linux-kernel - Re: [PATCH v2 11/11] i2c: npcm: Support NPCM845

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Message-ID: <888977e0-03bb-3a6b-eca3-7fbf35f53ffc@canonical.com>
Date:   Sun, 20 Feb 2022 10:36:32 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Tyrone Ting <warp5tw@...il.com>, avifishman70@...il.com,
        tmaimon77@...il.com, tali.perry1@...il.com, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com, robh+dt@...nel.org,
        semen.protsenko@...aro.org, yangyicong@...ilicon.com,
        wsa@...nel.org, jie.deng@...el.com, sven@...npeter.dev,
        bence98@....bme.hu, christophe.leroy@...roup.eu,
        lukas.bulwahn@...il.com, olof@...om.net, arnd@...db.de,
        digetx@...il.com, andriy.shevchenko@...ux.intel.com,
        tali.perry@...oton.com, Avi.Fishman@...oton.com,
        tomer.maimon@...oton.com, KWLIU@...oton.com, JJLIU0@...oton.com,
        kfting@...oton.com
Cc:     openbmc@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/11] i2c: npcm: Support NPCM845

On 20/02/2022 04:53, Tyrone Ting wrote:
> From: Tyrone Ting <kfting@...oton.com>
> 
> Add NPCM8XX I2C support.
> The NPCM8XX uses a similar i2c module as NPCM7XX.
> The internal HW FIFO is larger in NPCM8XX.
> 
> Signed-off-by: Tyrone Ting <kfting@...oton.com>
> Signed-off-by: Tali Perry <tali.perry1@...il.com>
> ---
>  drivers/i2c/busses/Kconfig       |  8 +--
>  drivers/i2c/busses/Makefile      |  2 +-
>  drivers/i2c/busses/i2c-npcm7xx.c | 87 ++++++++++++++++++++++----------
>  3 files changed, 66 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 42da31c1ab70..ab9ee2de5e00 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -817,13 +817,13 @@ config I2C_NOMADIK
>  	  I2C interface from ST-Ericsson's Nomadik and Ux500 architectures,
>  	  as well as the STA2X11 PCIe I/O HUB.
>  
> -config I2C_NPCM7XX
> +config I2C_NPCM
>  	tristate "Nuvoton I2C Controller"
> -	depends on ARCH_NPCM7XX || COMPILE_TEST
> +	depends on ARCH_NPCM || COMPILE_TEST
>  	help
>  	  If you say yes to this option, support will be included for the
> -	  Nuvoton I2C controller, which is available on the NPCM7xx BMC
> -	  controller.
> +	  Nuvoton I2C controller, which is available on the NPCM BMC
> +	  controllers.
>  	  Driver can also support slave mode (select I2C_SLAVE).
>  
>  config I2C_OCORES
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 1d00dce77098..01fdf74a5565 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -80,7 +80,7 @@ obj-$(CONFIG_I2C_MT7621)	+= i2c-mt7621.o
>  obj-$(CONFIG_I2C_MV64XXX)	+= i2c-mv64xxx.o
>  obj-$(CONFIG_I2C_MXS)		+= i2c-mxs.o
>  obj-$(CONFIG_I2C_NOMADIK)	+= i2c-nomadik.o
> -obj-$(CONFIG_I2C_NPCM7XX)	+= i2c-npcm7xx.o
> +obj-$(CONFIG_I2C_NPCM)		+= i2c-npcm7xx.o
>  obj-$(CONFIG_I2C_OCORES)	+= i2c-ocores.o
>  obj-$(CONFIG_I2C_OMAP)		+= i2c-omap.o
>  obj-$(CONFIG_I2C_OWL)		+= i2c-owl.o
> diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
> index 2cbf9c679aed..b281e0424e3e 100644
> --- a/drivers/i2c/busses/i2c-npcm7xx.c
> +++ b/drivers/i2c/busses/i2c-npcm7xx.c
> @@ -17,6 +17,7 @@
>  #include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  
> @@ -91,7 +92,7 @@ enum i2c_addr {
>  
>  /* init register and default value required to enable module */
>  #define NPCM_I2CSEGCTL			0xE4
> -#define NPCM_I2CSEGCTL_INIT_VAL		0x0333F000
> +#define NPCM_I2CSEGCTL_INIT_VAL		bus->data->segctl_init_val
>  
>  /* Common regs */
>  #define NPCM_I2CSDA			0x00
> @@ -228,8 +229,7 @@ static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = {
>  #define NPCM_I2CFIF_CTS_CLR_FIFO	BIT(6)
>  #define NPCM_I2CFIF_CTS_SLVRSTR		BIT(7)
>  
> -/* NPCM_I2CTXF_CTL reg fields */
> -#define NPCM_I2CTXF_CTL_TX_THR		GENMASK(4, 0)
> +/* NPCM_I2CTXF_CTL reg field */
>  #define NPCM_I2CTXF_CTL_THR_TXIE	BIT(6)
>  
>  /* NPCM_I2CT_OUT reg fields */
> @@ -238,22 +238,22 @@ static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = {
>  #define NPCM_I2CT_OUT_T_OUTST		BIT(7)
>  
>  /* NPCM_I2CTXF_STS reg fields */
> -#define NPCM_I2CTXF_STS_TX_BYTES	GENMASK(4, 0)
> +#define NPCM_I2CTXF_STS_TX_BYTES	bus->data->txf_sts_tx_bytes

It's not a clean code to use defines for complex types. It's not a
constant anymore, so just use bus->data->txf_sts_tx_bytes directly.

The same in other places.

>  #define NPCM_I2CTXF_STS_TX_THST		BIT(6)
>  

Best regards,
Krzysztof