[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <fb85c288-2ea9-3343-ff19-cd58940b44ec@linaro.org>
Date: Tue, 15 Aug 2023 21:19:34 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Hsin-Yi Wang <hsinyi@...omium.org>,
Michael Walle <michael@...le.cc>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Bjorn Andersson <andersson@...nel.org>,
Pratyush Yadav <pratyush@...nel.org>,
"Miquel Raynal )" <miquel.raynal@...tlin.com>,
"Richard Weinberger )" <richard@....at>,
"Vignesh Raghavendra )" <vigneshr@...com>,
Rob Herring <robh+dt@...nel.org>,
linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
cros-qcom-dts-watchers@...omium.org,
Andy Gross <agross@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH 0/4] Add a property to override the quad mode
On 15/08/2023 19:21, Hsin-Yi Wang wrote:
> On Tue, Aug 15, 2023 at 11:59 PM Michael Walle <michael@...le.cc> wrote:
>>
>> Hi,
>>
>>> On gigadevice gd25lq64c, the quad mode is enabled after BFPT is parsed.
>>> According to datasheet[1], Quad enable (QE) bit needs to be set to 0 to
>>> use write protection (WP) pin. It also recommends setting default value of
>>> QE to 0 to avoid a potential short issue.
>>
>> So you are using either dual or single io mode. Why can't you use the device tree property spi-{tx,rx}-bus-width?
>
> I tried setting spi-tx-bus-width and spi-rx-bus-width to either 0 or 1
> and WP still doesn't work.
> For this chip, quad_enable will be set to spi_nor_sr2_bit1_quad_enable
> (QER flag is BFPT_DWORD15_QER_SR2_BIT1_BUGGY)[1]
>
> spi_nor_write_sr_and_check() calls
> spi_nor_write_16bit_sr_and_check()[2] and the function sets QE bit if
> quad_enable is not NULL.
>
> [1] https://elixir.bootlin.com/linux/latest/source/drivers/mtd/spi-nor/sfdp.c#L575
> [2] https://elixir.bootlin.com/linux/latest/source/drivers/mtd/spi-nor/core.c#L879
>
> Setting spi-{tx,rx}-bus-width still falls to this function and cases.
with tx/rx bus width = 2, how quad mode is still possible? IOW, why do
you need new property? You wrote here about driver, but I ask about
bindings.
Best regards,
Krzysztof
Powered by blists - more mailing lists