[PATCHv2 3/3] spi: pxa2xx: Make LPSS SPI general register optional

[Jarkko Nikula <jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

General register located in LPSS SPI private register space is not found in
upcoming Intel LPSS platforms. Access it conditionally depending is it
defined in configuration.

Signed-off-by: Jarkko Nikula <jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/spi/spi-pxa2xx.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 3fec31dbf972..f97cd42fbc22 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -245,9 +245,13 @@ static void lpss_ssp_setup(struct driver_data *drv_data)
 	if (drv_data->master_info->enable_dma) {
 		__lpss_ssp_write_priv(drv_data, config->reg_ssp, 1);
 
-		value = __lpss_ssp_read_priv(drv_data, config->reg_general);
-		value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
-		__lpss_ssp_write_priv(drv_data, config->reg_general, value);
+		if (config->reg_general >= 0) {
+			value = __lpss_ssp_read_priv(drv_data,
+						     config->reg_general);
+			value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
+			__lpss_ssp_write_priv(drv_data,
+					      config->reg_general, value);
+		}
 	}
 }
 
-- 
2.1.4

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