[PATCH 0/3] nvmem: add lpc18xx OTP memory driver

[PATCH 0/3] nvmem: add lpc18xx OTP memory driver

[Joachim Eastwood]

This patch set adds a simple read-only nvmem driver for the
internal OTP (One Time Programmable) memory found on all
LPC18xx/43xx devices. Write support is coming later when
the required firmware driver for the boot ROM goes upstream.

Note that dtsi patch is only included for reference. I intend
to take it myself through the lpc18xx tree once the bindings
are accepted and the driver goes upstream.


Joachim Eastwood (3):
  nvmem: add NXP LPC18xx OTP driver
  nvmem: dt: document lpc1850 OTP binding
  ARM: dts: lpc18xx: add otp node

 .../devicetree/bindings/nvmem/lpc1850-otp.txt      |  20 ++++
 arch/arm/boot/dts/lpc18xx.dtsi                     |  12 ++
 drivers/nvmem/Kconfig                              |  10 ++
 drivers/nvmem/Makefile                             |   2 +
 drivers/nvmem/lpc18xx_otp.c                        | 123 +++++++++++++++++++++
 5 files changed, 167 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
 create mode 100644 drivers/nvmem/lpc18xx_otp.c

-- 
2.9.3

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[PATCH 2/3] nvmem: dt: document lpc1850 OTP binding

[Joachim Eastwood]

Documenation for the LPC18xx/43xx OTP memory bindings.

Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 .../devicetree/bindings/nvmem/lpc1850-otp.txt        | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt

diff --git a/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
new file mode 100644
index 0000000..853b6a7
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
@@ -0,0 +1,20 @@
+* NXP LPC18xx OTP memory
+
+Internal OTP (One Time Programmable) memory for NXP LPC18xx/43xx devices.
+
+Required properties:
+  - compatible: Should be "nxp,lpc1850-otp"
+  - reg: Must contain an entry with the physical base address and length
+    for each entry in reg-names.
+  - address-cells: must be set to 1.
+  - size-cells: must be set to 1.
+
+See nvmem.txt for more information.
+
+Example:
+  otp: otp@40045000 {
+    compatible = "nxp,lpc1850-otp";
+    reg = <0x40045000 0x1000>;
+    #address-cells = <1>;
+    #size-cells = <1>;
+  };
-- 
2.9.3

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Re: [PATCH 2/3] nvmem: dt: document lpc1850 OTP binding

[Rob Herring]

On Tue, Sep 13, 2016 at 06:12:40PM +0200, Joachim Eastwood wrote:
> Documenation for the LPC18xx/43xx OTP memory bindings.
> 
> Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  .../devicetree/bindings/nvmem/lpc1850-otp.txt        | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
> new file mode 100644
> index 0000000..853b6a7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
> @@ -0,0 +1,20 @@
> +* NXP LPC18xx OTP memory
> +
> +Internal OTP (One Time Programmable) memory for NXP LPC18xx/43xx devices.
> +
> +Required properties:
> +  - compatible: Should be "nxp,lpc1850-otp"
> +  - reg: Must contain an entry with the physical base address and length
> +    for each entry in reg-names.

> +  - address-cells: must be set to 1.
> +  - size-cells: must be set to 1.

Not needed unless you have child nodes.

> +
> +See nvmem.txt for more information.
> +
> +Example:
> +  otp: otp@40045000 {
> +    compatible = "nxp,lpc1850-otp";
> +    reg = <0x40045000 0x1000>;
> +    #address-cells = <1>;
> +    #size-cells = <1>;
> +  };
> -- 
> 2.9.3
> 
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Re: [PATCH 2/3] nvmem: dt: document lpc1850 OTP binding

[Joachim Eastwood]

On 23 September 2016 at 15:35, Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> On Tue, Sep 13, 2016 at 06:12:40PM +0200, Joachim Eastwood wrote:
>> Documenation for the LPC18xx/43xx OTP memory bindings.
>>
>> Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> ---
>>  .../devicetree/bindings/nvmem/lpc1850-otp.txt        | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>>
>> diff --git a/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>> new file mode 100644
>> index 0000000..853b6a7
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>> @@ -0,0 +1,20 @@
>> +* NXP LPC18xx OTP memory
>> +
>> +Internal OTP (One Time Programmable) memory for NXP LPC18xx/43xx devices.
>> +
>> +Required properties:
>> +  - compatible: Should be "nxp,lpc1850-otp"
>> +  - reg: Must contain an entry with the physical base address and length
>> +    for each entry in reg-names.
>
>> +  - address-cells: must be set to 1.
>> +  - size-cells: must be set to 1.
>
> Not needed unless you have child nodes.

They will have "nvmem" cell children. See patch 3/3

+                       /* Flashless devices has part ID in OTP bank 0 */
+                       part_id: identification@0 {
+                               reg = <0x0 0x10>;
+                       };

These cells are documented in nvmem.txt.


regards,
Joachim Eastwood
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[PATCH 3/3] ARM: dts: lpc18xx: add otp node

[Joachim Eastwood]

Add node for the internal OTP (One Time Programmable) memory found
on all LPC18xx/43xx SoCs.

Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/lpc18xx.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/lpc18xx.dtsi b/arch/arm/boot/dts/lpc18xx.dtsi
index c6508ed..7ef0bc8 100644
--- a/arch/arm/boot/dts/lpc18xx.dtsi
+++ b/arch/arm/boot/dts/lpc18xx.dtsi
@@ -250,6 +250,18 @@
 			};
 		};
 
+		otp@40045000 {
+			compatible = "nxp,lpc1850-otp";
+			reg = <0x40045000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			/* Flashless devices has part ID in OTP bank 0 */
+			part_id: identification@0 {
+				reg = <0x0 0x10>;
+			};
+		};
+
 		rtc: rtc@40046000 {
 			compatible = "nxp,lpc1850-rtc", "nxp,lpc1788-rtc";
 			reg = <0x40046000 0x1000>;
-- 
2.9.3

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