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mmc: exynos_dw_mmc: Refactor fixed CIU clock divider

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Some chips like Exynos4412 have fixed internal CIU clock divider.
Instead of reading it from non-standard "div" dts property, store its
value in the driver internally, in static chip data associated with
corresponding compatible. This makes it possible to avoid using
host->div for storing it, so the latter can be removed safely. Also
create a helper function called exynos_dwmmc_get_ciu_div() for getting
the current div value: in case the fixed div is provided in the chip
data it will be used, otherwise the current div value is being read from
CLKSEL register.

The insights for this change were taken from dw_mmc-exynos.c driver in
Linux kernel.

No functional change.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Sam Protsenko
2024-08-07 22:14:31 -05:00
committed by Minkyu Kang
parent a95b726e2e
commit 56ba9455a5
3 changed files with 30 additions and 17 deletions
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2
include/dwmmc.h
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@@ -184,7 +184,6 @@ struct dwmci_idmac_regs {
* @caps: Capabilities - see MMC_MODE_...
* @clock: Current clock frequency (after internal divider), Hz
* @bus_hz: Bus speed in Hz, if @get_mmc_clk() is NULL
* @div: Arbitrary clock divider value for use by controller
* @dev_index: Arbitrary device index for use by controller
* @dev_id: Arbitrary device ID for use by controller
* @buswidth: Bus width in bits (8 or 4)
@@ -205,7 +204,6 @@ struct dwmci_host {
unsigned int caps;
unsigned int clock;
unsigned int bus_hz;
unsigned int div;
int dev_index;
int dev_id;
int buswidth;