linux-kernel - [PATCH 02/08] clocksource: sh_cmt: Use 0x3f mask for SH_CMT

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Message-Id: <20150621080927.10187.98007.sendpatchset@little-apple>
Date:	Sun, 21 Jun 2015 17:09:27 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	devicetree@...r.kernel.org,
	laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
	linux-sh@...r.kernel.org, daniel.lezcano@...aro.org,
	horms+renesas@...ge.net.au, Magnus Damm <magnus.damm@...il.com>,
	tglx@...utronix.de
Subject: [PATCH 02/08] clocksource: sh_cmt: Use 0x3f mask for SH_CMT_48BIT case

From: Magnus Damm <damm+renesas@...nsource.se>

Always use 0x3f as channel mask for the SH_CMT_48BIT type of devices.
Once this patch is applied the "renesas,channels-mask" property will
be ignored by the driver for older devices matching SH_CMT_48BIT. In
the future when all CMT types store channel mask in the driver then
we will be able to deprecate and remove "renesas,channels-mask" from DTS.

Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
---

 drivers/clocksource/sh_cmt.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

--- 0001/drivers/clocksource/sh_cmt.c
+++ work/drivers/clocksource/sh_cmt.c	2015-06-20 15:25:54.302366518 +0900
@@ -74,6 +74,8 @@ enum sh_cmt_model {
 struct sh_cmt_info {
 	enum sh_cmt_model model;
 
+	unsigned long channels_mask;
+
 	unsigned long width; /* 16 or 32 bit version of hardware block */
 	unsigned long overflow_bit;
 	unsigned long clear_bits;
@@ -212,6 +214,7 @@ static const struct sh_cmt_info sh_cmt_i
 	},
 	[SH_CMT_48BIT] = {
 		.model = SH_CMT_48BIT,
+		.channels_mask = 0x3f,
 		.width = 32,
 		.overflow_bit = SH_CMT32_CMCSR_CMF,
 		.clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
@@ -969,9 +972,14 @@ static int sh_cmt_setup(struct sh_cmt_de
 		id = of_match_node(sh_cmt_of_table, pdev->dev.of_node);
 		cmt->info = id->data;
 
-		ret = sh_cmt_parse_dt(cmt);
-		if (ret < 0)
-			return ret;
+		/* prefer in-driver channel configuration over DT */
+		if (cmt->info->channels_mask) {
+			cmt->hw_channels = cmt->info_channels_mask;
+		} else {
+			ret = sh_cmt_parse_dt(cmt);
+			if (ret < 0)
+				return ret;
+		}
 	} else if (pdev->dev.platform_data) {
 		struct sh_timer_config *cfg = pdev->dev.platform_data;
 		const struct platform_device_id *id = pdev->id_entry;
--
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