linux-kernel - Re: [PATCH 4/8] clk: sunxi-ng: Add support for the Allwinner H616 R-CCU

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Date:   Wed, 2 Dec 2020 20:44:29 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Jernej Škrabec <jernej.skrabec@...l.net>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-sunxi@...glegroups.com, Rob Herring <robh+dt@...nel.org>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Yangtao Li <frank@...winnertech.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/8] clk: sunxi-ng: Add support for the Allwinner H616
 R-CCU

On 12/2/20 12:20 PM, Jernej Škrabec wrote:
>> +};
>> +
>> +static struct clk_hw_onecell_data sun50i_h616_r_hw_clks = {
>> +	.hws	= {
>> +		[CLK_R_AHB]		= &r_ahb_clk.hw,
>> +		[CLK_R_APB1]		= &r_apb1_clk.common.hw,
>> +		[CLK_R_APB2]		= &r_apb2_clk.common.hw,
>> +		[CLK_R_APB1_TWD]	= &r_apb1_twd_clk.common.hw,
> 
> Do we know if TWD exists? I tested I2C and IR. What is your source for these 
> clocks?

Looking at https://github.com/orangepi-xunlong/linux-orangepi and comparing
drivers/clk/sunxi/clk-sun50iw[69].h, I see:

 /* PRCM Register List */
 #define CPUS_CFG            0x0000
 #define CPUS_APBS1_CFG      0x000C
 #define CPUS_APBS2_CFG      0x0010
-#define CPUS_TIMER_GATE     0x011C
 #define CPUS_TWDOG_GATE     0x012C
-#define CPUS_PWM_GATE       0x013C
-#define CPUS_UART_GATE      0x018C
 #define CPUS_TWI_GATE       0x019C
 #define CPUS_RSB_GATE       0x01BC
 #define CPUS_CIR_CFG        0x01C0
 #define CPUS_CIR_GATE       0x01CC
 #define CPUS_OWC_CFG        0x01E0
 #define CPUS_OWC_GATE       0x01EC
 #define CPUS_RTC_GATE       0x020C
 #define CPUS_CLK_MAX_REG    0x020C

which suggests that TWD is still there, along with OWC/W1 and an undocumented
RSB controller like the one in H6. Jernej, can you check RSB? It should be
PL0/PL1 function 2 and MMIO base 0x7083000.

Cheers,
Samuel