spi: meson-spicc: add min sclk for each compatible

The G12A SPICC controller variant takes the source clock from a specific
clock instead of the bus clock.
The minimal clock calculus won't work with the G12A support, thus add the
minimal supported clock for each variant and pass this to the SPI core.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20200312133131.26430-6-narmstrong@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c
index 710b4e7..b5bd3a8 100644 (file)
--- a/drivers/spi/spi-meson-spicc.c
+++ b/drivers/spi/spi-meson-spicc.c
@@ -132,6 +132,7 @@
 
 struct meson_spicc_data {
        unsigned int                    max_speed_hz;
+       unsigned int                    min_speed_hz;
        bool                            has_oen;
        bool                            has_enhance_clk_div;
 };
@@ -685,7 +686,7 @@ static int meson_spicc_probe(struct platform_device *pdev)
                                     SPI_BPW_MASK(16) |
                                     SPI_BPW_MASK(8);
        master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX);
-       master->min_speed_hz = rate >> 9;
+       master->min_speed_hz = spicc->data->min_speed_hz;
        master->setup = meson_spicc_setup;
        master->cleanup = meson_spicc_cleanup;
        master->prepare_message = meson_spicc_prepare_message;
@@ -736,10 +737,12 @@ static int meson_spicc_remove(struct platform_device *pdev)
 
 static const struct meson_spicc_data meson_spicc_gx_data = {
        .max_speed_hz           = 30000000,
+       .min_speed_hz           = 325000,
 };
 
 static const struct meson_spicc_data meson_spicc_axg_data = {
        .max_speed_hz           = 80000000,
+       .min_speed_hz           = 325000,
        .has_oen                = true,
        .has_enhance_clk_div    = true,
 };