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Message-ID: <8e3335dc-915c-4db2-8884-e16795e166de@linaro.org>
Date: Fri, 15 Dec 2023 08:58:42 +0100
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Subject: Re: [PATCH 04/13] dt-bindings: serial: samsung: gs101: make
 reg-io-width required property
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To: Tudor Ambarus <tudor.ambarus@linaro.org>, peter.griffin@linaro.org,
 robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
 mturquette@baylibre.com, sboyd@kernel.org, conor+dt@kernel.org,
 andi.shyti@kernel.org, alim.akhtar@samsung.com, gregkh@linuxfoundation.org,
 jirislaby@kernel.org, catalin.marinas@arm.com, will@kernel.org,
 s.nawrocki@samsung.com, tomasz.figa@gmail.com, cw00.choi@samsung.com,
 arnd@arndb.de, semen.protsenko@linaro.org
Cc: andre.draszik@linaro.org, saravanak@google.com, willmcvicker@google.com,
 linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org,
 linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org,
 linux-serial@vger.kernel.org
References: <20231214105243.3707730-1-tudor.ambarus@linaro.org>
 <20231214105243.3707730-5-tudor.ambarus@linaro.org>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20231214105243.3707730-5-tudor.ambarus@linaro.org>
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On 14/12/2023 11:52, Tudor Ambarus wrote:
> GS101 only allows 32-bit register accesses. When using 8-bit reg
> accesses on gs101, a SError Interrupt is raised causing the system
> unusable.
> 
> Make reg-io-width a required property and expect for it a value of 4.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> ---
>  Documentation/devicetree/bindings/serial/samsung_uart.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
> index 133259ed3a34..cc896d7e2a3d 100644
> --- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml
> +++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
> @@ -143,6 +143,10 @@ allOf:
>      then:
>        required:
>          - samsung,uart-fifosize
> +        - reg-io-width
> +      properties:
> +        reg-io-width:
> +          const: 4

If all your ports are like this, then I say this is compatible-specific.
Make it here "reg-io-width: false" and set in the driver proper type in
s3c24xx_serial_init_port_default() (or new function).

Although maybe let's first resolve discussion of next patch.

Best regards,
Krzysztof