linux-kernel - [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks

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Date:   Fri,  8 Sep 2017 17:35:57 +0200
From:   Romain Izard <romain.izard.pro@...il.com>
To:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Wenyou Yang <wenyou.yang@...el.com>,
        Josh Wu <rainyfeeling@...look.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Thierry Reding <thierry.reding@...il.com>,
        Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Romain Izard <romain.izard@...ile-devices.fr>,
        Romain Izard <romain.izard.pro@...il.com>
Subject: [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks

From: Romain Izard <romain.izard@...ile-devices.fr>

Save and restore the System Clock and Programmable Clock register for
the backup use case.

Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
---
 drivers/clk/at91/pmc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 07dc2861ad3f..5421b03553ec 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -66,6 +66,7 @@ static struct
 	u32 pcr[PMC_MAX_IDS];
 	u32 audio_pll0;
 	u32 audio_pll1;
+	u32 pckr[3];
 } pmc_cache;
 
 void pmc_register_id(u8 id)
@@ -103,6 +104,8 @@ static int pmc_suspend(void)
 		regmap_read(pmcreg, AT91_PMC_PCR,
 			    &pmc_cache.pcr[registered_ids[i]]);
 	}
+	for (i = 0; i < 3; i++)
+		regmap_read(pmcreg, AT91_PMC_PCKR(i), &pmc_cache.pckr[i]);
 
 	return 0;
 }
@@ -143,6 +146,8 @@ static void pmc_resume(void)
 			     pmc_cache.pcr[registered_ids[i]] |
 			     AT91_PMC_PCR_CMD);
 	}
+	for (i = 0; i < 3; i++)
+		regmap_write(pmcreg, AT91_PMC_PCKR(i), pmc_cache.pckr[i]);
 
 	if (pmc_cache.uckr & AT91_PMC_UPLLEN)
 		mask |= AT91_PMC_LOCKU;
-- 
2.11.0