linux-kernel - Re: [PATCH 1/6] mfd: mt6397: extract irq related code from core driver

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Date:   Thu, 7 Feb 2019 09:08:30 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        srv_heupstream@...iatek.com
Subject: Re: [PATCH 1/6] mfd: mt6397: extract irq related code from core
 driver

On Wed, 30 Jan 2019, Hsin-Hsiung Wang wrote:

> In order to support different types of irq design,
> we decide to add separate irq drivers for different
> design and keep mt6397 mfd core simple and reusable
> to all generations of PMICs so far.

Why have you cut these lines so short?

In all cases:

 s/irq/IRQ/
 s/mfd/MFD
 s/mt6397/MT6397/

> Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
> ---
>  drivers/mfd/Makefile            |   2 +-
>  drivers/mfd/mt6397-core.c       | 235 +++++++---------------------------------
>  drivers/mfd/mt6397-irq.c        | 214 ++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/mt6397/core.h |  12 ++
>  4 files changed, 265 insertions(+), 198 deletions(-)
>  create mode 100644 drivers/mfd/mt6397-irq.c
> 
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 12980a4..088e249 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -230,7 +230,7 @@ obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
> -obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
> +obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o mt6397-irq.o
>  
>  obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
>  obj-$(CONFIG_MFD_SUN4I_GPADC)	+= sun4i-gpadc.o
> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> index 77b64bd..a72524d 100644
> --- a/drivers/mfd/mt6397-core.c
> +++ b/drivers/mfd/mt6397-core.c
> @@ -12,23 +12,19 @@
>   * GNU General Public License for more details.
>   */
>  
> -#include <linux/interrupt.h>
>  #include <linux/module.h>
>  #include <linux/of_device.h>
>  #include <linux/of_irq.h>
>  #include <linux/regmap.h>
>  #include <linux/mfd/core.h>

> -#include <linux/mfd/mt6397/core.h>
>  #include <linux/mfd/mt6323/core.h>
> -#include <linux/mfd/mt6397/registers.h>
> +#include <linux/mfd/mt6397/core.h>
>  #include <linux/mfd/mt6323/registers.h>
> +#include <linux/mfd/mt6397/registers.h>

I will ignore these unrelated changes!

>  #define MT6397_RTC_BASE		0xe000
>  #define MT6397_RTC_SIZE		0x3e
>  
> -#define MT6323_CID_CODE		0x23
> -#define MT6391_CID_CODE		0x91
> -#define MT6397_CID_CODE		0x97

CID_CODE is a bit cryptic.

Why not use *_CHIP_ID instead?

[...]

> +static const struct chip_data mt6323_core = {
> +	.cid_addr = MT6323_CID,
> +};

Does the chip ID address change from device to device?

If not, you can get rid of all of this hoop jumping.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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