linux-kernel - Re: [PATCH v2 11/11] can: tcan4x5x: Specify separate read/write ranges

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Message-ID: <20221206162001.3cgtod46h5d5j7fx@pengutronix.de>
Date:   Tue, 6 Dec 2022 17:20:01 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Markus Schneider-Pargmann <msp@...libre.com>
Cc:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/11] can: tcan4x5x: Specify separate read/write
 ranges

On 06.12.2022 12:57:28, Markus Schneider-Pargmann wrote:
> Specify exactly which registers are read/writeable in the chip. This
> is supposed to help detect any violations in the future.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> ---
>  drivers/net/can/m_can/tcan4x5x-regmap.c | 43 +++++++++++++++++++++----
>  1 file changed, 37 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c
> index 33aed989e42a..2b218ce04e9f 100644
> --- a/drivers/net/can/m_can/tcan4x5x-regmap.c
> +++ b/drivers/net/can/m_can/tcan4x5x-regmap.c
> @@ -90,16 +90,47 @@ static int tcan4x5x_regmap_read(void *context,
>  	return 0;
>  }
>  
> -static const struct regmap_range tcan4x5x_reg_table_yes_range[] = {
> +static const struct regmap_range tcan4x5x_reg_table_wr_range[] = {
> +	/* Device ID and SPI Registers */
> +	regmap_reg_range(0x000c, 0x0010),

According to "Table 8-8" 0xc is RO, but in "8.6.1.4 Status (address =
h000C) [reset = h0000000U]" it clearly says it has write 1 to clear bits
:/.

> +	/* Device configuration registers and Interrupt Flags*/
> +	regmap_reg_range(0x0800, 0x080c),
> +	regmap_reg_range(0x0814, 0x0814),

0x814 is marked as reserved in "SLLSEZ5D – JANUARY 2018 – REVISED JUNE
2022"?

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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