linux-kernel - [PATCH 13/15] dt: binding: add binding for TZ1090 divider clock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 19 Nov 2014 23:15:41 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Mike Turquette <mturquette@...aro.org>,
	linux-metag@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc:	James Hogan <james.hogan@...tec.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: [PATCH 13/15] dt: binding: add binding for TZ1090 divider clock

Add binding for TZ1090 divider clock. This supports a subset of the
functionality of the generic divider, and by being specific to the
TZ1090 SoC it allows policy decisions to be made from the driver.

Signed-off-by: James Hogan <james.hogan@...tec.com>
Cc: Mike Turquette <mturquette@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Pawel Moll <pawel.moll@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
Cc: Kumar Gala <galak@...eaurora.org>
Cc: linux-metag@...r.kernel.org
Cc: devicetree@...r.kernel.org
---
 .../bindings/clock/img,tz1090-divider.txt          | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-divider.txt

diff --git a/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt b/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
new file mode 100644
index 0000000..25f9b9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
@@ -0,0 +1,37 @@
+Binding for TZ1090 simple divider clock.
+
+This binding uses the common clock binding[1]. It assumes a register-mapped
+adjustable clock rate divider that does not gate and has only one input clock or
+parent. The value programmed into the register is one less than the actual
+divisor value. E.g:
+
+register value		actual divisor value
+0			1
+1			2
+2			3
+
+The binding must also provide the register to control the divider and the mask
+for the corresponding control bits. The shift is calculated from the mask as
+(ffs(mask) - 1)
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : shall be "divider-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : link to phandle of parent clock
+- reg : base address for register controlling adjustable divider
+- bit-mask : arbitrary bitmask for programming the adjustable divider
+
+Optional properties:
+- clock-output-names : from common clock binding.
+
+Examples:
+	sys_clk_div: sys_clk_div {
+		compatible = "img,tz1090-divider";
+		#clock-cells = <0>;
+		clocks = <&sys_pll>;
+		reg = <0x02005914 0x4>;	/* CR_TOP_SYSCLK_DIV */
+		bit-mask = <0xff>;	/* CR_TOP_SYSDIV */
+		clock-output-names = "sys_div";
+	};
-- 
2.0.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/