linux-kernel - Re: [PATCH] arm64: dts: meson: fix g12a buses

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Date:   Sat, 19 Jan 2019 02:09:55 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Jerome Brunet <jbrunet@...libre.com>
CC:     Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Victor Wan <victor.wan@...ogic.com>
Subject: Re: [PATCH] arm64: dts: meson: fix g12a buses


Hi Martin and Jerome,

On 2019/1/18 5:20, Martin Blumenstingl wrote:
> On Thu, Jan 17, 2019 at 9:39 PM Jerome Brunet <jbrunet@...libre.com> wrote:
>>
>> On Thu, 2019-01-17 at 21:27 +0100, Martin Blumenstingl wrote:
>>> OK, but we had incorrect documentation in the past. did you check this
>>> with someone from Amlogic?
>>>
>>> I'm curious because there seem to be two different approaches here:
>>> 1) hiubus name and offsets are being fixed within this patch
>>> 2) aobus is being dropped here and re-introduced with a different name later
>>> on
>>>
>>
>> because hiu exist and aobus does not, for which both the name and size was
>> wrong
>>
>>> approach 1) can also be used for the "rti" region (at least in my
>>> opinion, the patch doesn't explain why it can't be done):
>>
>> THe patch remove aobus (instead of fixing name and size) because, of the
>> multiple region documented covered by this 'made region', I did not anticipate
>> which one will be required and I did not want to add them all.
>>
>> Better to add them as needed, which is want I done for pinctrl as you pointed
>> out
>>
>>> rename "aobus" to "rti" and change the size to either 0x1000 or 0xb000
>>> (both values can be found in mesong12a.dtsi from
>>> buildroot_openlinux_kernel_4.9_fbdev_20180706)
>>
>> RTI is added here:
>> https://lkml.kernel.org/r/20190117103151.3349-1-jbrunet@baylibre.com
>>
>> I don't really understand the problem ? result is the same
> the actual problem is "me" as I have conflicting information:
> - Amlogic's buildroot kernel (for G12A) uses similar bus definitions
> as the GX SoCs (for which there are public datasheets) - this is how
> Jianxin added it to meson-g12a.dtsi originally
> - this patch does it different - but cannot check if this is correct
> (no public datasheet is available for G12A or AXG) nor do I have a
> "big picture" of upcoming changes
> 
> Cc'ing Jianxin: can you please review Jerome's patch and give some
> more details on the memory map on G12A so further contributions can be
> reviewed easier?
> 
1. "aobus: bus@...00000" describes the following registers:
ahb	ao_reg	reserved	980	FF80B000
ahb	ao_reg	ao_mailbox	4	FF80A000
ahb	ao_reg	sar_adc		4	FF809000
ahb	ao_reg	ir_dec		4	FF808000
ahb	ao_reg	pwm_ab		4	FF807000
ahb	ao_reg	i2c_s		4	FF806000
ahb	ao_reg	i2c_m		4	FF805000
ahb	ao_reg	uart2		4	FF804000
ahb	ao_reg	uart		4	FF803000
ahb	ao_reg	pwm_cd		4	FF802000
ahb	ao_reg	reserved	4	FF801000
ahb	ao_reg	rti		4	FF800000


2. "cbus: bus@...00000" describes the following registers:
capb3	cbus	reserved	872	FFD26000	FFDFFFFF
capb3	cbus	sc		4	FFD25000	FFD25FFF
capb3	cbus	uart0		4	FFD24000	FFD24FFF
capb3	cbus	uart1		4	FFD23000	FFD23FFF
capb3	cbus	uart2		4	FFD22000	FFD22FFF
capb3	cbus	reserved	4	FFD21000	FFD21FFF
capb3	cbus	reserved	4	FFD20000	FFD20FFF
capb3	cbus	i2c_m0		4	FFD1F000	FFD1FFFF
capb3	cbus	i2c_m1		4	FFD1E000	FFD1EFFF
capb3	cbus	i2c_m2		4	FFD1D000	FFD1DFFF
capb3	cbus	i2c_m3		4	FFD1C000	FFD1CFFF
capb3	cbus	pwm_ab		4	FFD1B000	FFD1BFFF
capb3	cbus	pwm_cd		4	FFD1A000	FFD1AFFF
capb3	cbus	pwm_ef		4	FFD19000	FFD19FFF
capb3	cbus	msr_clk		4	FFD18000	FFD18FFF
capb3	cbus	reserved	4	FFD17000	FFD17FFF
capb3	cbus	reserved	4	FFD16000	FFD16FFF
capb3	cbus	spicc_1		4	FFD15000	FFD15FFF
capb3	cbus	spifc		4	FFD14000	FFD14FFF
capb3	cbus	spicc_0		4	FFD13000	FFD13FFF
capb3	cbus	reserved	4	FFD12000	FFD12FFF
capb3	cbus	reserved	4	FFD11000	FFD11FFF
capb3	cbus	reserved	4	FFD10000	FFD10FFF
capb3	cbus	isa		4	FFD0F000	FFD0FFFF
capb3	cbus	parser		4	FFD0E000	FFD0EFFF
capb3	cbus	reserved	4	FFD0D000	FFD0DFFF
capb3	cbus	sana		4	FFD0C000	FFD0CFFF
capb3	cbus	stream		4	FFD0B000	FFD0BFFF
capb3	cbus	async_fifo	4	FFD0A000	FFD0AFFF
capb3	cbus	async_fifo2	4	FFD09000	FFD09FFF
capb3	cbus	assist		4	FFD08000	FFD08FFF
capb3	cbus	mipi_dsi_host	4	FFD07000	FFD07FFF
capb3	cbus	stb		4	FFD06000	FFD06FFF
capb3	cbus	aififo		4	FFD05000	FFD05FFF
capb3	cbus	reserved	4	FFD04000	FFD04FFF
capb3	cbus	reserved	4	FFD03000	FFD03FFF
capb3	cbus	reserved	4	FFD02000	FFD02FFF
capb3	cbus	reset		4	FFD01000	FFD01FFF
capb3	cbus	reserved	4	FFD00000	FFD00FFF

3. In public data sheet, I can only found memory map about sub-regions of each bus. 
And no information about the bus itself.

> 
> Regards
> Martin
> 
> .
>