Re: [PATCH v1 1/1] gpio: dwapb: clarify usage of the register file version
From: Serge Semin <hidden>
Date: 2021-12-01 12:27:43
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On Tue, Nov 30, 2021 at 06:49:56PM +0200, Andy Shevchenko wrote:
First of all, it's obvious that different versions can't be provided simultaneously. Hence, versions can't be bit masks. Second, due to above we have to mask out the version field in the flags and only that can be evaluated against the certain version. Clarify all above by: - introducing GPIO_REG_OFFSET_V1 and GPIO_REG_OFFSET_MASK - replacing conditional to mask out bits and compare to a version Luckily there is no functional change (at least intended), so no need to backport this.
Seems reasonable. Thanks. Acked-by: Serge Semin <redacted> -Sergey
quoted hunk ↗ jump to hunk
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- drivers/gpio/gpio-dwapb.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index f98fa33e1679..ec0767d7800d 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c@@ -53,7 +53,9 @@ #define GPIO_SWPORT_DR_STRIDE 0x0c /* register stride 3*32 bits */ #define GPIO_SWPORT_DDR_STRIDE 0x0c /* register stride 3*32 bits */ +#define GPIO_REG_OFFSET_V1 0 #define GPIO_REG_OFFSET_V2 1 +#define GPIO_REG_OFFSET_MASK BIT(0) #define GPIO_INTMASK_V2 0x44 #define GPIO_INTTYPE_LEVEL_V2 0x34@@ -141,7 +143,7 @@ static inline u32 gpio_reg_v2_convert(unsigned int offset) static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset) { - if (gpio->flags & GPIO_REG_OFFSET_V2) + if ((gpio->flags & GPIO_REG_OFFSET_MASK) == GPIO_REG_OFFSET_V2) return gpio_reg_v2_convert(offset); return offset;@@ -668,15 +670,15 @@ static int dwapb_get_clks(struct dwapb_gpio *gpio) } static const struct of_device_id dwapb_of_match[] = { - { .compatible = "snps,dw-apb-gpio", .data = (void *)0}, + { .compatible = "snps,dw-apb-gpio", .data = (void *)GPIO_REG_OFFSET_V1}, { .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2}, { /* Sentinel */ } }; MODULE_DEVICE_TABLE(of, dwapb_of_match); static const struct acpi_device_id dwapb_acpi_match[] = { - {"HISI0181", 0}, - {"APMC0D07", 0}, + {"HISI0181", GPIO_REG_OFFSET_V1}, + {"APMC0D07", GPIO_REG_OFFSET_V1}, {"APMC0D81", GPIO_REG_OFFSET_V2}, { } };-- 2.33.0