linux-kernel - [PATCH] clk: at91: sam9x60: fix programmable clock prescaler

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Message-ID: <1575977088-16781-1-git-send-email-eugen.hristev@microchip.com>
Date:   Tue, 10 Dec 2019 11:25:19 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <alexandre.belloni@...tlin.com>
CC:     <Nicolas.Ferre@...rochip.com>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Eugen.Hristev@...rochip.com>
Subject: [PATCH] clk: at91: sam9x60: fix programmable clock prescaler

From: Eugen Hristev <eugen.hristev@...rochip.com>

The prescaler works as parent rate divided by (PRES + 1) (is_pres_direct == 1)
It does not work in the way of parent rate shifted to the right by (PRES + 1),
which means division by 2^(PRES + 1) (is_pres_direct == 0)
Thus is_pres_direct must be enabled for this SoC, to make the right computation.
This field was added in
commit 45b06682113b ("clk: at91: fix programmable clock for sama5d2")
SAM9X60 has the same field as SAMA5D2 in the PCK

Fixes: 01e2113de9a5 ("clk: at91: add sam9x60 pmc driver")
Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
 drivers/clk/at91/sam9x60.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
index 86238d5..77398ae 100644
--- a/drivers/clk/at91/sam9x60.c
+++ b/drivers/clk/at91/sam9x60.c
@@ -47,6 +47,7 @@ static const struct clk_programmable_layout sam9x60_programmable_layout = {
 	.pres_shift = 8,
 	.css_mask = 0x1f,
 	.have_slck_mck = 0,
+	.is_pres_direct = 1,
 };
 
 static const struct clk_pcr_layout sam9x60_pcr_layout = {
-- 
2.7.4