clk: exynos4: Fix wrong clock for Exynos4x12 ADC

commit e323d56eb06b266b77c2b430cb5f1977ba549e03 upstream.

The TSADC gate clock was used in Exynos4x12 DTSI for exynos-adc driver.
However TSADC is present only on Exynos4210 so on Trats2 board (with
Exynos4412 SoC) the exynos-adc driver could not be probed:
   ERROR: could not get clock /adc@126C0000:adc(0)
   exynos-adc 126c0000.adc: failed getting clock, err = -2
   exynos-adc: probe of 126c0000.adc failed with error -2

Instead on Exynos4x12 SoCs the main clock used by Analog to Digital
Converter is located in different register and it is named in datasheet
as PCLK_ADC. Regardless of the name the purpose of this PCLK_ADC clock
is the same as purpose of TSADC from Exynos4210.

The patch adds gate clock for Exynos4x12 using the proper register so
backward compatibility is preserved. This fixes the probe of exynos-adc
driver on Exynos4x12 boards and allows accessing sensors connected to it
on Trats2 board (ntc,ncp15wb473 AP and battery thermistors).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: c63c57433003 ("ARM: dts: Add ADC's dt data to read raw data for exynos4x12")
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Acked-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c
index 714d6ba782c81b2420c7770db183a3b6b1ffd785..f7890bf652e6915bf82f6a6fb5b40c0a428eda9a 100644 (file)
--- a/drivers/clk/samsung/clk-exynos4.c
+++ b/drivers/clk/samsung/clk-exynos4.c
@@ -85,6 +85,7 @@
 #define DIV_PERIL4             0xc560
 #define DIV_PERIL5             0xc564
 #define E4X12_DIV_CAM1         0xc568
+#define E4X12_GATE_BUS_FSYS1   0xc744
 #define GATE_SCLK_CAM          0xc820
 #define GATE_IP_CAM            0xc920
 #define GATE_IP_TV             0xc924
@@ -1095,6 +1096,7 @@ static struct samsung_gate_clock exynos4x12_gate_clks[] __initdata = {
                0),
        GATE(CLK_PPMUIMAGE, "ppmuimage", "aclk200", E4X12_GATE_IP_IMAGE, 9, 0,
                0),
+       GATE(CLK_TSADC, "tsadc", "aclk133", E4X12_GATE_BUS_FSYS1, 16, 0, 0),
        GATE(CLK_MIPI_HSI, "mipi_hsi", "aclk133", GATE_IP_FSYS, 10, 0, 0),
        GATE(CLK_CHIPID, "chipid", "aclk100", E4X12_GATE_IP_PERIR, 0, 0, 0),
        GATE(CLK_SYSREG, "sysreg", "aclk100", E4X12_GATE_IP_PERIR, 1,