From mboxrd@z Thu Jan  1 00:00:00 1970
From: 21cnbao@gmail.com (Barry Song)
Date: Sun, 12 Apr 2015 18:24:37 +0800
Subject: [PATCH] clk: sirf: add CSR atlas7 clk and reset support
In-Reply-To: <20150411002358.18916.16856@quantum>
References: <1419495845-4345-1-git-send-email-21cnbao@gmail.com>
 <20150411002358.18916.16856@quantum>
Message-ID: <CAGsJ_4zUcZY2_rTeav521-1j-QGeHWF+ArO_dYoOSOYCJDNvEA@mail.gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

2015-04-11 8:23 GMT+08:00 Michael Turquette <mturquette@linaro.org>:
> Quoting Barry Song (2014-12-25 00:24:05)
>> From: Zhiwu Song <Zhiwu.Song@csr.com>
>>
>> the hardware node includes both clock and reset support, so it
>> is named as "car".
>> this patch implements Flexible clocks(mux, divider, gate), Selectable
>> clock(mux, divider, gate), root clock(gate),leaf clock(gate), others.
>> it also implements the reset controller functionality.
>>
>> Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
>> Signed-off-by: Barry Song <Baohua.Song@csr.com>
>> ---
>>  .../devicetree/bindings/clock/csr,atlas7-car.txt   |   46 +
>>  drivers/clk/sirf/Makefile                          |    2 +-
>>  drivers/clk/sirf/clk-atlas7.c                      | 1652 ++++++++++++++++++++
>>  3 files changed, 1699 insertions(+), 1 deletion(-)
>>  create mode 100644 Documentation/devicetree/bindings/clock/csr,atlas7-car.txt
>>  create mode 100644 drivers/clk/sirf/clk-atlas7.c
>>
>> diff --git a/Documentation/devicetree/bindings/clock/csr,atlas7-car.txt b/Documentation/devicetree/bindings/clock/csr,atlas7-car.txt
>> new file mode 100644
>> index 0000000..a1a9499
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/csr,atlas7-car.txt
>> @@ -0,0 +1,46 @@
>> +* Clock and reset bindings for CSR atlas7
>> +
>> +Required properties:
>> +- compatible: Should be "sirf,atlas7-car"
>> +- reg: Address and length of the register set
>> +- #clock-cells: Should be <1>
>> +- #reset-cells: Should be <1>
>> +
>> +The clock consumer should specify the desired clock by having the clock
>> +ID in its "clocks" phandle cell.
>> +The ID list atlas7_clks defined in drivers/clk/sirf/clk-atlas7.c
>> +
>> +The reset consumer should specify the desired reset by having the reset
>> +ID in its "reset" phandle cell.
>> +The ID list atlas7_reset_unit defined in drivers/clk/sirf/clk-atlas7.c
>> +
>> +Examples:
>> +
>> +timer at 10dc0000 {
>> +       compatible = "sirf,macro-tick";
>> +       reg = <0x10dc0000 0x1000>;
>> +       clocks = <&car 54>;
>> +       interrupts = <0 0 0>,
>> +                  <0 1 0>,
>> +                  <0 2 0>,
>> +                  <0 49 0>,
>> +                  <0 50 0>,
>> +                  <0 51 0>;
>> +};
>> +
>> +uart1: uart at 18020000 {
>> +       cell-index = <1>;
>> +       compatible = "sirf,macro-uart";
>> +       reg = <0x18020000 0x1000>;
>> +       clocks = <&clks 95>;
>> +       interrupts = <0 18 0>;
>> +       fifosize = <32>;
>> +};
>> +
>> +vpp at 13110000 {
>> +       compatible = "sirf,prima2-vpp";
>> +       reg = <0x13110000 0x10000>;
>> +       interrupts = <0 31 0>;
>> +       clocks = <&car 85>;
>> +       resets = <&car 29>;
>> +};
>
> It would be nice to provide an example of the clock provider node,
> "sirf,atlas7-car".

ok. Mike, thanks for reviewing.

> Also do you have a patch which adds this node to a
> dts file somewhere?
>

this has been done when atlas7 platform was added. see:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/atlas7.dtsi

there is a node:
            car: clock-controller at 18620000 {
                compatible = "sirf,atlas7-car";
                reg = <0x18620000 0x1000>;
                #clock-cells = <1>;
                #reset-cells = <1>;
            };

> Otherwise the rest of this patch looks OK.
>
> Regards,
> Mike

-barry