {
 			&meson8b_fclk_div2_div.hw
 		},
 		.num_parents = 1,
-		/*
-		 * FIXME: Ethernet with a RGMII PHYs is not working if
-		 * fclk_div2 is disabled. it is currently unclear why this
-		 * is. keep it enabled until the Ethernet driver knows how
-		 * to manage this clock.
-		 */
-		.flags = CLK_IS_CRITICAL,
 	},
 };
 
-- 
2.27.0


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             reply	other threads:[~2020-06-20 16:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-20 16:14 Martin Blumenstingl [this message]
2020-06-25  6:30 ` [PATCH] clk: meson: meson8b: Drop CLK_IS_CRITICAL from fclk_div2 Jerome Brunet
2020-08-17 17:48 ` patchwork-bot+linux-amlogic

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