linux-kernel - Re: [PATCH v3 04/12] tty: serial: samsung: prepare for different IO types

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Date: Wed, 10 Jan 2024 09:07:02 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, peter.griffin@...aro.org,
 krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org
Cc: mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
 conor+dt@...nel.org, andi.shyti@...nel.org, alim.akhtar@...sung.com,
 jirislaby@...nel.org, s.nawrocki@...sung.com, tomasz.figa@...il.com,
 cw00.choi@...sung.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,
 andre.draszik@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v3 04/12] tty: serial: samsung: prepare for different IO
 types

On 09/01/2024 13:58, Tudor Ambarus wrote:
> GS101's Connectivity Peripheral blocks (peric0/1 blocks) which
> include the I3C and USI (I2C, SPI, UART) only allow 32-bit
> register accesses. If using 8-bit register accesses, a SError
> Interrupt is raised causing the system unusable.
> 
> Instead of specifying the reg-io-width = 4 everywhere, for each node,
> the requirement should be deduced from the compatible.
> 
> Prepare the samsung tty driver to allow IO types different than
> UPIO_MEM. ``struct uart_port::iotype`` is an unsigned char where all
> its 8 bits are exposed to uapi. We can't make NULL checks on it to
> verify if it's set, thus always set it from the driver's data.
> Use u8 for the ``iotype`` member of ``struct s3c24xx_uart_info`` to
> emphasize that the iotype is an 8 bit mask.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof