linux-kernel - Re: [PATCH 04/13] dt-bindings: serial: samsung: gs101: make reg-io-width required property

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Date: Fri, 15 Dec 2023 08:58:42 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, peter.griffin@...aro.org,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 mturquette@...libre.com, sboyd@...nel.org, conor+dt@...nel.org,
 andi.shyti@...nel.org, alim.akhtar@...sung.com, gregkh@...uxfoundation.org,
 jirislaby@...nel.org, catalin.marinas@....com, will@...nel.org,
 s.nawrocki@...sung.com, tomasz.figa@...il.com, cw00.choi@...sung.com,
 arnd@...db.de, semen.protsenko@...aro.org
Cc: andre.draszik@...aro.org, saravanak@...gle.com, willmcvicker@...gle.com,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-serial@...r.kernel.org
Subject: Re: [PATCH 04/13] dt-bindings: serial: samsung: gs101: make
 reg-io-width required property

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@...aro.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