linux-kernel - Re: [PATCH 7/7] tty: serial: lantiq: Add CCF support

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Date:   Thu, 14 Jun 2018 14:38:06 +0800
From:   "Wu, Songjun" <songjun.wu@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>
Cc:     hua.ma@...ux.intel.com, yixin.zhu@...ux.intel.com,
        chuanhua.lei@...ux.intel.com, linux-mips@...ux-mips.org,
        qi-ming.wu@...el.com, linux-clk@...r.kernel.org,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 7/7] tty: serial: lantiq: Add CCF support



On 6/13/2018 6:39 AM, Rob Herring wrote:
> On Tue, Jun 12, 2018 at 01:40:34PM +0800, Songjun Wu wrote:
>> Previous implementation uses platform-dependent API to get the clock.
>> Those functions are not available for other SoC which uses the same IP.
>> The CCF (Common Clock Framework) have an abstraction based APIs
>> for clock.
>> Change to use CCF APIs to get clock and rate.
>> So that different SoCs can use the same driver.
>> Clocks and clock-names are updated in device tree binding.
>>
>> Signed-off-by: Songjun Wu <songjun.wu@...ux.intel.com>
>>
>> ---
>>
>>   .../devicetree/bindings/serial/lantiq_asc.txt      |  15 +++
> Please split bindings to separate patch.
Thanks.
It will be split to two separate patches, one for bindings, the other 
for code.
>>   drivers/tty/serial/Kconfig                         |   2 +-
>>   drivers/tty/serial/lantiq.c                        | 101 +++++++++++++++++----
>>   3 files changed, 98 insertions(+), 20 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/serial/lantiq_asc.txt b/Documentation/devicetree/bindings/serial/lantiq_asc.txt
>> index 3acbd309ab9d..608f0c87a4af 100644
>> --- a/Documentation/devicetree/bindings/serial/lantiq_asc.txt
>> +++ b/Documentation/devicetree/bindings/serial/lantiq_asc.txt
>> @@ -6,6 +6,10 @@ Required properties:
>>   - interrupts: the 3 (tx rx err) interrupt numbers. The interrupt specifier
>>     depends on the interrupt-parent interrupt controller.
>>   
>> +Optional properties:
>> +- clocks: Should contain frequency clock and gate clock
>> +- clock-names: Should be "freq" and "asc"
>> +
>>   Example:
>>   
>>   asc1: serial@...0c00 {
>> @@ -14,3 +18,14 @@ asc1: serial@...0c00 {
>>   	interrupt-parent = <&icu0>;
>>   	interrupts = <112 113 114>;
>>   };
>> +
>> +asc0: serial@...000 {
>> +	compatible = "lantiq,asc";
>> +	reg = <0x600000 0x100000>;
> 1MB of address space? That wastes a lot of virtual space on 32-bit
> systems. Just make the size the actual used range.
The size of address space will be updated to the actual used range.
>> +	interrupt-parent = <&gic>;
>> +	interrupts = <GIC_SHARED 103 IRQ_TYPE_LEVEL_HIGH>,
>> +	<GIC_SHARED 105 IRQ_TYPE_LEVEL_HIGH>,
>> +	<GIC_SHARED 106 IRQ_TYPE_LEVEL_HIGH>;
>> +	clocks = <&pll0aclk SSX4_CLK>, <&clkgate1 GATE_URT_CLK>;
>> +	clock-names = "freq", "asc";
>> +};