linux-kernel - Re: [PATCH v2 2/2] clk: mediatek: add infracfg reset controller for mt7988

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Date: Mon, 8 Jan 2024 15:24:09 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: frank-w@...lic-files.de, Frank Wunderlich <linux@...web.de>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Sam Shih <sam.shih@...iatek.com>, Daniel Golle <daniel@...rotopia.org>,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] clk: mediatek: add infracfg reset controller for
 mt7988

Il 08/01/24 14:46, Frank Wunderlich ha scritto:
> Am 8. Januar 2024 11:12:26 MEZ schrieb AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>:
>> Il 05/01/24 17:20, Frank Wunderlich ha scritto:
>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>>
>>> Infracfg can also operate as reset controller, add support for it.
>>>
>>> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
>>> ---
>>>    drivers/clk/mediatek/clk-mt7988-infracfg.c | 20 ++++++++++++++++++++
>>>    1 file changed, 20 insertions(+)
>>>
>>> diff --git a/drivers/clk/mediatek/clk-mt7988-infracfg.c b/drivers/clk/mediatek/clk-mt7988-infracfg.c
>>> index 8011ef278bea..1660a45349ff 100644
>>> --- a/drivers/clk/mediatek/clk-mt7988-infracfg.c
>>> +++ b/drivers/clk/mediatek/clk-mt7988-infracfg.c
>>> @@ -14,6 +14,9 @@
>>>    #include "clk-gate.h"
>>>    #include "clk-mux.h"
>>>    #include <dt-bindings/clock/mediatek,mt7988-clk.h>
>>> +#include <dt-bindings/reset/mediatek,mt7988-resets.h>
>>> +
>>> +#define	INFRA_RST_SET_OFFSET	0x80
>>>      static DEFINE_SPINLOCK(mt7988_clk_lock);
>>>    @@ -249,12 +252,29 @@ static const struct mtk_gate infra_clks[] = {
>>>    	GATE_INFRA3(CLK_INFRA_133M_PCIE_CK_P3, "infra_133m_pcie_ck_p3", "sysaxi_sel", 31),
>>>    };
>>>    +static u16 infra_rst_ofs[] = {
>>> +	INFRA_RST_SET_OFFSET,
>>> +};
>>> +
>>> +static u16 infra_idx_map[] = {
>>> +	[MT7988_INFRA_RST0_THERM_CTRL_SWRST] = 0 * RST_NR_PER_BANK + 9,
>>
>> The MT7988A datasheet says that INFRA_RST0 bit 9 is CONN2EMI_M0_GALS_SLV_SWRST, so
>> this is wrong: THERM_CTRL_SWRST is in the RST1 register, bit 9.
>>
>> Also, I'm sure that you really want to add the PCIe MAC reset bit as well, to be
>> used with the PCIe driver...
>>
>> [MT7988_INFRA_RST0_PEXTP_MAC_SWRST] = 0 * RST_NR_PER_BANK + 6,
>> [MT7988_INFRA_RST1_THERM_CTRL_SWRST] = 1 * RST_NR_PER_BANK + 9,
> 
> Yes you are right...i have only rst1 as screenshot,need to get the full datasheet or can you tell me base address for rst0? Need to change value of INFRA_RST_SET_OFFSET then to rst0 and check RST_NR_PER_BANK to be correct.

The datasheet is public ... [1] has it in the Resources paragraph :-)

Anyway, since I already have it here in front of me...

10001070 INFRA_GLOBALCON_RST0_SET
10001080 INFRA_GLOBALCON_RST1_SET

[1]: https://wiki.banana-pi.org/Banana_Pi_BPI-R4

Cheers,
Angelo