Re: [PATCH v2 03/10] clk: sunxi: Let divs clocks read the base factor clock name from devicetree

Jens Kuske
2015-05-18T10:07:15Z

On 05/17/15 15:06, Maxime Ripard wrote:
> On Fri, May 15, 2015 at 06:38:53PM +0200, Jens Kuske wrote:
>> Currently, the sunxi clock driver gets the name for the base factor clock
>> of divs clocks from the name field in factors_data. This prevents reusing
>> of the factor clock for clocks with same properties, but different name.
>>
>> This commit makes the divs setup function try to get a name from
>> clock-output-names in the devicetree. It also removes the name field where
>> possible and merges the sun4i PLL5 and PLL6 clocks.
>>
>> The sun4i PLL5 clock doesn't have a output for the base factor clock,
>> so we still have to use the name field there.
>>
>> Signed-off-by: Jens Kuske <jenskuske@gmail.com>
>> ---
>> drivers/clk/sunxi/clk-sunxi.c | 22 ++++++++++++----------
>> 1 file changed, 12 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
>> index 17cba4d..afe560c 100644
>> --- a/drivers/clk/sunxi/clk-sunxi.c
>> +++ b/drivers/clk/sunxi/clk-sunxi.c
>> @@ -708,18 +708,10 @@ static const struct factors_data sun4i_pll5_data __initconst = {
>> .name = "pll5",
>> };
>>
>> -static const struct factors_data sun4i_pll6_data __initconst = {
>> - .enable = 31,
>> - .table = &sun4i_pll5_config,
>> - .getter = sun4i_get_pll5_factors,
>> - .name = "pll6",
>> -};
>> -
>> static const struct factors_data sun6i_a31_pll6_data __initconst = {
>> .enable = 31,
>> .table = &sun6i_a31_pll6_config,
>> .getter = sun6i_a31_get_pll6_factors,
>> - .name = "pll6x2",
>> };
>>
>> static const struct factors_data sun5i_a13_ahb_data __initconst = {
>> @@ -1099,7 +1091,7 @@ static const struct divs_data pll5_divs_data __initconst = {
>> };
>>
>> static const struct divs_data pll6_divs_data __initconst = {
>> - .factors = &sun4i_pll6_data,
>> + .factors = &sun4i_pll5_data,
>> .ndivs = 4,
>> .div = {
>> { .shift = 0, .table = pll6_sata_tbl, .gate = 14 }, /* M, SATA */
>> @@ -1141,6 +1133,7 @@ static void __init sunxi_divs_clk_setup(struct device_node *node,
>> struct clk_gate *gate = NULL;
>> struct clk_fixed_factor *fix_factor;
>> struct clk_divider *divider;
>> + struct factors_data factors = *data->factors;
>> void __iomem *reg;
>> int ndivs = SUNXI_DIVS_MAX_QTY, i = 0;
>> int flags, clkflags;
>> @@ -1149,8 +1142,17 @@ static void __init sunxi_divs_clk_setup(struct device_node *node,
>> if (data->ndivs)
>> ndivs = data->ndivs;
>>
>> + /* Try to find a name for base factor clock */
>> + for (i = 0; i < ndivs; i++) {
>> + if (data->div[i].self) {
>
> I'm not sure we should expect the factor clock to have a self factor.

Maybe not, but in that case it would fall back to the name provided in
the factors_data struct, as it is the case for sun4i pll5.

> what about taking the first output and taking the substring up to the
> first "_" ?

That only works for the sun[457]i pll5 & pll6, for sun[68]i the base
clock name would have to be "pll6x2".

Jens