linux-kernel - Re: [PATCH v2 2/3] dt-bindings: spi: constrain minItems of clocks and clock-names

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230713145724.GA3975811-robh@kernel.org>
Date:   Thu, 13 Jul 2023 08:57:24 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>,
        William Qiu <william.qiu@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v2 2/3] dt-bindings: spi: constrain minItems of clocks
 and clock-names

On Thu, Jul 13, 2023 at 02:39:19PM +0200, Krzysztof Kozlowski wrote:
> On 13/07/2023 14:28, Mark Brown wrote:
> > On Thu, Jul 13, 2023 at 05:00:14PM +0800, William Qiu wrote:
> > 
> >> The SPI controller only need apb_pclk clock to work properly on JH7110 SoC,
> >> so there add minItems whose value is equal to 1. Other platforms do not
> >> have this constraint.
> > 
> > Presumably this means that this is some variant of the usual pl022 IP,
> 
> Hm, in such case this could mean we need dedicated compatible.

Except the vendor in the ID registers should be different if the IP is 
modified.

I suspect that PCLK and SSPCLK are tied to the same clock source. There 
must be an SSPCLK because that is the one used to clock the SPI bus and 
we need to know the frequency of it.

Rob