linux-kernel - [PATCH 8/8] clk: at91: sama7g5: register cpu clock

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Message-ID: <1604482802-1647-9-git-send-email-claudiu.beznea@microchip.com>
Date:   Wed, 4 Nov 2020 11:40:02 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <robh+dt@...nel.org>
CC:     <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 8/8] clk: at91: sama7g5: register cpu clock

Register CPU clock as being the master clock prescaler. This would
be used by DVFS. The block diagram of SAMA7G5's PMC contains also a divider
between master clock prescaler and CPU (PMC_CPU_RATIO.RATIO) but the
frequencies supported by SAMA7G5 could be directly received from
CPUPLL + master clock prescaler and the extra divider would do no work in
case it would be enabled.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/clk/at91/sama7g5.c       | 13 ++++++-------
 include/dt-bindings/clock/at91.h |  1 +
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/at91/sama7g5.c b/drivers/clk/at91/sama7g5.c
index d38766c6fc8c..b712dd273a0b 100644
--- a/drivers/clk/at91/sama7g5.c
+++ b/drivers/clk/at91/sama7g5.c
@@ -852,7 +852,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
 	if (IS_ERR(regmap))
 		return;
 
-	sama7g5_pmc = pmc_data_allocate(PMC_ETHPLL + 1,
+	sama7g5_pmc = pmc_data_allocate(PMC_CPU + 1,
 					nck(sama7g5_systemck),
 					nck(sama7g5_periphck),
 					nck(sama7g5_gck), 8);
@@ -929,18 +929,17 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
 		}
 	}
 
-	parent_names[0] = md_slck_name;
-	parent_names[1] = "mainck";
-	parent_names[2] = "cpupll_divpmcck";
-	parent_names[3] = "syspll_divpmcck";
-	hw = at91_clk_register_master_pres(regmap, "mck0_pres", 4, parent_names,
+	parent_names[0] = "cpupll_divpmcck";
+	hw = at91_clk_register_master_pres(regmap, "cpuck", 1, parent_names,
 					   &mck0_layout, &mck0_characteristics,
 					   &pmc_mck0_lock,
 					   CLK_SET_RATE_PARENT, 0);
 	if (IS_ERR(hw))
 		goto err_free;
 
-	hw = at91_clk_register_master_div(regmap, "mck0_div", "mck0_pres",
+	sama7g5_pmc->chws[PMC_CPU] = hw;
+
+	hw = at91_clk_register_master_div(regmap, "mck0", "cpuck",
 					  &mck0_layout, &mck0_characteristics,
 					  &pmc_mck0_lock, 0);
 	if (IS_ERR(hw))
diff --git a/include/dt-bindings/clock/at91.h b/include/dt-bindings/clock/at91.h
index fab313f62e8f..98e1b2ab6403 100644
--- a/include/dt-bindings/clock/at91.h
+++ b/include/dt-bindings/clock/at91.h
@@ -34,6 +34,7 @@
 #define PMC_AUDIOPMCPLL		(PMC_MAIN + 6)
 #define PMC_AUDIOIOPLL		(PMC_MAIN + 7)
 #define PMC_ETHPLL		(PMC_MAIN + 8)
+#define PMC_CPU			(PMC_MAIN + 9)
 
 #ifndef AT91_PMC_MOSCS
 #define AT91_PMC_MOSCS		0		/* MOSCS Flag */
-- 
2.7.4