linux-kernel - Re: [PATCH] Add eSPI device driver (flash channel)

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Date: Wed, 14 Feb 2024 10:53:31 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Manojkiran Eda <manojkiran.eda@...il.com>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>,
 Andrew Jeffery <andrew@...econstruct.com.au>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 jk@...econstruct.com.au, Patrick Rudolph <patrick.rudolph@...ements.com>,
 Chia-Wei Wang <chiawei_wang@...eedtech.com>,
 Ryan Chen <ryan_chen@...eedtech.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 linux-mtd@...ts.infradead.org, openbmc@...ts.ozlabs.org,
 zev@...ilderbeest.net
Subject: Re: [PATCH] Add eSPI device driver (flash channel)

On 13/02/2024 15:36, Manojkiran Eda wrote:
> This patch adds the driver support for the eSPI controller of
> Aspeed 5/6th generation SoCs. This controller is a slave device
> communicating with a master over Enhanced Serial Peripheral
> Interface (eSPI).
> 
> eSPI supports 4 channels, namely peripheral, virtual wire,
> out-of-band, and flash, and operates at max frequency of 66MHz.
> 
> But at the moment, this patch set only supports the flash channel.
> 
> Signed-off-by: Manojkiran Eda <manojkiran.eda@...il.com>
> ---
> Hello everyone,
> 
> I'm presenting a revised version of the eSPI device driver patch series found at the following link:
> 
> https://lore.kernel.org/openbmc/20220516005412.4844-1-chiawei_wang@aspeedtech.com/ 

What changed? Please provide changelog and continue with versioning.


> 
> This update addresses the issues identified during the review process.
> 
> While the previous patch series attempted to incorporate support for all four different channels of eSPI,
> this new series focuses on upstreaming the flash channel initially, ensuring that all review comments are
> duly addressed, before progressing further.
> 
> Results:
> 
> Successfully conducted a flash update via eSPI.
> 
> Note:
> 
> This marks my inaugural endeavor in contributing code to the kernel subsystem. I kindly request reviewers
> to incorporate as many details as possible in the review comments.
> ---
>  .../devicetree/bindings/soc/aspeed/espi.yaml       | 125 ++++++
>  arch/arm/boot/dts/aspeed/aspeed-g6.dtsi            |  16 +-

These are all separatge patches.

Please run scripts/checkpatch.pl and fix reported warnings. Some
warnings can be ignored, but the code here looks like it needs a fix.
Feel free to get in touch if the warning is not clear.

>  drivers/mtd/mtdcore.c                              |   2 +-
>  drivers/soc/aspeed/Kconfig                         |  10 +
>  drivers/soc/aspeed/Makefile                        |   3 +
>  drivers/soc/aspeed/aspeed-espi-ctrl.c              | 197 +++++++++
>  drivers/soc/aspeed/aspeed-espi-ctrl.h              | 169 ++++++++
>  drivers/soc/aspeed/aspeed-espi-flash.c             | 466 +++++++++++++++++++++
>  drivers/soc/aspeed/aspeed-espi-flash.h             |  45 ++
>  include/uapi/linux/espi/aspeed-espi-ioc.h          | 103 +++++
>  10 files changed, 1134 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/soc/aspeed/espi.yaml b/Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> new file mode 100644
> index 000000000000..6521a351d18d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> @@ -0,0 +1,125 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# # Copyright (c) 2021 Aspeed Technology Inc.
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/soc/aspeed/espi.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"

It does not look like you tested the bindings, at least after quick
look. Please run `make dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).
Maybe you need to update your dtschema and yamllint.

Not reviewing further. Test your code....

Best regards,
Krzysztof