linux-kernel - Re: [PATCH RFC v2 4/4] riscv: dts: thead: Add clock to TH1520 mmc controllers

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Date: Thu, 2 May 2024 09:47:43 +0200
From: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
To: Drew Fustini <dfustini@...storrent.com>,
 Jisheng Zhang <jszhang@...nel.org>, Guo Ren <guoren@...nel.org>,
 Fu Wei <wefu@...hat.com>, Yangtao Li <frank.li@...o.com>,
 Emil Renner Berthing <emil.renner.berthing@...onical.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-riscv@...ts.infradead.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH RFC v2 4/4] riscv: dts: thead: Add clock to TH1520 mmc
 controllers



On 4/27/24 2:10 AM, Drew Fustini wrote:
> Change the clock property in the T-Head TH1520 mmc controller nodes to a
> real clock provided by the AP_SUBSYS clock driver.
> 
> Signed-off-by: Drew Fustini <dfustini@...storrent.com>

I experienced that, when the I2C clocks were correctly configured, the 
UART stopped working, likely due to their dependence on FOUTPOSTDIV.
Setting up the UART correctly, for instance:

                 uartx: serial@...xxxxxxx {
			...
                         clocks = <&clk CLK_UART_SCLK>, <&clk 
CLK_UARTX_PCLK>;
                         clock-names = "baudclk", "apb_pclk";
                         ...
			status = "disabled";
                 };
resolved the issue.
As this would be mandatory in the future, I suggest that you configure 
all the nodes currently set to a fixed clock, not just the MMC controller.

Thomas